Merging upstream version 1.29.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

73 files changed, 1495 insertions, 11997 deletions

diff --git a/libnetdata/Makefile.am b/libnetdata/Makefile.am
index d239d4b01..598b72f5b 100644
--- a/libnetdata/Makefile.am
+++ b/libnetdata/Makefile.am
@@ -10,6 +10,7 @@ SUBDIRS = \
     clocks \
     config \
     dictionary \
+    ebpf \
     eval \
     json \
     health \
diff --git a/libnetdata/Makefile.in b/libnetdata/Makefile.in
deleted file mode 100644
index ce61281b9..000000000
--- a/libnetdata/Makefile.in
+++ /dev/null
@@ -1,722 +0,0 @@
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diff --git a/libnetdata/README.md b/libnetdata/README.md
index 8610cfd11..cdb199f51 100644
--- a/libnetdata/README.md
+++ b/libnetdata/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "libnetdata"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/README.md
+-->
+
 # libnetdata
 
 `libnetdata` is a collection of library code that is used by all Netdata `C` programs.
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diff --git a/libnetdata/adaptive_resortable_list/README.md b/libnetdata/adaptive_resortable_list/README.md
index 0bb99b81c..74e379a92 100644
--- a/libnetdata/adaptive_resortable_list/README.md
+++ b/libnetdata/adaptive_resortable_list/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Adaptive Re-sortable List (ARL)"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/adaptive_resortable_list/README.md
+-->
+
 # Adaptive Re-sortable List (ARL)
 
 This library allows Netdata to read a series of `name - value` pairs
@@ -84,7 +89,7 @@ Compared to unoptimized code (test No 1: 4.6sec):
 -   before ARL Netdata was using test No **7** with hashing and a custom `str2ull()` to achieve 602ms.
 -   the current ARL implementation is test No **9** that needs only 157ms (29 times faster vs unoptimized code, about 4 times faster vs optimized code).
 
-[Check the source code of this test](../../tests/profile/benchmark-value-pairs.c).
+[Check the source code of this test](https://raw.githubusercontent.com/netdata/netdata/master/tests/profile/benchmark-value-pairs.c).
 
 ## Limitations
 
diff --git a/libnetdata/avl/Makefile.in b/libnetdata/avl/Makefile.in
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diff --git a/libnetdata/avl/README.md b/libnetdata/avl/README.md
index 6a96884ae..2097be57f 100644
--- a/libnetdata/avl/README.md
+++ b/libnetdata/avl/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "AVL"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/avl/README.md
+-->
+
 # AVL
 
 AVL is a library indexing objects in B-Trees.
diff --git a/libnetdata/avl/avl.c b/libnetdata/avl/avl.c
index c44bef307..521985189 100644
--- a/libnetdata/avl/avl.c
+++ b/libnetdata/avl/avl.c
@@ -17,7 +17,7 @@
 
 /* Search |tree| for an item matching |item|, and return it if found.
      Otherwise return |NULL|. */
-avl *avl_search(avl_tree *tree, avl *item) {
+avl *avl_search(avl_tree_type *tree, avl *item) {
     avl *p;
 
     // assert (tree != NULL && item != NULL);
@@ -40,7 +40,7 @@ avl *avl_search(avl_tree *tree, avl *item) {
      If a duplicate item is found in the tree,
      returns a pointer to the duplicate without inserting |item|.
  */
-avl *avl_insert(avl_tree *tree, avl *item) {
+avl *avl_insert(avl_tree_type *tree, avl *item) {
     avl *y, *z; /* Top node to update balance factor, and parent. */
     avl *p, *q; /* Iterator, and parent. */
     avl *n;     /* Newly inserted node. */
@@ -136,7 +136,7 @@ avl *avl_insert(avl_tree *tree, avl *item) {
 
 /* Deletes from |tree| and returns an item matching |item|.
      Returns a null pointer if no matching item found. */
-avl *avl_remove(avl_tree *tree, avl *item) {
+avl *avl_remove(avl_tree_type *tree, avl *item) {
     /* Stack of nodes. */
     avl *pa[AVL_MAX_HEIGHT]; /* Nodes. */
     unsigned char da[AVL_MAX_HEIGHT];    /* |avl_link[]| indexes. */
@@ -306,7 +306,7 @@ int avl_walker(avl *node, int (*callback)(void * /*entry*/, void * /*data*/), vo
     return total;
 }
 
-int avl_traverse(avl_tree *tree, int (*callback)(void * /*entry*/, void * /*data*/), void *data) {
+int avl_traverse(avl_tree_type *tree, int (*callback)(void * /*entry*/, void * /*data*/), void *data) {
     if(tree->root)
         return avl_walker(tree->root, callback, data);
     else
@@ -367,6 +367,22 @@ void avl_init_lock(avl_tree_lock *tree, int (*compar)(void * /*a*/, void * /*b*/
 #endif /* AVL_WITHOUT_PTHREADS */
 }
 
+void avl_destroy_lock(avl_tree_lock *tree) {
+#ifndef AVL_WITHOUT_PTHREADS
+    int lock;
+
+#ifdef AVL_LOCK_WITH_MUTEX
+    lock = pthread_mutex_destroy(&tree->mutex);
+#else
+    lock = pthread_rwlock_destroy(&tree->rwlock);
+#endif
+
+    if(lock != 0)
+        fatal("Failed to destroy AVL mutex/rwlock, error: %d", lock);
+
+#endif /* AVL_WITHOUT_PTHREADS */
+}
+
 avl *avl_search_lock(avl_tree_lock *tree, avl *item) {
     avl_read_lock(tree);
     avl *ret = avl_search(&tree->avl_tree, item);
@@ -396,7 +412,7 @@ int avl_traverse_lock(avl_tree_lock *tree, int (*callback)(void * /*entry*/, voi
     return ret;
 }
 
-void avl_init(avl_tree *tree, int (*compar)(void * /*a*/, void * /*b*/)) {
+void avl_init(avl_tree_type *tree, int (*compar)(void * /*a*/, void * /*b*/)) {
     tree->root = NULL;
     tree->compar = compar;
 }
diff --git a/libnetdata/avl/avl.h b/libnetdata/avl/avl.h
index 070bb3d3d..32e3f27a8 100644
--- a/libnetdata/avl/avl.h
+++ b/libnetdata/avl/avl.h
@@ -34,13 +34,13 @@ typedef struct avl {
 } avl;
 
 /* An AVL tree */
-typedef struct avl_tree {
+typedef struct avl_tree_type {
     avl *root;
     int (*compar)(void *a, void *b);
-} avl_tree;
+} avl_tree_type;
 
 typedef struct avl_tree_lock {
-    avl_tree avl_tree;
+    avl_tree_type avl_tree;
 
 #ifndef AVL_WITHOUT_PTHREADS
 #ifdef AVL_LOCK_WITH_MUTEX
@@ -60,7 +60,7 @@ typedef struct avl_tree_lock {
  * be properly allocated by the caller.
  */
 avl *avl_insert_lock(avl_tree_lock *tree, avl *item) NEVERNULL WARNUNUSED;
-avl *avl_insert(avl_tree *tree, avl *item) NEVERNULL WARNUNUSED;
+avl *avl_insert(avl_tree_type *tree, avl *item) NEVERNULL WARNUNUSED;
 
 /* Remove an element a from the AVL tree t
  * returns a pointer to the removed element
@@ -68,22 +68,25 @@ avl *avl_insert(avl_tree *tree, avl *item) NEVERNULL WARNUNUSED;
  * (equal as returned by t->compar())
  */
 avl *avl_remove_lock(avl_tree_lock *tree, avl *item) WARNUNUSED;
-avl *avl_remove(avl_tree *tree, avl *item) WARNUNUSED;
+avl *avl_remove(avl_tree_type *tree, avl *item) WARNUNUSED;
 
 /* Find the element into the tree that equal to a
  * (equal as returned by t->compar())
  * returns NULL is no element is equal to a
  */
 avl *avl_search_lock(avl_tree_lock *tree, avl *item);
-avl *avl_search(avl_tree *tree, avl *item);
+avl *avl_search(avl_tree_type *tree, avl *item);
 
 /* Initialize the avl_tree_lock
  */
 void avl_init_lock(avl_tree_lock *tree, int (*compar)(void *a, void *b));
-void avl_init(avl_tree *tree, int (*compar)(void *a, void *b));
+void avl_init(avl_tree_type *tree, int (*compar)(void *a, void *b));
 
+/* Destroy the avl_tree_lock locks
+ */
+void avl_destroy_lock(avl_tree_lock *tree);
 
 int avl_traverse_lock(avl_tree_lock *tree, int (*callback)(void *entry, void *data), void *data);
-int avl_traverse(avl_tree *tree, int (*callback)(void *entry, void *data), void *data);
+int avl_traverse(avl_tree_type *tree, int (*callback)(void *entry, void *data), void *data);
 
 #endif /* avl.h */
diff --git a/libnetdata/buffer/Makefile.in b/libnetdata/buffer/Makefile.in
deleted file mode 100644
index d0d4597ce..000000000
--- a/libnetdata/buffer/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
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-    $(NULL)
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-	      exit 1;; \
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diff --git a/libnetdata/buffer/README.md b/libnetdata/buffer/README.md
index c89889c2a..5a9d7b023 100644
--- a/libnetdata/buffer/README.md
+++ b/libnetdata/buffer/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "BUFFER"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/buffer/README.md
+-->
+
 # BUFFER
 
 `BUFFER` is a convenience library for working with strings in `C`.
diff --git a/libnetdata/buffer/buffer.c b/libnetdata/buffer/buffer.c
index 50672324b..c37da21e1 100644
--- a/libnetdata/buffer/buffer.c
+++ b/libnetdata/buffer/buffer.c
@@ -160,6 +160,31 @@ void buffer_strcat(BUFFER *wb, const char *txt)
     }
 }
 
+void buffer_strcat_jsonescape(BUFFER *wb, const char *txt)
+{
+    while(*txt) {
+        switch(*txt) {
+            case '\\':
+                buffer_need_bytes(wb, 2);
+                wb->buffer[wb->len++] = '\\';
+                wb->buffer[wb->len++] = '\\';
+                break;
+            case '"':
+                buffer_need_bytes(wb, 2);
+                wb->buffer[wb->len++] = '\\';
+                wb->buffer[wb->len++] = '"';
+                break;
+            default: {
+                buffer_need_bytes(wb, 1);
+                wb->buffer[wb->len++] = *txt;
+            }
+        }
+        txt++;
+    }
+
+    buffer_overflow_check(wb);
+}
+
 void buffer_strcat_htmlescape(BUFFER *wb, const char *txt)
 {
     while(*txt) {
diff --git a/libnetdata/buffer/buffer.h b/libnetdata/buffer/buffer.h
index 8e431bfd5..d50910c51 100644
--- a/libnetdata/buffer/buffer.h
+++ b/libnetdata/buffer/buffer.h
@@ -67,6 +67,7 @@ extern void buffer_increase(BUFFER *b, size_t free_size_required);
 extern void buffer_snprintf(BUFFER *wb, size_t len, const char *fmt, ...) PRINTFLIKE(3, 4);
 extern void buffer_vsprintf(BUFFER *wb, const char *fmt, va_list args);
 extern void buffer_sprintf(BUFFER *wb, const char *fmt, ...) PRINTFLIKE(2,3);
+extern void buffer_strcat_jsonescape(BUFFER *wb, const char *txt);
 extern void buffer_strcat_htmlescape(BUFFER *wb, const char *txt);
 
 extern void buffer_char_replace(BUFFER *wb, char from, char to);
diff --git a/libnetdata/circular_buffer/Makefile.am b/libnetdata/circular_buffer/Makefile.am
new file mode 100644
index 000000000..161784b8f
--- /dev/null
+++ b/libnetdata/circular_buffer/Makefile.am
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+    README.md \
+    $(NULL)
diff --git a/libnetdata/circular_buffer/README.md b/libnetdata/circular_buffer/README.md
new file mode 100644
index 000000000..d36c05f5a
--- /dev/null
+++ b/libnetdata/circular_buffer/README.md
@@ -0,0 +1,12 @@
+<!--
+title: "circular_buffer"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/circular_buffer/README.md
+-->
+
+# Circular Buffer
+
+`struct circular_buffer` is an adaptive circular buffer. It will start at an initial size
+and grow up to a maximum size as it fills. Two indices within the structure track the current
+`read` and `write` position for data.
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Flibnetdata%2Fcircular_buffer%2README&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/libnetdata/circular_buffer/circular_buffer.c b/libnetdata/circular_buffer/circular_buffer.c
new file mode 100644
index 000000000..998008db2
--- /dev/null
+++ b/libnetdata/circular_buffer/circular_buffer.c
@@ -0,0 +1,85 @@
+#include "../libnetdata.h"
+
+struct circular_buffer *cbuffer_new(size_t initial, size_t max) {
+    struct circular_buffer *result = mallocz(sizeof(*result));
+    result->size = initial;
+    result->data = mallocz(initial);
+    result->write = 0;
+    result->read = 0;
+    result->max_size = max;
+    return result;
+}
+
+void cbuffer_free(struct circular_buffer *buf) {
+    freez(buf->data);
+    freez(buf);
+}
+
+static int cbuffer_realloc_unsafe(struct circular_buffer *buf) {
+    // Check that we can grow
+    if (buf->size >= buf->max_size)
+        return 1;
+    size_t new_size = buf->size * 2;
+    if (new_size > buf->max_size)
+        new_size = buf->max_size;
+
+    // We know that: size < new_size <= max_size
+    // For simplicity align the current data at the bottom of the new buffer
+    char *new_data = mallocz(new_size);
+    if (buf->read == buf->write)
+        buf->write = 0; // buffer is empty
+    else if (buf->read < buf->write) {
+        memcpy(new_data, buf->data + buf->read, buf->write - buf->read);
+        buf->write -= buf->read;
+    } else {
+        size_t top_part = buf->size - buf->read;
+        memcpy(new_data, buf->data + buf->read, top_part);
+        memcpy(new_data + top_part, buf->data, buf->write);
+        buf->write = top_part + buf->write;
+    }
+    buf->read = 0;
+
+    // Switch buffers
+    freez(buf->data);
+    buf->data = new_data;
+    buf->size = new_size;
+    return 0;
+}
+
+int cbuffer_add_unsafe(struct circular_buffer *buf, const char *d, size_t d_len) {
+    size_t len = (buf->write >= buf->read) ? (buf->write - buf->read) : (buf->size - buf->read + buf->write);
+    while (d_len + len >= buf->size) {
+        if (cbuffer_realloc_unsafe(buf)) {
+            return 1;
+        }
+    }
+    // Guarantee: write + d_len cannot hit read
+    if (buf->write + d_len < buf->size) {
+        memcpy(buf->data + buf->write, d, d_len);
+        buf->write += d_len;
+    }
+    else {
+        size_t top_part = buf->size - buf->write;
+        memcpy(buf->data + buf->write, d, top_part);
+        memcpy(buf->data, d + top_part, d_len - top_part); 
+        buf->write = d_len - top_part;
+    }
+    return 0;
+}
+
+// Assume caller does not remove too many bytes (i.e. read will jump over write)
+void cbuffer_remove_unsafe(struct circular_buffer *buf, size_t num) {
+    buf->read += num;
+    // Assume num < size (i.e. caller cannot remove more bytes than are in the buffer)
+    if (buf->read >= buf->size)
+        buf->read -= buf->size;
+}
+
+size_t cbuffer_next_unsafe(struct circular_buffer *buf, char **start) {
+    if (start != NULL)
+      *start = buf->data + buf->read;
+    if (buf->read <= buf->write) {
+        return buf->write - buf->read;      // Includes empty case
+    }
+    return buf->size - buf->read;
+}
diff --git a/libnetdata/circular_buffer/circular_buffer.h b/libnetdata/circular_buffer/circular_buffer.h
new file mode 100644
index 000000000..ba37e0ebf
--- /dev/null
+++ b/libnetdata/circular_buffer/circular_buffer.h
@@ -0,0 +1,16 @@
+#ifndef CIRCULAR_BUFFER_H
+#define CIRCULAR_BUFFER_H 1
+
+#include <string.h>
+
+struct circular_buffer {
+    size_t size, write, read, max_size;
+    char *data;
+};
+
+extern struct circular_buffer *cbuffer_new(size_t initial, size_t max);
+extern void cbuffer_free(struct circular_buffer *buf);
+extern int cbuffer_add_unsafe(struct circular_buffer *buf, const char *d, size_t d_len);
+extern void cbuffer_remove_unsafe(struct circular_buffer *buf, size_t num);
+extern size_t cbuffer_next_unsafe(struct circular_buffer *buf, char **start);
+#endif
diff --git a/libnetdata/clocks/Makefile.in b/libnetdata/clocks/Makefile.in
deleted file mode 100644
index e3d9d3213..000000000
--- a/libnetdata/clocks/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
-# Makefile.in generated by automake 1.15.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994-2017 Free Software Foundation, Inc.
-
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-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
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-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
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diff --git a/libnetdata/clocks/clocks.c b/libnetdata/clocks/clocks.c
index 161225a9b..4ec5fa98b 100644
--- a/libnetdata/clocks/clocks.c
+++ b/libnetdata/clocks/clocks.c
@@ -3,6 +3,7 @@
 #include "../libnetdata.h"
 
 static int clock_boottime_valid = 1;
+static int clock_monotonic_coarse_valid = 1;
 
 #ifndef HAVE_CLOCK_GETTIME
 inline int clock_gettime(clockid_t clk_id, struct timespec *ts) {
@@ -23,6 +24,12 @@ void test_clock_boottime(void) {
         clock_boottime_valid = 0;
 }
 
+void test_clock_monotonic_coarse(void) {
+    struct timespec ts;
+    if(clock_gettime(CLOCK_MONOTONIC_COARSE, &ts) == -1 && errno == EINVAL)
+        clock_monotonic_coarse_valid = 0;
+}
+
 static inline time_t now_sec(clockid_t clk_id) {
     struct timespec ts;
     if(unlikely(clock_gettime(clk_id, &ts) == -1)) {
@@ -69,27 +76,43 @@ inline int now_realtime_timeval(struct timeval *tv) {
 }
 
 inline time_t now_monotonic_sec(void) {
-    return now_sec(CLOCK_MONOTONIC);
+    return now_sec(likely(clock_monotonic_coarse_valid) ? CLOCK_MONOTONIC_COARSE : CLOCK_MONOTONIC);
 }
 
 inline usec_t now_monotonic_usec(void) {
-    return now_usec(CLOCK_MONOTONIC);
+    return now_usec(likely(clock_monotonic_coarse_valid) ? CLOCK_MONOTONIC_COARSE : CLOCK_MONOTONIC);
 }
 
 inline int now_monotonic_timeval(struct timeval *tv) {
+    return now_timeval(likely(clock_monotonic_coarse_valid) ? CLOCK_MONOTONIC_COARSE : CLOCK_MONOTONIC, tv);
+}
+
+inline time_t now_monotonic_high_precision_sec(void) {
+    return now_sec(CLOCK_MONOTONIC);
+}
+
+inline usec_t now_monotonic_high_precision_usec(void) {
+    return now_usec(CLOCK_MONOTONIC);
+}
+
+inline int now_monotonic_high_precision_timeval(struct timeval *tv) {
     return now_timeval(CLOCK_MONOTONIC, tv);
 }
 
 inline time_t now_boottime_sec(void) {
-    return now_sec(likely(clock_boottime_valid) ? CLOCK_BOOTTIME : CLOCK_MONOTONIC);
+    return now_sec(likely(clock_boottime_valid) ? CLOCK_BOOTTIME :
+                   likely(clock_monotonic_coarse_valid) ? CLOCK_MONOTONIC_COARSE : CLOCK_MONOTONIC);
 }
 
 inline usec_t now_boottime_usec(void) {
-    return now_usec(likely(clock_boottime_valid) ? CLOCK_BOOTTIME : CLOCK_MONOTONIC);
+    return now_usec(likely(clock_boottime_valid) ? CLOCK_BOOTTIME :
+                    likely(clock_monotonic_coarse_valid) ? CLOCK_MONOTONIC_COARSE : CLOCK_MONOTONIC);
 }
 
 inline int now_boottime_timeval(struct timeval *tv) {
-    return now_timeval(likely(clock_boottime_valid) ? CLOCK_BOOTTIME : CLOCK_MONOTONIC, tv);
+    return now_timeval(likely(clock_boottime_valid) ? CLOCK_BOOTTIME :
+                       likely(clock_monotonic_coarse_valid) ? CLOCK_MONOTONIC_COARSE : CLOCK_MONOTONIC,
+                       tv);
 }
 
 inline usec_t timeval_usec(struct timeval *tv) {
diff --git a/libnetdata/clocks/clocks.h b/libnetdata/clocks/clocks.h
index 4af451d60..cfe99f5e7 100644
--- a/libnetdata/clocks/clocks.h
+++ b/libnetdata/clocks/clocks.h
@@ -36,6 +36,12 @@ typedef struct heartbeat {
 #define CLOCK_MONOTONIC CLOCK_REALTIME
 #endif
 
+/* Prefer CLOCK_MONOTONIC_COARSE where available to reduce overhead. It has the same semantics as CLOCK_MONOTONIC */
+#ifndef CLOCK_MONOTONIC_COARSE
+/* fallback to CLOCK_MONOTONIC if not available */
+#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
+#endif
+
 #ifndef CLOCK_BOOTTIME
 
 #ifdef CLOCK_UPTIME
@@ -43,7 +49,7 @@ typedef struct heartbeat {
 #define CLOCK_BOOTTIME CLOCK_UPTIME
 #else // CLOCK_UPTIME
 /* CLOCK_BOOTTIME falls back to CLOCK_MONOTONIC */
-#define CLOCK_BOOTTIME  CLOCK_MONOTONIC
+#define CLOCK_BOOTTIME  CLOCK_MONOTONIC_COARSE
 #endif // CLOCK_UPTIME
 
 #else // CLOCK_BOOTTIME
@@ -54,13 +60,23 @@ typedef struct heartbeat {
 
 #endif // CLOCK_BOOTTIME
 
+#ifndef NSEC_PER_MSEC
 #define NSEC_PER_MSEC   1000000ULL
+#endif
 
+#ifndef NSEC_PER_SEC
 #define NSEC_PER_SEC    1000000000ULL
+#endif
+#ifndef NSEC_PER_USEC
 #define NSEC_PER_USEC   1000ULL
+#endif
 
+#ifndef USEC_PER_SEC
 #define USEC_PER_SEC    1000000ULL
+#endif
+#ifndef MSEC_PER_SEC
 #define MSEC_PER_SEC    1000ULL
+#endif
 
 #define USEC_PER_MS     1000ULL
 
@@ -98,6 +114,9 @@ extern int clock_gettime(clockid_t clk_id, struct timespec *ts);
  *
  * All now_*_sec() functions return the time in seconds from the approriate clock, or 0 on error.
  * All now_*_usec() functions return the time in microseconds from the approriate clock, or 0 on error.
+ *
+ * Most functions will attempt to use CLOCK_MONOTONIC_COARSE if available to reduce contention overhead and improve
+ * performance scaling. If high precision is required please use one of the available now_*_high_precision_* functions.
  */
 extern int now_realtime_timeval(struct timeval *tv);
 extern time_t now_realtime_sec(void);
@@ -106,6 +125,9 @@ extern usec_t now_realtime_usec(void);
 extern int now_monotonic_timeval(struct timeval *tv);
 extern time_t now_monotonic_sec(void);
 extern usec_t now_monotonic_usec(void);
+extern int now_monotonic_high_precision_timeval(struct timeval *tv);
+extern time_t now_monotonic_high_precision_sec(void);
+extern usec_t now_monotonic_high_precision_usec(void);
 
 extern int now_boottime_timeval(struct timeval *tv);
 extern time_t now_boottime_sec(void);
@@ -136,6 +158,12 @@ extern int sleep_usec(usec_t usec);
  */
 void test_clock_boottime(void);
 
+/*
+ * When running a binary with CLOCK_MONOTONIC_COARSE defined on a system with a linux kernel older than Linux 2.6.32 the
+ * clock_gettime(2) system call fails with EINVAL. In that case it must fall-back to CLOCK_MONOTONIC.
+ */
+void test_clock_monotonic_coarse(void);
+
 extern collected_number uptime_msec(char *filename);
 
 #endif /* NETDATA_CLOCKS_H */
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deleted file mode 100644
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diff --git a/libnetdata/config/README.md b/libnetdata/config/README.md
index 51216b6db..a71f1ee18 100644
--- a/libnetdata/config/README.md
+++ b/libnetdata/config/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Netdata ini config files"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/config/README.md
+-->
+
 # Netdata ini config files
 
 Configuration files `netdata.conf` and `stream.conf` are Netdata ini files.
diff --git a/libnetdata/config/appconfig.c b/libnetdata/config/appconfig.c
index 65c36c281..d9dcde71a 100644
--- a/libnetdata/config/appconfig.c
+++ b/libnetdata/config/appconfig.c
@@ -2,63 +2,114 @@
 
 #include "../libnetdata.h"
 
-#define CONFIG_FILE_LINE_MAX ((CONFIG_MAX_NAME + CONFIG_MAX_VALUE + 1024) * 2)
-
-// ----------------------------------------------------------------------------
-// definitions
-
-#define CONFIG_VALUE_LOADED  0x01 // has been loaded from the config
-#define CONFIG_VALUE_USED    0x02 // has been accessed from the program
-#define CONFIG_VALUE_CHANGED 0x04 // has been changed from the loaded value or the internal default value
-#define CONFIG_VALUE_CHECKED 0x08 // has been checked if the value is different from the default
-
-struct config_option {
-    avl avl;                // the index entry of this entry - this has to be first!
-
-    uint8_t flags;
-    uint32_t hash;          // a simple hash to speed up searching
-                            // we first compare hashes, and only if the hashes are equal we do string comparisons
-
-    char *name;
-    char *value;
-
-    struct config_option *next; // config->mutex protects just this
-};
+/*
+ * @Input:
+ *      Connector / instance to add to an internal structure
+ * @Return
+ *      The current head of the linked list of connector_instance
+ *
+ */
 
-struct section {
-    avl avl;                // the index entry of this section - this has to be first!
+_CONNECTOR_INSTANCE *add_connector_instance(struct section *connector, struct section *instance)
+{
+    static struct _connector_instance *global_connector_instance = NULL;
+    struct _connector_instance *local_ci, *local_ci_tmp;
+
+    if (unlikely(!connector)) {
+        if (unlikely(!instance))
+            return global_connector_instance;
+
+        local_ci = global_connector_instance;
+        while (local_ci) {
+            local_ci_tmp = local_ci->next;
+            freez(local_ci);
+            local_ci = local_ci_tmp;
+        }
+        global_connector_instance = NULL;
+        return NULL;
+    }
 
-    uint32_t hash;          // a simple hash to speed up searching
-                            // we first compare hashes, and only if the hashes are equal we do string comparisons
+    local_ci = callocz(1, sizeof(struct _connector_instance));
+    local_ci->instance = instance;
+    local_ci->connector = connector;
+    strncpy(local_ci->instance_name, instance->name, CONFIG_MAX_NAME);
+    strncpy(local_ci->connector_name, connector->name, CONFIG_MAX_NAME);
+    local_ci->next = global_connector_instance;
+    global_connector_instance = local_ci;
 
-    char *name;
+    return global_connector_instance;
+}
 
-    struct section *next;    // gloabl config_mutex protects just this
+int is_valid_connector(char *type, int check_reserved)
+{
+    int rc = 1;
 
-    struct config_option *values;
-    avl_tree_lock values_index;
+    if (unlikely(!type))
+        return 0;
 
-    netdata_mutex_t mutex;  // this locks only the writers, to ensure atomic updates
-                            // readers are protected using the rwlock in avl_tree_lock
-};
+    if (!check_reserved) {
+        if (unlikely(is_valid_connector(type,1))) {
+            return 0;
+        }
+        //if (unlikely(*type == ':')
+        //    return 0;
+        char *separator = strrchr(type, ':');
+        if (likely(separator)) {
+            *separator = '\0';
+            rc = separator - type;
+        } else
+            return 0;
+    }
+//    else {
+//        if (unlikely(is_valid_connector(type,1))) {
+//            error("Section %s invalid -- reserved name", type);
+//            return 0;
+//        }
+//    }
+
+    if (!strcmp(type, "graphite") || !strcmp(type, "graphite:plaintext")) {
+        return rc;
+    } else if (!strcmp(type, "graphite:http") || !strcmp(type, "graphite:https")) {
+        return rc;
+    } else if (!strcmp(type, "json") || !strcmp(type, "json:plaintext")) {
+        return rc;
+    } else if (!strcmp(type, "json:http") || !strcmp(type, "json:https")) {
+        return rc;
+    } else if (!strcmp(type, "opentsdb") || !strcmp(type, "opentsdb:telnet")) {
+        return rc;
+    } else if (!strcmp(type, "opentsdb:http") || !strcmp(type, "opentsdb:https")) {
+        return rc;
+    } else if (!strcmp(type, "prometheus_remote_write")) {
+        return rc;
+    } else if (!strcmp(type, "prometheus_remote_write:http") || !strcmp(type, "prometheus_remote_write:https")) {
+        return rc;
+    } else if (!strcmp(type, "kinesis") || !strcmp(type, "kinesis:plaintext")) {
+        return rc;
+    } else if (!strcmp(type, "pubsub") || !strcmp(type, "pubsub:plaintext")) {
+        return rc;
+    } else if (!strcmp(type, "mongodb") || !strcmp(type, "mongodb:plaintext")) {
+        return rc;
+    }
 
+    return 0;
+}
 
 // ----------------------------------------------------------------------------
 // locking
 
-static inline void appconfig_wrlock(struct config *root) {
+inline void appconfig_wrlock(struct config *root) {
     netdata_mutex_lock(&root->mutex);
 }
 
-static inline void appconfig_unlock(struct config *root) {
+inline void appconfig_unlock(struct config *root) {
     netdata_mutex_unlock(&root->mutex);
 }
 
-static inline void config_section_wrlock(struct section *co) {
+inline void config_section_wrlock(struct section *co) {
     netdata_mutex_lock(&co->mutex);
 }
 
-static inline void config_section_unlock(struct section *co) {
+inline void config_section_unlock(struct section *co) {
     netdata_mutex_unlock(&co->mutex);
 }
 
@@ -126,17 +177,61 @@ static inline struct section *appconfig_section_create(struct config *root, cons
         error("INTERNAL ERROR: indexing of section '%s', already exists.", co->name);
 
     appconfig_wrlock(root);
-    struct section *co2 = root->sections;
+    struct section *co2 = root->last_section;
     if(co2) {
-        while (co2->next) co2 = co2->next;
         co2->next = co;
+    } else {
+        root->first_section = co;
     }
-    else root->sections = co;
+    root->last_section = co;
     appconfig_unlock(root);
 
     return co;
 }
 
+void appconfig_section_destroy_non_loaded(struct config *root, const char *section)
+{
+    struct section *co;
+    struct config_option *cv, *cv_next;
+
+    debug(D_CONFIG, "Destroying section '%s'.", section);
+
+    co = appconfig_section_find(root, section);
+    if(!co) {
+        error("Could not destroy section '%s'. Not found.", section);
+        return;
+    }
+
+    config_section_wrlock(co);
+    for(cv = co->values; cv ; cv = cv->next) {
+        if (cv->flags & CONFIG_VALUE_LOADED) {
+            /* Do not destroy values that were loaded from the configuration files. */
+            config_section_unlock(co);
+            return;
+        }
+    }
+    for(cv = co->values ; cv ; cv = cv_next) {
+        cv_next = cv->next;
+        if(unlikely(!appconfig_option_index_del(co, cv)))
+            error("Cannot remove config option '%s' from section '%s'.", cv->name, co->name);
+        freez(cv->value);
+        freez(cv->name);
+        freez(cv);
+    }
+    co->values = NULL;
+    config_section_unlock(co);
+
+    if (unlikely(!appconfig_index_del(root, co))) {
+        error("Cannot remove section '%s' from config.", section);
+        return;
+    }
+
+    avl_destroy_lock(&co->values_index);
+    freez(co->name);
+    pthread_mutex_destroy(&co->mutex);
+    freez(co);
+}
+
 
 // ----------------------------------------------------------------------------
 // config name-value methods
@@ -241,27 +336,25 @@ cleanup:
     return ret;
 }
 
-char *appconfig_get(struct config *root, const char *section, const char *name, const char *default_value)
+char *appconfig_get_by_section(struct section *co, const char *name, const char *default_value)
 {
     struct config_option *cv;
 
-    debug(D_CONFIG, "request to get config in section '%s', name '%s', default_value '%s'", section, name, default_value);
-
-    struct section *co = appconfig_section_find(root, section);
-    if(!co) co = appconfig_section_create(root, section);
-
+    // Only calls internal to this file check for a NULL result and they do not supply a NULL arg.
+    // External caller should treat NULL as an error case.
     cv = appconfig_option_index_find(co, name, 0);
-    if(!cv) {
+    if (!cv) {
+        if (!default_value) return NULL;
         cv = appconfig_value_create(co, name, default_value);
-        if(!cv) return NULL;
+        if (!cv) return NULL;
     }
     cv->flags |= CONFIG_VALUE_USED;
 
     if((cv->flags & CONFIG_VALUE_LOADED) || (cv->flags & CONFIG_VALUE_CHANGED)) {
         // this is a loaded value from the config file
-        // if it is different that the default, mark it
+        // if it is different than the default, mark it
         if(!(cv->flags & CONFIG_VALUE_CHECKED)) {
-            if(strcmp(cv->value, default_value) != 0) cv->flags |= CONFIG_VALUE_CHANGED;
+            if(default_value && strcmp(cv->value, default_value) != 0) cv->flags |= CONFIG_VALUE_CHANGED;
             cv->flags |= CONFIG_VALUE_CHECKED;
         }
     }
@@ -269,6 +362,22 @@ char *appconfig_get(struct config *root, const char *section, const char *name,
     return(cv->value);
 }
 
+
+char *appconfig_get(struct config *root, const char *section, const char *name, const char *default_value)
+{
+    if (default_value == NULL)
+        debug(D_CONFIG, "request to get config in section '%s', name '%s' or fail", section, name);
+    else
+        debug(D_CONFIG, "request to get config in section '%s', name '%s', default_value '%s'", section, name, default_value);
+
+    struct section *co = appconfig_section_find(root, section);
+    if (!co && !default_value)
+        return NULL;
+    if(!co) co = appconfig_section_create(root, section);
+
+    return appconfig_get_by_section(co, name, default_value);
+}
+
 long long appconfig_get_number(struct config *root, const char *section, const char *name, long long value)
 {
     char buffer[100], *s;
@@ -291,6 +400,23 @@ LONG_DOUBLE appconfig_get_float(struct config *root, const char *section, const
     return str2ld(s, NULL);
 }
 
+static inline int appconfig_test_boolean_value(char *s) {
+    if(!strcasecmp(s, "yes") || !strcasecmp(s, "true") || !strcasecmp(s, "on")
+       || !strcasecmp(s, "auto") || !strcasecmp(s, "on demand"))
+        return 1;
+
+    return 0;
+}
+
+int appconfig_get_boolean_by_section(struct section *co, const char *name, int value) {
+    char *s;
+
+    s = appconfig_get_by_section(co, name, (!value)?"no":"yes");
+    if(!s) return value;
+
+    return appconfig_test_boolean_value(s);
+}
+
 int appconfig_get_boolean(struct config *root, const char *section, const char *name, int value)
 {
     char *s;
@@ -300,8 +426,7 @@ int appconfig_get_boolean(struct config *root, const char *section, const char *
     s = appconfig_get(root, section, name, s);
     if(!s) return value;
 
-    if(!strcasecmp(s, "yes") || !strcasecmp(s, "true") || !strcasecmp(s, "on") || !strcasecmp(s, "auto") || !strcasecmp(s, "on demand")) return 1;
-    return 0;
+    return appconfig_test_boolean_value(s);
 }
 
 int appconfig_get_boolean_ondemand(struct config *root, const char *section, const char *name, int value)
@@ -436,10 +561,16 @@ int appconfig_get_duration(struct config *root, const char *section, const char
 // ----------------------------------------------------------------------------
 // config load/save
 
-int appconfig_load(struct config *root, char *filename, int overwrite_used)
+int appconfig_load(struct config *root, char *filename, int overwrite_used, const char *section_name)
 {
     int line = 0;
     struct section *co = NULL;
+    int is_exporter_config = 0;
+    int _backends = 0;              // number of backend sections we have
+    char working_instance[CONFIG_MAX_NAME + 1];
+    char working_connector[CONFIG_MAX_NAME + 1];
+    struct section *working_connector_section = NULL;
+    int global_exporting_section = 0;
 
     char buffer[CONFIG_FILE_LINE_MAX + 1], *s;
 
@@ -453,6 +584,12 @@ int appconfig_load(struct config *root, char *filename, int overwrite_used)
         return 0;
     }
 
+    uint32_t section_hash = 0;
+    if(section_name) {
+        section_hash = simple_hash(section_name);
+    }
+    is_exporter_config = (strstr(filename, EXPORTING_CONF) != NULL);
+
     while(fgets(buffer, CONFIG_FILE_LINE_MAX, fp) != NULL) {
         buffer[CONFIG_FILE_LINE_MAX] = '\0';
         line++;
@@ -469,9 +606,57 @@ int appconfig_load(struct config *root, char *filename, int overwrite_used)
             s[len - 1] = '\0';
             s++;
 
+            if (is_exporter_config) {
+                global_exporting_section =
+                    !(strcmp(s, CONFIG_SECTION_EXPORTING)) || !(strcmp(s, CONFIG_SECTION_PROMETHEUS));
+                if (unlikely(!global_exporting_section)) {
+                    int rc;
+                    rc = is_valid_connector(s, 0);
+                    if (likely(rc)) {
+                        strncpy(working_connector, s, CONFIG_MAX_NAME);
+                        s = s + rc + 1;
+                        if (unlikely(!(*s))) {
+                            _backends++;
+                            sprintf(buffer, "instance_%d", _backends);
+                            s = buffer;
+                        }
+                        strncpy(working_instance, s, CONFIG_MAX_NAME);
+                        working_connector_section = NULL;
+                        if (unlikely(appconfig_section_find(root, working_instance))) {
+                            error("Instance (%s) already exists", working_instance);
+                            co = NULL;
+                            continue;
+                        }
+                    } else {
+                        co = NULL;
+                        error("Section (%s) does not specify a valid connector", s);
+                        continue;
+                    }
+                }
+            }
+
             co = appconfig_section_find(root, s);
             if(!co) co = appconfig_section_create(root, s);
 
+            if(co && section_name && overwrite_used && section_hash == co->hash && !strcmp(section_name, co->name)) {
+                config_section_wrlock(co);
+                struct config_option *cv2 = co->values;
+                while (cv2) {
+                    struct config_option *save = cv2->next;
+                    struct config_option *found = appconfig_option_index_del(co, cv2);
+                    if(found != cv2)
+                        error("INTERNAL ERROR: Cannot remove '%s' from  section '%s', it was not inserted before.",
+                               cv2->name, co->name);
+
+                    freez(cv2->name);
+                    freez(cv2->value);
+                    freez(cv2);
+                    cv2 = save;
+                }
+                co->values = NULL;
+                config_section_unlock(co);
+            }
+
             continue;
         }
 
@@ -481,6 +666,10 @@ int appconfig_load(struct config *root, char *filename, int overwrite_used)
             continue;
         }
 
+        if(section_name && overwrite_used && section_hash != co->hash && strcmp(section_name, co->name)) {
+            continue;
+        }
+
         char *name = s;
         char *value = strchr(s, '=');
         if(!value) {
@@ -502,15 +691,32 @@ int appconfig_load(struct config *root, char *filename, int overwrite_used)
 
         struct config_option *cv = appconfig_option_index_find(co, name, 0);
 
-        if(!cv) cv = appconfig_value_create(co, name, value);
-        else {
-            if(((cv->flags & CONFIG_VALUE_USED) && overwrite_used) || !(cv->flags & CONFIG_VALUE_USED)) {
-                debug(D_CONFIG, "CONFIG: line %d of file '%s', overwriting '%s/%s'.", line, filename, co->name, cv->name);
+        if (!cv) {
+            cv = appconfig_value_create(co, name, value);
+            if (likely(is_exporter_config) && unlikely(!global_exporting_section)) {
+                if (unlikely(!working_connector_section)) {
+                    working_connector_section = appconfig_section_find(root, working_connector);
+                    if (!working_connector_section)
+                        working_connector_section = appconfig_section_create(root, working_connector);
+                    if (likely(working_connector_section)) {
+                        add_connector_instance(working_connector_section, co);
+                    }
+                }
+            }
+        } else {
+            if (((cv->flags & CONFIG_VALUE_USED) && overwrite_used) || !(cv->flags & CONFIG_VALUE_USED)) {
+                debug(
+                    D_CONFIG, "CONFIG: line %d of file '%s', overwriting '%s/%s'.", line, filename, co->name, cv->name);
                 freez(cv->value);
                 cv->value = strdupz(value);
-            }
-            else
-                debug(D_CONFIG, "CONFIG: ignoring line %d of file '%s', '%s/%s' is already present and used.", line, filename, co->name, cv->name);
+            } else
+                debug(
+                    D_CONFIG,
+                    "CONFIG: ignoring line %d of file '%s', '%s/%s' is already present and used.",
+                    line,
+                    filename,
+                    co->name,
+                    cv->name);
         }
         cv->flags |= CONFIG_VALUE_LOADED;
     }
@@ -554,7 +760,7 @@ void appconfig_generate(struct config *root, BUFFER *wb, int only_changed)
         }
 
         appconfig_wrlock(root);
-        for(co = root->sections; co ; co = co->next) {
+        for(co = root->first_section; co ; co = co->next) {
             if(!strcmp(co->name, CONFIG_SECTION_GLOBAL)
                || !strcmp(co->name, CONFIG_SECTION_WEB)
                || !strcmp(co->name, CONFIG_SECTION_STATSD)
@@ -564,6 +770,7 @@ void appconfig_generate(struct config *root, BUFFER *wb, int only_changed)
                || !strcmp(co->name, CONFIG_SECTION_HEALTH)
                || !strcmp(co->name, CONFIG_SECTION_BACKEND)
                || !strcmp(co->name, CONFIG_SECTION_STREAM)
+               || !strcmp(co->name, CONFIG_SECTION_HOST_LABEL)
                     )
                 pri = 0;
             else if(!strncmp(co->name, "plugin:", 7)) pri = 1;
@@ -669,3 +876,8 @@ int config_parse_duration(const char* string, int* result) {
     *result = 0;
     return 0;
 }
+
+struct section *appconfig_get_section(struct config *root, const char *name)
+{
+    return appconfig_section_find(root, name);
+}
diff --git a/libnetdata/config/appconfig.h b/libnetdata/config/appconfig.h
index 32e289f9c..9d02e4ada 100644
--- a/libnetdata/config/appconfig.h
+++ b/libnetdata/config/appconfig.h
@@ -82,23 +82,67 @@
 
 #define CONFIG_FILENAME "netdata.conf"
 
-#define CONFIG_SECTION_GLOBAL   "global"
-#define CONFIG_SECTION_WEB      "web"
-#define CONFIG_SECTION_STATSD   "statsd"
-#define CONFIG_SECTION_PLUGINS  "plugins"
-#define CONFIG_SECTION_CLOUD    "cloud"
-#define CONFIG_SECTION_REGISTRY "registry"
-#define CONFIG_SECTION_HEALTH   "health"
-#define CONFIG_SECTION_BACKEND  "backend"
-#define CONFIG_SECTION_STREAM   "stream"
+#define CONFIG_SECTION_GLOBAL     "global"
+#define CONFIG_SECTION_WEB        "web"
+#define CONFIG_SECTION_STATSD     "statsd"
+#define CONFIG_SECTION_PLUGINS    "plugins"
+#define CONFIG_SECTION_CLOUD      "cloud"
+#define CONFIG_SECTION_REGISTRY   "registry"
+#define CONFIG_SECTION_HEALTH     "health"
+#define CONFIG_SECTION_BACKEND    "backend"
+#define CONFIG_SECTION_STREAM     "stream"
+#define CONFIG_SECTION_EXPORTING  "exporting:global"
+#define CONFIG_SECTION_PROMETHEUS "prometheus:exporter"
+#define CONFIG_SECTION_HOST_LABEL "host labels"
+#define EXPORTING_CONF            "exporting.conf"
 
 // these are used to limit the configuration names and values lengths
 // they are not enforced by config.c functions (they will strdup() all strings, no matter of their length)
 #define CONFIG_MAX_NAME 1024
 #define CONFIG_MAX_VALUE 2048
 
+// ----------------------------------------------------------------------------
+// Config definitions
+#define CONFIG_FILE_LINE_MAX ((CONFIG_MAX_NAME + CONFIG_MAX_VALUE + 1024) * 2)
+
+#define CONFIG_VALUE_LOADED  0x01 // has been loaded from the config
+#define CONFIG_VALUE_USED    0x02 // has been accessed from the program
+#define CONFIG_VALUE_CHANGED 0x04 // has been changed from the loaded value or the internal default value
+#define CONFIG_VALUE_CHECKED 0x08 // has been checked if the value is different from the default
+
+struct config_option {
+    avl avl_node;           // the index entry of this entry - this has to be first!
+
+    uint8_t flags;
+    uint32_t hash;          // a simple hash to speed up searching
+                            // we first compare hashes, and only if the hashes are equal we do string comparisons
+
+    char *name;
+    char *value;
+
+    struct config_option *next; // config->mutex protects just this
+};
+
+struct section {
+    avl avl_node;           // the index entry of this section - this has to be first!
+
+    uint32_t hash;          // a simple hash to speed up searching
+                            // we first compare hashes, and only if the hashes are equal we do string comparisons
+
+    char *name;
+
+    struct section *next;    // gloabl config_mutex protects just this
+
+    struct config_option *values;
+    avl_tree_lock values_index;
+
+    netdata_mutex_t mutex;  // this locks only the writers, to ensure atomic updates
+                            // readers are protected using the rwlock in avl_tree_lock
+};
+
 struct config {
-    struct section *sections;
+    struct section *first_section;
+    struct section *last_section; // optimize inserting at the end
     netdata_mutex_t mutex;
     avl_tree_lock index;
 };
@@ -112,11 +156,15 @@ struct config {
 #define CONFIG_BOOLEAN_AUTO 2       // enabled if it has useful info when enabled
 #endif
 
-extern int appconfig_load(struct config *root, char *filename, int overwrite_used);
+extern int appconfig_load(struct config *root, char *filename, int overwrite_used, const char *section_name);
+extern void config_section_wrlock(struct section *co);
+extern void config_section_unlock(struct section *co);
 
+extern char *appconfig_get_by_section(struct section *co, const char *name, const char *default_value);
 extern char *appconfig_get(struct config *root, const char *section, const char *name, const char *default_value);
 extern long long appconfig_get_number(struct config *root, const char *section, const char *name, long long value);
 extern LONG_DOUBLE appconfig_get_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value);
+extern int appconfig_get_boolean_by_section(struct section *co, const char *name, int value);
 extern int appconfig_get_boolean(struct config *root, const char *section, const char *name, int value);
 extern int appconfig_get_boolean_ondemand(struct config *root, const char *section, const char *name, int value);
 extern int appconfig_get_duration(struct config *root, const char *section, const char *name, const char *value);
@@ -134,6 +182,28 @@ extern void appconfig_generate(struct config *root, BUFFER *wb, int only_changed
 
 extern int appconfig_section_compare(void *a, void *b);
 
+extern void appconfig_section_destroy_non_loaded(struct config *root, const char *section);
+
 extern int config_parse_duration(const char* string, int* result);
 
+extern struct section *appconfig_get_section(struct config *root, const char *name);
+
+extern void appconfig_wrlock(struct config *root);
+extern void appconfig_unlock(struct config *root);
+
+struct connector_instance {
+    char instance_name[CONFIG_MAX_NAME + 1];
+    char connector_name[CONFIG_MAX_NAME + 1];
+};
+
+typedef struct _connector_instance {
+    struct section *connector;        // actual connector
+    struct section *instance;         // This instance
+    char instance_name[CONFIG_MAX_NAME + 1];
+    char connector_name[CONFIG_MAX_NAME + 1];
+    struct _connector_instance *next; // Next instance
+} _CONNECTOR_INSTANCE;
+
+extern _CONNECTOR_INSTANCE *add_connector_instance(struct section *connector, struct section *instance);
+
 #endif /* NETDATA_CONFIG_H */
diff --git a/libnetdata/dictionary/Makefile.in b/libnetdata/dictionary/Makefile.in
deleted file mode 100644
index e9401a646..000000000
--- a/libnetdata/dictionary/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
-# Makefile.in generated by automake 1.15.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994-2017 Free Software Foundation, Inc.
-
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# SPDX-License-Identifier: GPL-3.0-or-later
-
-VPATH = @srcdir@
-am__is_gnu_make = { \
-  if test -z '$(MAKELEVEL)'; then \
-    false; \
-  elif test -n '$(MAKE_HOST)'; then \
-    true; \
-  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
-    true; \
-  else \
-    false; \
-  fi; \
-}
-am__make_running_with_option = \
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diff --git a/libnetdata/dictionary/dictionary.h b/libnetdata/dictionary/dictionary.h
index 9be261eb2..fc24ec2ec 100644
--- a/libnetdata/dictionary/dictionary.h
+++ b/libnetdata/dictionary/dictionary.h
@@ -13,7 +13,7 @@ struct dictionary_stats {
 };
 
 typedef struct name_value {
-    avl avl;                // the index - this has to be first!
+    avl avl_node;           // the index - this has to be first!
 
     uint32_t hash;          // a simple hash to speed up searching
                             // we first compare hashes, and only if the hashes are equal we do string comparisons
@@ -23,7 +23,7 @@ typedef struct name_value {
 } NAME_VALUE;
 
 typedef struct dictionary {
-    avl_tree values_index;
+    avl_tree_type values_index;
 
     uint8_t flags;
 
diff --git a/libnetdata/ebpf/Makefile.am b/libnetdata/ebpf/Makefile.am
new file mode 100644
index 000000000..161784b8f
--- /dev/null
+++ b/libnetdata/ebpf/Makefile.am
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+    README.md \
+    $(NULL)
diff --git a/libnetdata/ebpf/README.md b/libnetdata/ebpf/README.md
new file mode 100644
index 000000000..72446eb5b
--- /dev/null
+++ b/libnetdata/ebpf/README.md
@@ -0,0 +1 @@
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Flibnetdata%2Febpf%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)
diff --git a/libnetdata/ebpf/ebpf.c b/libnetdata/ebpf/ebpf.c
new file mode 100644
index 000000000..a9ff21f69
--- /dev/null
+++ b/libnetdata/ebpf/ebpf.c
@@ -0,0 +1,324 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dlfcn.h>
+#include <sys/utsname.h>
+
+#include "../libnetdata.h"
+
+/*
+static int clean_kprobe_event(FILE *out, char *filename, char *father_pid, netdata_ebpf_events_t *ptr)
+{
+    int fd = open(filename, O_WRONLY | O_APPEND, 0);
+    if (fd < 0) {
+        if (out) {
+            fprintf(out, "Cannot open %s : %s\n", filename, strerror(errno));
+        }
+        return 1;
+    }
+
+    char cmd[1024];
+    int length = snprintf(cmd, 1023, "-:kprobes/%c_netdata_%s_%s", ptr->type, ptr->name, father_pid);
+    int ret = 0;
+    if (length > 0) {
+        ssize_t written = write(fd, cmd, strlen(cmd));
+        if (written < 0) {
+            if (out) {
+                fprintf(
+                    out, "Cannot remove the event (%d, %d) '%s' from %s : %s\n", getppid(), getpid(), cmd, filename,
+                    strerror((int)errno));
+            }
+            ret = 1;
+        }
+    }
+
+    close(fd);
+
+    return ret;
+}
+
+int clean_kprobe_events(FILE *out, int pid, netdata_ebpf_events_t *ptr)
+{
+    debug(D_EXIT, "Cleaning parent process events.");
+    char filename[FILENAME_MAX + 1];
+    snprintf(filename, FILENAME_MAX, "%s%s", NETDATA_DEBUGFS, "kprobe_events");
+
+    char removeme[16];
+    snprintf(removeme, 15, "%d", pid);
+
+    int i;
+    for (i = 0; ptr[i].name; i++) {
+        if (clean_kprobe_event(out, filename, removeme, &ptr[i])) {
+            break;
+        }
+    }
+
+    return 0;
+}
+*/
+
+//----------------------------------------------------------------------------------------------------------------------
+
+int get_kernel_version(char *out, int size)
+{
+    char major[16], minor[16], patch[16];
+    char ver[VERSION_STRING_LEN];
+    char *version = ver;
+
+    out[0] = '\0';
+    int fd = open("/proc/sys/kernel/osrelease", O_RDONLY);
+    if (fd < 0)
+        return -1;
+
+    ssize_t len = read(fd, ver, sizeof(ver));
+    if (len < 0) {
+        close(fd);
+        return -1;
+    }
+
+    close(fd);
+
+    char *move = major;
+    while (*version && *version != '.')
+        *move++ = *version++;
+    *move = '\0';
+
+    version++;
+    move = minor;
+    while (*version && *version != '.')
+        *move++ = *version++;
+    *move = '\0';
+
+    if (*version)
+        version++;
+    else
+        return -1;
+
+    move = patch;
+    while (*version && *version != '\n')
+        *move++ = *version++;
+    *move = '\0';
+
+    fd = snprintf(out, (size_t)size, "%s.%s.%s", major, minor, patch);
+    if (fd > size)
+        error("The buffer to store kernel version is not smaller than necessary.");
+
+    return ((int)(str2l(major) * 65536) + (int)(str2l(minor) * 256) + (int)str2l(patch));
+}
+
+int get_redhat_release()
+{
+    char buffer[VERSION_STRING_LEN + 1];
+    int major, minor;
+    FILE *fp = fopen("/etc/redhat-release", "r");
+
+    if (fp) {
+        major = 0;
+        minor = -1;
+        size_t length = fread(buffer, sizeof(char), VERSION_STRING_LEN, fp);
+        if (length > 4) {
+            buffer[length] = '\0';
+            char *end = strchr(buffer, '.');
+            char *start;
+            if (end) {
+                *end = 0x0;
+
+                if (end > buffer) {
+                    start = end - 1;
+
+                    major = strtol(start, NULL, 10);
+                    start = ++end;
+
+                    end++;
+                    if (end) {
+                        end = 0x00;
+                        minor = strtol(start, NULL, 10);
+                    } else {
+                        minor = -1;
+                    }
+                }
+            }
+        }
+
+        fclose(fp);
+        return ((major * 256) + minor);
+    } else {
+        return -1;
+    }
+}
+
+/**
+ * Check if the kernel is in a list of rejected ones
+ *
+ * @return Returns 1 if the kernel is rejected, 0 otherwise.
+ */
+static int kernel_is_rejected()
+{
+    // Get kernel version from system
+    char version_string[VERSION_STRING_LEN + 1];
+    int version_string_len = 0;
+
+    if (read_file("/proc/version_signature", version_string, VERSION_STRING_LEN)) {
+        if (read_file("/proc/version", version_string, VERSION_STRING_LEN)) {
+            struct utsname uname_buf;
+            if (!uname(&uname_buf)) {
+                info("Cannot check kernel version");
+                return 0;
+            }
+            version_string_len =
+                snprintfz(version_string, VERSION_STRING_LEN, "%s %s", uname_buf.release, uname_buf.version);
+        }
+    }
+
+    if (!version_string_len)
+        version_string_len = strlen(version_string);
+
+    // Open a file with a list of rejected kernels
+    char *config_dir = getenv("NETDATA_USER_CONFIG_DIR");
+    if (config_dir == NULL) {
+        config_dir = CONFIG_DIR;
+    }
+
+    char filename[FILENAME_MAX + 1];
+    snprintfz(filename, FILENAME_MAX, "%s/%s", config_dir, EBPF_KERNEL_REJECT_LIST_FILE);
+    FILE *kernel_reject_list = fopen(filename, "r");
+
+    if (!kernel_reject_list) {
+        config_dir = getenv("NETDATA_STOCK_CONFIG_DIR");
+        if (config_dir == NULL) {
+            config_dir = LIBCONFIG_DIR;
+        }
+
+        snprintfz(filename, FILENAME_MAX, "%s/%s", config_dir, EBPF_KERNEL_REJECT_LIST_FILE);
+        kernel_reject_list = fopen(filename, "r");
+
+        if (!kernel_reject_list)
+            return 0;
+    }
+
+    // Find if the kernel is in the reject list
+    char *reject_string = NULL;
+    size_t buf_len = 0;
+    ssize_t reject_string_len;
+    while ((reject_string_len = getline(&reject_string, &buf_len, kernel_reject_list) - 1) > 0) {
+        if (version_string_len >= reject_string_len) {
+            if (!strncmp(version_string, reject_string, reject_string_len)) {
+                info("A buggy kernel is detected");
+                fclose(kernel_reject_list);
+                freez(reject_string);
+                return 1;
+            }
+        }
+    }
+
+    fclose(kernel_reject_list);
+    freez(reject_string);
+
+    return 0;
+}
+
+static int has_ebpf_kernel_version(int version)
+{
+    if (kernel_is_rejected())
+        return 0;
+
+    // Kernel 4.11.0 or RH > 7.5
+    return (version >= NETDATA_MINIMUM_EBPF_KERNEL || get_redhat_release() >= NETDATA_MINIMUM_RH_VERSION);
+}
+
+int has_condition_to_run(int version)
+{
+    if (!has_ebpf_kernel_version(version))
+        return 0;
+
+    return 1;
+}
+
+//----------------------------------------------------------------------------------------------------------------------
+
+char *ebpf_kernel_suffix(int version, int isrh)
+{
+    if (isrh) {
+        if (version >= NETDATA_EBPF_KERNEL_4_11)
+            return "4.18";
+        else
+            return "3.10";
+    } else {
+        if (version >= NETDATA_EBPF_KERNEL_5_10)
+            return "5.10";
+        else if (version >= NETDATA_EBPF_KERNEL_4_17)
+            return "5.4";
+        else if (version >= NETDATA_EBPF_KERNEL_4_15)
+            return "4.16";
+        else if (version >= NETDATA_EBPF_KERNEL_4_11)
+            return "4.14";
+    }
+
+    return NULL;
+}
+
+//----------------------------------------------------------------------------------------------------------------------
+
+int ebpf_update_kernel(ebpf_data_t *ed)
+{
+    char *kernel = ebpf_kernel_suffix(ed->running_on_kernel, (ed->isrh < 0) ? 0 : 1);
+    size_t length = strlen(kernel);
+    strncpyz(ed->kernel_string, kernel, length);
+    ed->kernel_string[length] = '\0';
+
+    return 0;
+}
+
+static int select_file(char *name, const char *program, size_t length, int mode, char *kernel_string)
+{
+    int ret = -1;
+    if (!mode)
+        ret = snprintf(name, length, "rnetdata_ebpf_%s.%s.o", program, kernel_string);
+    else if (mode == 1)
+        ret = snprintf(name, length, "dnetdata_ebpf_%s.%s.o", program, kernel_string);
+    else if (mode == 2)
+        ret = snprintf(name, length, "pnetdata_ebpf_%s.%s.o", program, kernel_string);
+
+    return ret;
+}
+
+struct bpf_link **ebpf_load_program(char *plugins_dir, ebpf_module_t *em, char *kernel_string, struct bpf_object **obj, int *map_fd)
+{
+    char lpath[4096];
+    char lname[128];
+    int prog_fd;
+
+    int test = select_file(lname, em->thread_name, (size_t)127, em->mode, kernel_string);
+    if (test < 0 || test > 127)
+        return NULL;
+
+    snprintf(lpath, 4096, "%s/%s", plugins_dir, lname);
+    if (bpf_prog_load(lpath, BPF_PROG_TYPE_KPROBE, obj, &prog_fd)) {
+        em->enabled = CONFIG_BOOLEAN_NO;
+        info("Cannot load program: %s", lpath);
+        return NULL;
+    } else {
+        info("The eBPF program %s was loaded with success.", em->thread_name);
+    }
+
+    struct bpf_map *map;
+    size_t i = 0;
+    bpf_map__for_each(map, *obj)
+    {
+        map_fd[i] = bpf_map__fd(map);
+        i++;
+    }
+
+    struct bpf_program *prog;
+    struct bpf_link **links = callocz(NETDATA_MAX_PROBES , sizeof(struct bpf_link *));
+    i = 0;
+    bpf_object__for_each_program(prog, *obj)
+    {
+        links[i] = bpf_program__attach(prog);
+        i++;
+    }
+
+    return links;
+}
diff --git a/libnetdata/ebpf/ebpf.h b/libnetdata/ebpf/ebpf.h
new file mode 100644
index 000000000..d4faccffd
--- /dev/null
+++ b/libnetdata/ebpf/ebpf.h
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_EBPF_H
+#define NETDATA_EBPF_H 1
+
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+
+#define NETDATA_DEBUGFS "/sys/kernel/debug/tracing/"
+
+/**
+ * The next magic number is got doing the following math:
+ *  294960 = 4*65536 + 11*256 + 0
+ *
+ *  For more details, please, read /usr/include/linux/version.h
+ */
+#define NETDATA_MINIMUM_EBPF_KERNEL 264960
+
+/**
+ * The RedHat magic number was got doing:
+ *
+ * 1797 = 7*256 + 5
+ *
+ *  For more details, please, read /usr/include/linux/version.h
+ *  in any Red Hat installation.
+ */
+#define NETDATA_MINIMUM_RH_VERSION 1797
+
+/**
+ * 2048 = 8*256 + 0
+ */
+#define NETDATA_RH_8 2048
+
+/**
+ *  Kernel 5.10
+ *
+ *  330240 = 5*65536 + 10*256
+ */
+#define NETDATA_EBPF_KERNEL_5_10 330240
+
+/**
+ *  Kernel 4.17
+ *
+ *  266496 = 4*65536 + 17*256
+ */
+#define NETDATA_EBPF_KERNEL_4_17 266496
+
+/**
+ *  Kernel 4.15
+ *
+ *  265984 = 4*65536 + 15*256
+ */
+#define NETDATA_EBPF_KERNEL_4_15 265984
+
+/**
+ *  Kernel 4.11
+ *
+ *  264960 = 4*65536 + 15*256
+ */
+#define NETDATA_EBPF_KERNEL_4_11 264960
+
+#define VERSION_STRING_LEN 256
+#define EBPF_KERNEL_REJECT_LIST_FILE "ebpf_kernel_reject_list.txt"
+
+typedef struct ebpf_data {
+    int *map_fd;
+
+    char *kernel_string;
+    uint32_t running_on_kernel;
+    int isrh;
+} ebpf_data_t;
+
+typedef enum {
+    MODE_RETURN = 0, // This attaches kprobe when the function returns
+    MODE_DEVMODE,    // This stores log given description about the errors raised
+    MODE_ENTRY       // This attaches kprobe when the function is called
+} netdata_run_mode_t;
+
+typedef struct ebpf_module {
+    const char *thread_name;
+    const char *config_name;
+    int enabled;
+    void *(*start_routine)(void *);
+    int update_time;
+    int global_charts;
+    int apps_charts;
+    netdata_run_mode_t mode;
+    uint32_t thread_id;
+    int optional;
+} ebpf_module_t;
+
+#define NETDATA_MAX_PROBES 64
+
+extern int get_kernel_version(char *out, int size);
+extern int get_redhat_release();
+extern int has_condition_to_run(int version);
+extern char *ebpf_kernel_suffix(int version, int isrh);
+extern int ebpf_update_kernel(ebpf_data_t *ef);
+extern struct bpf_link **ebpf_load_program(char *plugins_dir,
+                             ebpf_module_t *em,
+                             char *kernel_string,
+                             struct bpf_object **obj,
+                             int *map_fd);
+
+#endif /* NETDATA_EBPF_H */
diff --git a/libnetdata/eval/Makefile.in b/libnetdata/eval/Makefile.in
deleted file mode 100644
index 69ff2ef38..000000000
--- a/libnetdata/eval/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
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diff --git a/libnetdata/eval/eval.c b/libnetdata/eval/eval.c
index f8af801f5..b53b07039 100644
--- a/libnetdata/eval/eval.c
+++ b/libnetdata/eval/eval.c
@@ -80,7 +80,7 @@ static inline calculated_number eval_variable(EVAL_EXPRESSION *exp, EVAL_VARIABL
     }
 
     if(unlikely(v->hash == this_hash && !strcmp(v->name, "this"))) {
-        n = (exp->this)?*exp->this:NAN;
+        n = (exp->myself)?*exp->myself:NAN;
         buffer_strcat(exp->error_msg, "[ $this = ");
         print_parsed_as_constant(exp->error_msg, n);
         buffer_strcat(exp->error_msg, " ] ");
diff --git a/libnetdata/eval/eval.h b/libnetdata/eval/eval.h
index 57dae9d0b..fc03d7c1f 100644
--- a/libnetdata/eval/eval.h
+++ b/libnetdata/eval/eval.h
@@ -28,7 +28,7 @@ typedef struct eval_expression {
     const char *parsed_as;
 
     RRDCALC_STATUS *status;
-    calculated_number *this;
+    calculated_number *myself;
     time_t *after;
     time_t *before;
 
diff --git a/libnetdata/health/Makefile.in b/libnetdata/health/Makefile.in
deleted file mode 100644
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+++ /dev/null
@@ -1,518 +0,0 @@
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diff --git a/libnetdata/health/health.c b/libnetdata/health/health.c
index e03538db3..74f7a0266 100644
--- a/libnetdata/health/health.c
+++ b/libnetdata/health/health.c
@@ -1,5 +1,7 @@
 #include "health.h"
 
+SILENCERS *silencers;
+
 /**
  * Create Silencer
  *
@@ -136,8 +138,8 @@ int health_silencers_json_read_callback(JSON_ENTRY *e)
                 else if (!strcmp(e->data.string,"DISABLE")) silencers->stype = STYPE_DISABLE_ALARMS;
             } else {
                 debug(D_HEALTH, "JSON: Adding %s=%s", e->name, e->data.string);
-                SILENCER *test = health_silencers_addparam(e->callback_data, e->name, e->data.string);
-                (void)test;
+                if (e->callback_data)
+                    (void)health_silencers_addparam(e->callback_data, e->name, e->data.string);
             }
             break;
 
diff --git a/libnetdata/health/health.h b/libnetdata/health/health.h
index a3dc0775f..f7580edab 100644
--- a/libnetdata/health/health.h
+++ b/libnetdata/health/health.h
@@ -44,7 +44,7 @@ typedef struct silencers {
     SILENCER *silencers;
 } SILENCERS;
 
-SILENCERS *silencers;
+extern SILENCERS *silencers;
 
 extern SILENCER *create_silencer(void);
 extern int health_silencers_json_read_callback(JSON_ENTRY *e);
diff --git a/libnetdata/inlined.h b/libnetdata/inlined.h
index 6a5994c12..6f236b8f4 100644
--- a/libnetdata/inlined.h
+++ b/libnetdata/inlined.h
@@ -246,6 +246,26 @@ static inline char *strncpyz(char *dst, const char *src, size_t n) {
     return p;
 }
 
+static inline void sanitize_json_string(char *dst, char *src, size_t len) {
+    while (*src != '\0' && len > 1) {
+        if (*src == '\\' || *src == '\"' || *src < 0x1F) {
+            if (*src < 0x1F) {
+                *dst++ = '_';
+                src++;
+                len--;
+            } else {
+                *dst++ = '\\';
+                *dst++ = *src++;
+                len -= 2;
+            }
+        } else {
+            *dst++ = *src++;
+            len--;
+        }
+    }
+    *dst = '\0';
+}
+
 static inline int read_file(const char *filename, char *buffer, size_t size) {
     if(unlikely(!size)) return 3;
 
diff --git a/libnetdata/json/Makefile.in b/libnetdata/json/Makefile.in
deleted file mode 100644
index 8c0d135f4..000000000
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+++ /dev/null
@@ -1,519 +0,0 @@
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-    $(NULL)
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-	  case '$(am__configure_deps)' in \
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-	        && { if test -f $@; then exit 0; else break; fi; }; \
-	      exit 1;; \
-	  esac; \
-	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu libnetdata/json/Makefile'; \
-	$(am__cd) $(top_srcdir) && \
-	  $(AUTOMAKE) --gnu libnetdata/json/Makefile
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-	@case '$?' in \
-	  *config.status*) \
-	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
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diff --git a/libnetdata/json/README.md b/libnetdata/json/README.md
index e723cede0..79a48e240 100644
--- a/libnetdata/json/README.md
+++ b/libnetdata/json/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "json"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/json/README.md
+-->
+
 # json
 
 `json` contains a parser for json strings, based on `jsmn` (<https://github.com/zserge/jsmn>), but case you have installed the JSON-C library, the installation script will prefer it, you can also force its use with `--enable-jsonc` in the compilation time.
diff --git a/libnetdata/json/json.c b/libnetdata/json/json.c
index 3ccc561c6..bd164aeff 100644
--- a/libnetdata/json/json.c
+++ b/libnetdata/json/json.c
@@ -137,10 +137,12 @@ int json_callback_print(JSON_ENTRY *e)
  * @param e the output structure
  */
 static inline void json_jsonc_set_string(JSON_ENTRY *e,char *key,const char *value) {
-    size_t length = strlen(key);
+    size_t len = strlen(key);
+    if(len > JSON_NAME_LEN)
+        len = JSON_NAME_LEN;
     e->type = JSON_STRING;
-    memcpy(e->name,key,length);
-    e->name[length] = 0x00;
+    memcpy(e->name,key,len);
+    e->name[len] = 0x00;
     e->data.string = (char *) value;
 }
 
@@ -159,6 +161,16 @@ static inline void json_jsonc_set_boolean(JSON_ENTRY *e,int value) {
     e->data.boolean = value;
 }
 
+static inline void json_jsonc_set_integer(JSON_ENTRY *e, char *key, int64_t value) {
+    size_t len = strlen(key);
+    if(len > JSON_NAME_LEN)
+        len = JSON_NAME_LEN;
+    e->type = JSON_NUMBER;
+    memcpy(e->name, key, len);
+    e->name[len] = 0;
+    e->data.number = value;
+}
+
 /**
  * Parse Array
  *
@@ -299,7 +311,7 @@ size_t json_walk_array(char *js, jsmntok_t *t, size_t nest, size_t start, JSON_E
     memcpy(&ne, e, sizeof(JSON_ENTRY));
     ne.type = JSON_ARRAY;
     ne.data.items = t[start].size;
-    ne.callback_function = NULL;
+    ne.callback_function = e->callback_function;
     ne.name[0]='\0';
     ne.fullname[0]='\0';
     if(e->callback_function) e->callback_function(&ne);
@@ -365,7 +377,7 @@ size_t json_walk_object(char *js, jsmntok_t *t, size_t nest, size_t start, JSON_
     ne.original_string = &js[t[start].start];
     memcpy(&ne, e, sizeof(JSON_ENTRY));
     ne.type = JSON_OBJECT;
-    ne.callback_function = NULL;
+    ne.callback_function = e->callback_function;
     if(e->callback_function) e->callback_function(&ne);
     js[t[start].end] = old;
 
@@ -447,6 +459,9 @@ size_t json_walk(json_object *t, void *callback_data, int (*callback_function)(s
         } else if (type == json_type_boolean) {
             json_jsonc_set_boolean(&e,json_object_get_boolean(val));
             callback_function(&e);
+        } else if (type == json_type_int) {
+            json_jsonc_set_integer(&e,key,json_object_get_int64(val));
+            callback_function(&e);
         }
     }
 
diff --git a/libnetdata/libnetdata.c b/libnetdata/libnetdata.c
index 095c38c25..c9b7ab198 100644
--- a/libnetdata/libnetdata.c
+++ b/libnetdata/libnetdata.c
@@ -168,6 +168,7 @@ char *strdupz(const char *s) {
     return t;
 }
 
+// If ptr is NULL, no operation is performed.
 void freez(void *ptr) {
     free(ptr);
 }
@@ -1452,3 +1453,41 @@ void recursive_config_double_dir_load(const char *user_path, const char *stock_p
     freez(udir);
     freez(sdir);
 }
+
+// Returns the number of bytes read from the file if file_size is not NULL.
+// The actual buffer has an extra byte set to zero (not included in the count).
+char *read_by_filename(char *filename, long *file_size)
+{
+    FILE *f = fopen(filename, "r");
+    if (!f)
+        return NULL;
+    if (fseek(f, 0, SEEK_END) < 0) {
+        fclose(f);
+        return NULL;
+    }
+    long size = ftell(f);
+    if (size <= 0 || fseek(f, 0, SEEK_END) < 0) {
+        fclose(f);
+        return NULL;
+    }
+    char *contents = callocz(size + 1, 1);
+    if (!contents) {
+        fclose(f);
+        return NULL;
+    }
+    if (fseek(f, 0, SEEK_SET) < 0) {
+        fclose(f);
+        freez(contents);
+        return NULL;
+    }
+    size_t res = fread(contents, 1, size, f);
+    if ( res != (size_t)size) {
+        freez(contents);
+        fclose(f);
+        return NULL;
+    }
+    fclose(f);
+    if (file_size)
+        *file_size = size;
+    return contents;
+}
diff --git a/libnetdata/libnetdata.h b/libnetdata/libnetdata.h
index 023ad2c2b..50568b5bc 100644
--- a/libnetdata/libnetdata.h
+++ b/libnetdata/libnetdata.h
@@ -3,6 +3,10 @@
 #ifndef NETDATA_LIB_H
 #define NETDATA_LIB_H 1
 
+# ifdef __cplusplus
+extern "C" {
+# endif
+
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
@@ -83,6 +87,8 @@
 #include <unistd.h>
 #include <uuid/uuid.h>
 #include <spawn.h>
+#include <uv.h>
+#include <assert.h>
 
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
@@ -276,6 +282,7 @@ extern void recursive_config_double_dir_load(
         , void *data
         , size_t depth
 );
+extern char *read_by_filename(char *filename, long *file_size);
 
 /* fix for alpine linux */
 #ifndef RUSAGE_THREAD
@@ -286,6 +293,9 @@ extern void recursive_config_double_dir_load(
 
 #define BITS_IN_A_KILOBIT 1000
 
+/* misc. */
+#define UNUSED(x) (void)(x)
+#define error_report(x, args...) do { errno = 0; error(x, ##args); } while(0)
 
 extern void netdata_cleanup_and_exit(int ret) NORETURN;
 extern void send_statistics(const char *action, const char *action_result, const char *action_data);
@@ -295,6 +305,7 @@ extern char *netdata_configured_host_prefix;
 #include "threads/threads.h"
 #include "buffer/buffer.h"
 #include "locks/locks.h"
+#include "circular_buffer/circular_buffer.h"
 #include "avl/avl.h"
 #include "inlined.h"
 #include "clocks/clocks.h"
@@ -308,6 +319,9 @@ extern char *netdata_configured_host_prefix;
 #include "log/log.h"
 #include "procfile/procfile.h"
 #include "dictionary/dictionary.h"
+#ifdef HAVE_LIBBPF
+#include "ebpf/ebpf.h"
+#endif
 #include "eval/eval.h"
 #include "statistical/statistical.h"
 #include "adaptive_resortable_list/adaptive_resortable_list.h"
@@ -316,4 +330,11 @@ extern char *netdata_configured_host_prefix;
 #include "health/health.h"
 #include "string/utf8.h"
 
+// BEWARE: Outside of the C code this also exists in alarm-notify.sh
+#define DEFAULT_CLOUD_BASE_URL "https://app.netdata.cloud"
+
+# ifdef __cplusplus
+}
+# endif
+
 #endif // NETDATA_LIB_H
diff --git a/libnetdata/locks/Makefile.in b/libnetdata/locks/Makefile.in
deleted file mode 100644
index 78ee022d3..000000000
--- a/libnetdata/locks/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
-# Makefile.in generated by automake 1.15.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994-2017 Free Software Foundation, Inc.
-
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-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
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-
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-
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-am__is_gnu_make = { \
-  if test -z '$(MAKELEVEL)'; then \
-    false; \
-  elif test -n '$(MAKE_HOST)'; then \
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-    true; \
-  else \
-    false; \
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-}
-am__make_running_with_option = \
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-      ?) ;; \
-      *) echo "am__make_running_with_option: internal error: invalid" \
-              "target option '$${target_option-}' specified" >&2; \
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diff --git a/libnetdata/log/log.c b/libnetdata/log/log.c
index 7849aedc4..95d3d98d4 100644
--- a/libnetdata/log/log.c
+++ b/libnetdata/log/log.c
@@ -796,6 +796,8 @@ void fatal_int( const char *file, const char *function, const unsigned long line
     // save a copy of errno - just in case this function generates a new error
     int __errno = errno;
     va_list args;
+    const char *thread_tag;
+    char os_threadname[NETDATA_THREAD_NAME_MAX + 1];
 
     if(error_log_syslog) {
         va_start( args, fmt );
@@ -803,14 +805,22 @@ void fatal_int( const char *file, const char *function, const unsigned long line
         va_end( args );
     }
 
+    thread_tag = netdata_thread_tag();
+    if (!netdata_thread_tag_exists()) {
+        os_thread_get_current_name_np(os_threadname);
+        if ('\0' != os_threadname[0]) { /* If it is not an empty string replace "MAIN" thread_tag */
+            thread_tag = os_threadname;
+        }
+    }
+
     char date[LOG_DATE_LENGTH];
     log_date(date, LOG_DATE_LENGTH);
 
     log_lock();
 
     va_start( args, fmt );
-    if(debug_flags) fprintf(stderr, "%s: %s FATAL : %s : (%04lu@%-10.10s:%-15.15s): ", date, program_name, netdata_thread_tag(), line, file, function);
-    else            fprintf(stderr, "%s: %s FATAL : %s :", date, program_name, netdata_thread_tag());
+    if(debug_flags) fprintf(stderr, "%s: %s FATAL : %s : (%04lu@%-10.10s:%-15.15s): ", date, program_name, thread_tag, line, file, function);
+    else            fprintf(stderr, "%s: %s FATAL : %s : ", date, program_name, thread_tag);
     vfprintf( stderr, fmt, args );
     va_end( args );
 
@@ -820,10 +830,11 @@ void fatal_int( const char *file, const char *function, const unsigned long line
     log_unlock();
 
     char action_data[70+1];
-	snprintfz(action_data, 70, "%04lu@%-10.10s:%-15.15s/%d", line, file, function, __errno);
-	char action_result[60+1];
-	snprintfz(action_result, 60, "%s:%s",program_name, strcmp(program_name,"STREAM_RECEIVER")?netdata_thread_tag():"[x]");
-	send_statistics("FATAL", action_result, action_data);
+    snprintfz(action_data, 70, "%04lu@%-10.10s:%-15.15s/%d", line, file, function, __errno);
+    char action_result[60+1];
+
+    snprintfz(action_result, 60, "%s:%s", program_name, strncmp(thread_tag, "STREAM_RECEIVER", strlen("STREAM_RECEIVER")) ? thread_tag : "[x]");
+    send_statistics("FATAL", action_result, action_data);
 
     netdata_cleanup_and_exit(1);
 }
diff --git a/libnetdata/log/log.h b/libnetdata/log/log.h
index 1522ef9aa..c99c15165 100644
--- a/libnetdata/log/log.h
+++ b/libnetdata/log/log.h
@@ -3,6 +3,10 @@
 #ifndef NETDATA_LOG_H
 #define NETDATA_LOG_H 1
 
+# ifdef __cplusplus
+extern "C" {
+# endif
+
 #include "../libnetdata.h"
 
 #define D_WEB_BUFFER        0x0000000000000001
@@ -37,6 +41,9 @@
 #define D_POLLFD            0x0000000020000000
 #define D_STREAM            0x0000000040000000
 #define D_RRDENGINE         0x0000000100000000
+#define D_ACLK              0x0000000200000000
+#define D_METADATALOG       0x0000000400000000
+#define D_GUIDLOG           0x0000000800000000
 #define D_SYSTEM            0x8000000000000000
 
 //#define DEBUG (D_WEB_CLIENT_ACCESS|D_LISTENER|D_RRD_STATS)
@@ -86,6 +93,7 @@ static inline void debug_dummy(void) {}
 #define infoerr(args...) error_int("INFO", __FILE__, __FUNCTION__, __LINE__, ##args)
 #define error(args...)   error_int("ERROR", __FILE__, __FUNCTION__, __LINE__, ##args)
 #define fatal(args...)   fatal_int(__FILE__, __FUNCTION__, __LINE__, ##args)
+#define fatal_assert(expr) ((expr) ? (void)(0) : fatal_int(__FILE__, __FUNCTION__, __LINE__, "Assertion `%s' failed", #expr))
 
 extern void send_statistics(const char *action, const char *action_result, const char *action_data);
 extern void debug_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... ) PRINTFLIKE(4, 5);
@@ -94,4 +102,8 @@ extern void error_int( const char *prefix, const char *file, const char *functio
 extern void fatal_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... ) NORETURN PRINTFLIKE(4, 5);
 extern void log_access( const char *fmt, ... ) PRINTFLIKE(1, 2);
 
+# ifdef __cplusplus
+}
+# endif
+
 #endif /* NETDATA_LOG_H */
diff --git a/libnetdata/os.c b/libnetdata/os.c
index 0248eb627..4271a917c 100644
--- a/libnetdata/os.c
+++ b/libnetdata/os.c
@@ -215,4 +215,3 @@ int getsysctl_by_name(const char *name, void *ptr, size_t len) {
 }
 
 #endif // (TARGET_OS == OS_MACOS)
-
diff --git a/libnetdata/popen/Makefile.in b/libnetdata/popen/Makefile.in
deleted file mode 100644
index 845f99385..000000000
--- a/libnetdata/popen/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
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-# @configure_input@
-
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-
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-# with or without modifications, as long as this notice is preserved.
-
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-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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-
-
-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/libnetdata/popen/popen.c b/libnetdata/popen/popen.c
index 1c4ae64d6..c0135cf40 100644
--- a/libnetdata/popen/popen.c
+++ b/libnetdata/popen/popen.c
@@ -78,8 +78,16 @@ static void myp_del(pid_t pid) {
 #define PIPE_READ 0
 #define PIPE_WRITE 1
 
-static inline FILE *custom_popene(const char *command, volatile pid_t *pidptr, char **env) {
-    FILE *fp;
+/* custom_popene flag definitions */
+#define FLAG_CREATE_PIPE    1 // Create a pipe like popen() when set, otherwise set stdout to /dev/null
+#define FLAG_CLOSE_FD       2 // Close all file descriptors other than STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO
+
+/*
+ * Returns -1 on failure, 0 on success. When FLAG_CREATE_PIPE is set, on success set the FILE *fp pointer.
+ */
+static inline int custom_popene(const char *command, volatile pid_t *pidptr, char **env, uint8_t flags, FILE **fpp) {
+    FILE *fp = NULL;
+    int ret = 0; // success by default
     int pipefd[2], error;
     pid_t pid;
     char *const spawn_argv[] = {
@@ -91,23 +99,36 @@ static inline FILE *custom_popene(const char *command, volatile pid_t *pidptr, c
     posix_spawnattr_t attr;
     posix_spawn_file_actions_t fa;
 
-    if (pipe(pipefd) == -1)
-        return NULL;
-    if ((fp = fdopen(pipefd[PIPE_READ], "r")) == NULL) {
-        goto error_after_pipe;
+    if (flags & FLAG_CREATE_PIPE) {
+        if (pipe(pipefd) == -1)
+            return -1;
+        if ((fp = fdopen(pipefd[PIPE_READ], "r")) == NULL) {
+            goto error_after_pipe;
+        }
     }
 
-    // Mark all files to be closed by the exec() stage of posix_spawn()
-    int i;
-    for (i = (int) (sysconf(_SC_OPEN_MAX) - 1); i >= 0; i--)
-        if(i != STDIN_FILENO && i != STDERR_FILENO)
-            (void)fcntl(i, F_SETFD, FD_CLOEXEC);
+    if (flags & FLAG_CLOSE_FD) {
+        // Mark all files to be closed by the exec() stage of posix_spawn()
+        int i;
+        for (i = (int) (sysconf(_SC_OPEN_MAX) - 1); i >= 0; i--) {
+            if (i != STDIN_FILENO && i != STDERR_FILENO)
+                (void) fcntl(i, F_SETFD, FD_CLOEXEC);
+        }
+    }
 
     if (!posix_spawn_file_actions_init(&fa)) {
-        // move the pipe to stdout in the child
-        if (posix_spawn_file_actions_adddup2(&fa, pipefd[PIPE_WRITE], STDOUT_FILENO)) {
-            error("posix_spawn_file_actions_adddup2() failed");
-            goto error_after_posix_spawn_file_actions_init;
+        if (flags & FLAG_CREATE_PIPE) {
+            // move the pipe to stdout in the child
+            if (posix_spawn_file_actions_adddup2(&fa, pipefd[PIPE_WRITE], STDOUT_FILENO)) {
+                error("posix_spawn_file_actions_adddup2() failed");
+                goto error_after_posix_spawn_file_actions_init;
+            }
+        } else {
+            // set stdout to /dev/null
+            if (posix_spawn_file_actions_addopen(&fa, STDOUT_FILENO, "/dev/null", O_WRONLY, 0)) {
+                error("posix_spawn_file_actions_addopen() failed");
+                // this is not a fatal error
+            }
         }
     } else {
         error("posix_spawn_file_actions_init() failed.");
@@ -136,10 +157,16 @@ static inline FILE *custom_popene(const char *command, volatile pid_t *pidptr, c
     } else {
         myp_add_unlock();
         error("Failed to spawn command: '%s' from parent pid %d.", command, getpid());
-        fclose(fp);
-        fp = NULL;
+        if (flags & FLAG_CREATE_PIPE) {
+            fclose(fp);
+        }
+        ret = -1;
+    }
+    if (flags & FLAG_CREATE_PIPE) {
+        close(pipefd[PIPE_WRITE]);
+        if (0 == ret) // on success set FILE * pointer
+            *fpp = fp;
     }
-    close(pipefd[PIPE_WRITE]);
 
     if (!error) {
         // posix_spawnattr_init() succeeded
@@ -149,19 +176,21 @@ static inline FILE *custom_popene(const char *command, volatile pid_t *pidptr, c
     if (posix_spawn_file_actions_destroy(&fa))
         error("posix_spawn_file_actions_destroy");
 
-    return fp;
+    return ret;
 
 error_after_posix_spawn_file_actions_init:
     if (posix_spawn_file_actions_destroy(&fa))
         error("posix_spawn_file_actions_destroy");
 error_after_pipe:
-    if (fp)
-        fclose(fp);
-    else
-        close(pipefd[PIPE_READ]);
+    if (flags & FLAG_CREATE_PIPE) {
+        if (fp)
+            fclose(fp);
+        else
+            close(pipefd[PIPE_READ]);
 
-    close(pipefd[PIPE_WRITE]);
-    return NULL;
+        close(pipefd[PIPE_WRITE]);
+    }
+    return -1;
 }
 
 // See man environ
@@ -222,26 +251,37 @@ int myp_reap(pid_t pid) {
 }
 
 FILE *mypopen(const char *command, volatile pid_t *pidptr) {
-    return custom_popene(command, pidptr, environ);
+    FILE *fp = NULL;
+    (void)custom_popene(command, pidptr, environ, FLAG_CREATE_PIPE | FLAG_CLOSE_FD, &fp);
+    return fp;
 }
 
 FILE *mypopene(const char *command, volatile pid_t *pidptr, char **env) {
-    return custom_popene(command, pidptr, env);
+    FILE *fp = NULL;
+    (void)custom_popene(command, pidptr, env, FLAG_CREATE_PIPE | FLAG_CLOSE_FD, &fp);
+    return fp;
+}
+
+// returns 0 on success, -1 on failure
+int netdata_spawn(const char *command, volatile pid_t *pidptr) {
+    return custom_popene(command, pidptr, environ, 0, NULL);
 }
 
-int mypclose(FILE *fp, pid_t pid) {
+int custom_pclose(FILE *fp, pid_t pid) {
     int ret;
     siginfo_t info;
 
     debug(D_EXIT, "Request to mypclose() on pid %d", pid);
 
-    // close the pipe fd
-    // this is required in musl
-    // without it the childs do not exit
-    close(fileno(fp));
+    if (fp) {
+        // close the pipe fd
+        // this is required in musl
+        // without it the childs do not exit
+        close(fileno(fp));
 
-    // close the pipe file pointer
-    fclose(fp);
+        // close the pipe file pointer
+        fclose(fp);
+    }
 
     errno = 0;
 
@@ -285,3 +325,13 @@ int mypclose(FILE *fp, pid_t pid) {
     
     return 0;
 }
+
+int mypclose(FILE *fp, pid_t pid)
+{
+    return custom_pclose(fp, pid);
+}
+
+int netdata_spawn_waitpid(pid_t pid)
+{
+    return custom_pclose(NULL, pid);
+}
\ No newline at end of file
diff --git a/libnetdata/popen/popen.h b/libnetdata/popen/popen.h
index 32f64e460..f387cff0a 100644
--- a/libnetdata/popen/popen.h
+++ b/libnetdata/popen/popen.h
@@ -11,6 +11,8 @@
 extern FILE *mypopen(const char *command, volatile pid_t *pidptr);
 extern FILE *mypopene(const char *command, volatile pid_t *pidptr, char **env);
 extern int mypclose(FILE *fp, pid_t pid);
+extern int netdata_spawn(const char *command, volatile pid_t *pidptr);
+extern int netdata_spawn_waitpid(pid_t pid);
 extern void myp_init(void);
 extern void myp_free(void);
 extern int myp_reap(pid_t pid);
diff --git a/libnetdata/procfile/Makefile.in b/libnetdata/procfile/Makefile.in
deleted file mode 100644
index 89fb26d3a..000000000
--- a/libnetdata/procfile/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
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diff --git a/libnetdata/procfile/README.md b/libnetdata/procfile/README.md
index 7487e6c63..3eeb1e205 100644
--- a/libnetdata/procfile/README.md
+++ b/libnetdata/procfile/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "PROCFILE"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/procfile/README.md
+-->
+
 # PROCFILE
 
 procfile is a library for reading text data files (i.e `/proc` files) in the fastest possible way.
@@ -23,9 +28,9 @@ For each iteration, the caller:
 -   calls `procfile_readall()` to read updated contents.
      This call also rewinds (`lseek()` to 0) before reading it.
 
-     For every file, a [BUFFER](../buffer/) is used that is automatically adjusted to fit
-     the entire file contents of the file. So the file is read with a single `read()` call
-     (providing atomicity / consistency when the data are read from the kernel).
+     For every file, a [BUFFER](/libnetdata/buffer/README.md) is used that is automatically adjusted to fit the entire
+     file contents of the file. So the file is read with a single `read()` call (providing atomicity / consistency when
+     the data are read from the kernel).
 
      Once the data are read, 2 arrays of pointers are updated:
 
diff --git a/libnetdata/simple_pattern/Makefile.in b/libnetdata/simple_pattern/Makefile.in
deleted file mode 100644
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diff --git a/libnetdata/simple_pattern/README.md b/libnetdata/simple_pattern/README.md
index 53ed947e9..a90759c3a 100644
--- a/libnetdata/simple_pattern/README.md
+++ b/libnetdata/simple_pattern/README.md
@@ -1,4 +1,10 @@
-## Netdata simple patterns
+<!--
+title: "Netdata simple patterns"
+description: "Netdata supports simple patterns, which are less cryptic versions of regular expressions. Use familiar notation for powerful results."
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/simple_pattern/README.md
+-->
+
+# Netdata simple patterns
 
 Unix prefers regular expressions. But they are just too hard, too cryptic
 to use, write and understand.
diff --git a/libnetdata/simple_pattern/simple_pattern.c b/libnetdata/simple_pattern/simple_pattern.c
index ab4b9de3c..70b06a22b 100644
--- a/libnetdata/simple_pattern/simple_pattern.c
+++ b/libnetdata/simple_pattern/simple_pattern.c
@@ -331,3 +331,35 @@ extern int simple_pattern_is_potential_name(SIMPLE_PATTERN *p)
     }
     return (alpha || wildcards) && !colon;
 }
+
+char *simple_pattern_trim_around_equal(char *src) {
+    char *store = mallocz(strlen(src) +1);
+    if(!store)
+        return NULL;
+
+    char *dst = store;
+    while (*src) {
+        if (*src == '=') {
+            if (*(dst -1) == ' ')
+                dst--;
+
+            *dst++ = *src++;
+            if (*src == ' ')
+                src++;
+        }
+
+        *dst++ = *src++;
+    }
+    *dst = 0x00;
+
+    return store;
+}
+
+char *simple_pattern_iterate(SIMPLE_PATTERN **p)
+{
+    struct simple_pattern *root = (struct simple_pattern *) *p;
+    struct simple_pattern **Proot = (struct simple_pattern **)p;
+
+    (*Proot) = (*Proot)->next;
+    return (char *) root->match;
+}
diff --git a/libnetdata/simple_pattern/simple_pattern.h b/libnetdata/simple_pattern/simple_pattern.h
index cb5e7699d..36fbbde7d 100644
--- a/libnetdata/simple_pattern/simple_pattern.h
+++ b/libnetdata/simple_pattern/simple_pattern.h
@@ -32,5 +32,9 @@ extern void simple_pattern_free(SIMPLE_PATTERN *list);
 
 extern void simple_pattern_dump(uint64_t debug_type, SIMPLE_PATTERN *p) ;
 extern int simple_pattern_is_potential_name(SIMPLE_PATTERN *p) ;
+extern char *simple_pattern_iterate(SIMPLE_PATTERN **p);
+
+//Auxiliary function to create a pattern
+char *simple_pattern_trim_around_equal(char *src);
 
 #endif //NETDATA_SIMPLE_PATTERN_H
diff --git a/libnetdata/socket/Makefile.in b/libnetdata/socket/Makefile.in
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-
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-	@echo "it deletes files that may require special tools to rebuild."
-	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
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-
-clean-am: clean-generic mostlyclean-am
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-distclean: distclean-am
-	-rm -f Makefile
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diff --git a/libnetdata/socket/security.c b/libnetdata/socket/security.c
index ab324a169..53366c4d8 100644
--- a/libnetdata/socket/security.c
+++ b/libnetdata/socket/security.c
@@ -2,11 +2,13 @@
 
 #ifdef ENABLE_HTTPS
 
-SSL_CTX *netdata_opentsdb_ctx=NULL;
+SSL_CTX *netdata_exporting_ctx=NULL;
 SSL_CTX *netdata_client_ctx=NULL;
 SSL_CTX *netdata_srv_ctx=NULL;
 const char *security_key=NULL;
 const char *security_cert=NULL;
+const char *tls_version=NULL;
+const char *tls_ciphers=NULL;
 int netdata_validate_server =  NETDATA_SSL_VALID_CERTIFICATE;
 
 /**
@@ -32,14 +34,12 @@ static void security_info_callback(const SSL *ssl, int where, int ret __maybe_un
  */
 void security_openssl_library()
 {
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
-# if (SSLEAY_VERSION_NUMBER >= 0x0907000L)
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
+# if (SSLEAY_VERSION_NUMBER >= OPENSSL_VERSION_097)
     OPENSSL_config(NULL);
 # endif
 
-# if OPENSSL_API_COMPAT < 0x10100000L
     SSL_load_error_strings();
-# endif
 
     SSL_library_init();
 #else
@@ -49,32 +49,64 @@ void security_openssl_library()
 #endif
 }
 
+#if OPENSSL_VERSION_NUMBER >= OPENSSL_VERSION_110
+/**
+ * TLS version
+ *
+ * Returns the TLS version depending of the user input.
+ *
+ * @param lversion is the user input.
+ *
+ * @return it returns the version number.
+ */
+int tls_select_version(const char *lversion) {
+    if (!strcmp(lversion, "1") || !strcmp(lversion, "1.0"))
+        return TLS1_VERSION;
+    else if (!strcmp(lversion, "1.1"))
+        return TLS1_1_VERSION;
+    else if (!strcmp(lversion, "1.2"))
+        return TLS1_2_VERSION;
+#if defined(TLS1_3_VERSION)
+    else if (!strcmp(lversion, "1.3"))
+        return TLS1_3_VERSION;
+#endif
+
+#if defined(TLS_MAX_VERSION)
+    return TLS_MAX_VERSION;
+#else
+    return TLS1_2_VERSION;
+#endif
+}
+#endif
+
 /**
  * OpenSSL common options
  *
  * Clients and SERVER have common options, this function is responsible to set them in the context.
  *
- * @param ctx
+ * @param ctx the initialized SSL context.
+ * @param side 0 means server, and 1 client.
  */
-void security_openssl_common_options(SSL_CTX *ctx) {
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
-    static char *ciphers = {"ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA"};
+void security_openssl_common_options(SSL_CTX *ctx, int side) {
+#if OPENSSL_VERSION_NUMBER >= OPENSSL_VERSION_110
+    if (!side) {
+        int version =  tls_select_version(tls_version) ;
 #endif
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
-    SSL_CTX_set_options (ctx,SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_COMPRESSION);
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
+        SSL_CTX_set_options (ctx,SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_COMPRESSION);
 #else
-    SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION);
-    //We are avoiding the TLS v1.3 for while, because Google Chrome
-    //is giving the message net::ERR_SSL_VERSION_INTERFERENCE with it.
-    SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION);
-#endif
-    SSL_CTX_set_mode(ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
+        SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
+        SSL_CTX_set_max_proto_version(ctx, version);
 
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
-    if (!SSL_CTX_set_cipher_list(ctx, ciphers)) {
-        error("SSL error. cannot set the cipher list");
+        if(tls_ciphers  && strcmp(tls_ciphers, "none") != 0) {
+            if (!SSL_CTX_set_cipher_list(ctx, tls_ciphers)) {
+                error("SSL error. cannot set the cipher list");
+            }
+        }
     }
 #endif
+
+    SSL_CTX_set_mode(ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 }
 
 /**
@@ -84,15 +116,26 @@ void security_openssl_common_options(SSL_CTX *ctx) {
  *
  * @return It returns the context on success or NULL otherwise
  */
-static SSL_CTX * security_initialize_openssl_client() {
+SSL_CTX * security_initialize_openssl_client() {
     SSL_CTX *ctx;
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
     ctx = SSL_CTX_new(SSLv23_client_method());
 #else
     ctx = SSL_CTX_new(TLS_client_method());
 #endif
     if(ctx) {
-        security_openssl_common_options(ctx);
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
+        SSL_CTX_set_options (ctx,SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_COMPRESSION);
+#else
+        SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
+# if defined(TLS_MAX_VERSION)
+        SSL_CTX_set_max_proto_version(ctx, TLS_MAX_VERSION);
+# elif defined(TLS1_3_VERSION)
+        SSL_CTX_set_max_proto_version(ctx, TLS1_3_VERSION);
+# elif defined(TLS1_2_VERSION)
+        SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION);
+# endif
+#endif
     }
 
     return ctx;
@@ -111,7 +154,7 @@ static SSL_CTX * security_initialize_openssl_server() {
 	static int netdata_id_context = 1;
 
     //TO DO: Confirm the necessity to check return for other OPENSSL function
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
 	ctx = SSL_CTX_new(SSLv23_server_method());
     if (!ctx) {
 		error("Cannot create a new SSL context, netdata won't encrypt communication");
@@ -128,7 +171,7 @@ static SSL_CTX * security_initialize_openssl_server() {
 
     SSL_CTX_use_certificate_chain_file(ctx, security_cert);
 #endif
-    security_openssl_common_options(ctx);
+    security_openssl_common_options(ctx, 0);
 
     SSL_CTX_use_PrivateKey_file(ctx,security_key,SSL_FILETYPE_PEM);
 
@@ -142,7 +185,7 @@ static SSL_CTX * security_initialize_openssl_server() {
 	SSL_CTX_set_session_id_context(ctx,(void*)&netdata_id_context,(unsigned int)sizeof(netdata_id_context));
     SSL_CTX_set_info_callback(ctx,security_info_callback);
 
-#if (OPENSSL_VERSION_NUMBER < 0x00905100L)
+#if (OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_095)
 	SSL_CTX_set_verify_depth(ctx,1);
 #endif
     debug(D_WEB_CLIENT,"SSL GLOBAL CONTEXT STARTED\n");
@@ -158,7 +201,7 @@ static SSL_CTX * security_initialize_openssl_server() {
  * @param selector informs the context that must be initialized, the following list has the valid values:
  *      NETDATA_SSL_CONTEXT_SERVER - the server context
  *      NETDATA_SSL_CONTEXT_STREAMING - Starts the streaming context.
- *      NETDATA_SSL_CONTEXT_OPENTSDB - Starts the OpenTSDB contextv
+ *      NETDATA_SSL_CONTEXT_EXPORTING - Starts the OpenTSDB contextv
  */
 void security_start_ssl(int selector) {
     switch (selector) {
@@ -179,8 +222,8 @@ void security_start_ssl(int selector) {
             SSL_CTX_set_mode(netdata_client_ctx, SSL_MODE_ENABLE_PARTIAL_WRITE |SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |SSL_MODE_AUTO_RETRY);
             break;
         }
-        case NETDATA_SSL_CONTEXT_OPENTSDB: {
-            netdata_opentsdb_ctx = security_initialize_openssl_client();
+        case NETDATA_SSL_CONTEXT_EXPORTING: {
+            netdata_exporting_ctx = security_initialize_openssl_client();
             break;
         }
     }
@@ -191,23 +234,21 @@ void security_start_ssl(int selector) {
  *
  * Clean all the allocated contexts from netdata.
  */
-void security_clean_openssl() {
-	if (netdata_srv_ctx)
-	{
-		SSL_CTX_free(netdata_srv_ctx);
-	}
+void security_clean_openssl()
+{
+    if (netdata_srv_ctx) {
+        SSL_CTX_free(netdata_srv_ctx);
+    }
 
-    if (netdata_client_ctx)
-    {
+    if (netdata_client_ctx) {
         SSL_CTX_free(netdata_client_ctx);
     }
 
-    if ( netdata_opentsdb_ctx )
-    {
-        SSL_CTX_free(netdata_opentsdb_ctx);
+    if (netdata_exporting_ctx) {
+        SSL_CTX_free(netdata_exporting_ctx);
     }
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
     ERR_free_strings();
 #endif
 }
@@ -273,7 +314,7 @@ int security_process_accept(SSL *ssl,int msg) {
 /**
  * Test Certificate
  *
- * Check the certificate of Netdata master
+ * Check the certificate of Netdata parent
  *
  * @param ssl is the connection structure
  *
@@ -305,10 +346,10 @@ int security_test_certificate(SSL *ssl) {
  * Location for context
  *
  * Case the user give us a directory with the certificates available and
- * the Netdata master certificate, we use this function to validate the certificate.
+ * the Netdata parent certificate, we use this function to validate the certificate.
  *
  * @param ctx the context where the path will be set.
- * @param file the file with Netdata master certificate.
+ * @param file the file with Netdata parent certificate.
  * @param path the directory where the certificates are stored.
  *
  * @return It returns 0 on success and -1 otherwise.
@@ -316,7 +357,7 @@ int security_test_certificate(SSL *ssl) {
 int security_location_for_context(SSL_CTX *ctx, char *file, char *path) {
     struct stat statbuf;
     if (stat(file, &statbuf)) {
-        info("Netdata does not have a SSL master certificate, so it will use the default OpenSSL configuration to validate certificates!");
+        info("Netdata does not have the parent's SSL certificate, so it will use the default OpenSSL configuration to validate certificates!");
         return 0;
     }
 
@@ -336,7 +377,7 @@ int security_location_for_context(SSL_CTX *ctx, char *file, char *path) {
 slfc:
     while ((err = ERR_get_error()) != 0) {
         ERR_error_string_n(err, buf, sizeof(buf));
-        error("Cannot set the directory for the certificates and the master SSL certificate: %s",buf);
+        error("Cannot set the directory for the certificates and the parent SSL certificate: %s",buf);
     }
     return -1;
 }
diff --git a/libnetdata/socket/security.h b/libnetdata/socket/security.h
index 697e0fda1..17ecc6d05 100644
--- a/libnetdata/socket/security.h
+++ b/libnetdata/socket/security.h
@@ -10,29 +10,37 @@
 # define NETDATA_SSL_FORCE 32                //We only accepts HTTPS request
 # define NETDATA_SSL_INVALID_CERTIFICATE 64  //Accepts invalid certificate
 # define NETDATA_SSL_VALID_CERTIFICATE 128  //Accepts invalid certificate
+# define NETDATA_SSL_PROXY_HTTPS 256        //Proxy is using HTTPS
 
 #define NETDATA_SSL_CONTEXT_SERVER 0
 #define NETDATA_SSL_CONTEXT_STREAMING 1
-#define NETDATA_SSL_CONTEXT_OPENTSDB 2
+#define NETDATA_SSL_CONTEXT_EXPORTING 2
 
 # ifdef ENABLE_HTTPS
 
+#define OPENSSL_VERSION_095 0x00905100L
+#define OPENSSL_VERSION_097 0x0907000L
+#define OPENSSL_VERSION_110 0x10100000L
+#define OPENSSL_VERSION_111 0x10101000L
+
 #  include <openssl/ssl.h>
 #  include <openssl/err.h>
-#  if (SSLEAY_VERSION_NUMBER >= 0x0907000L) && (OPENSSL_VERSION_NUMBER < 0x10100000L)
+#  if (SSLEAY_VERSION_NUMBER >= OPENSSL_VERSION_097) && (OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110)
 #   include <openssl/conf.h>
 #  endif
 
 struct netdata_ssl{
     SSL *conn; //SSL connection
-    int flags; //The flags for SSL connection
+    uint32_t flags; //The flags for SSL connection
 };
 
-extern SSL_CTX *netdata_opentsdb_ctx;
+extern SSL_CTX *netdata_exporting_ctx;
 extern SSL_CTX *netdata_client_ctx;
 extern SSL_CTX *netdata_srv_ctx;
 extern const char *security_key;
 extern const char *security_cert;
+extern const char *tls_version;
+extern const char *tls_ciphers;
 extern int netdata_validate_server;
 extern int security_location_for_context(SSL_CTX *ctx,char *file,char *path);
 
@@ -41,6 +49,7 @@ void security_clean_openssl();
 void security_start_ssl(int selector);
 int security_process_accept(SSL *ssl,int msg);
 int security_test_certificate(SSL *ssl);
+SSL_CTX * security_initialize_openssl_client();
 
 # endif //ENABLE_HTTPS
 #endif //NETDATA_SECURITY_H
diff --git a/libnetdata/socket/socket.c b/libnetdata/socket/socket.c
index 2289bf4c4..73eb8e662 100644
--- a/libnetdata/socket/socket.c
+++ b/libnetdata/socket/socket.c
@@ -607,7 +607,7 @@ static inline int connect_to_unix(const char *path, struct timeval *timeout) {
 // service     the service name or port to connect to
 // timeout     the timeout for establishing a connection
 
-static inline int connect_to_this_ip46(int protocol, int socktype, const char *host, uint32_t scope_id, const char *service, struct timeval *timeout) {
+int connect_to_this_ip46(int protocol, int socktype, const char *host, uint32_t scope_id, const char *service, struct timeval *timeout) {
     struct addrinfo hints;
     struct addrinfo *ai_head = NULL, *ai = NULL;
 
diff --git a/libnetdata/socket/socket.h b/libnetdata/socket/socket.h
index eb09b3f9a..a40d801dd 100644
--- a/libnetdata/socket/socket.h
+++ b/libnetdata/socket/socket.h
@@ -56,6 +56,7 @@ extern void listen_sockets_close(LISTEN_SOCKETS *sockets);
 
 extern int connect_to_this(const char *definition, int default_port, struct timeval *timeout);
 extern int connect_to_one_of(const char *destination, int default_port, struct timeval *timeout, size_t *reconnects_counter, char *connected_to, size_t connected_to_size);
+int connect_to_this_ip46(int protocol, int socktype, const char *host, uint32_t scope_id, const char *service, struct timeval *timeout);
 
 #ifdef ENABLE_HTTPS
 extern ssize_t recv_timeout(struct netdata_ssl *ssl,int sockfd, void *buf, size_t len, int flags, int timeout);
diff --git a/libnetdata/statistical/Makefile.in b/libnetdata/statistical/Makefile.in
deleted file mode 100644
index 25b2a9647..000000000
--- a/libnetdata/statistical/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
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-
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diff --git a/libnetdata/storage_number/README.md b/libnetdata/storage_number/README.md
index 9f6c08e06..295b3d6e7 100644
--- a/libnetdata/storage_number/README.md
+++ b/libnetdata/storage_number/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Netdata storage number"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/storage_number/README.md
+-->
+
 # Netdata storage number
 
 Although `netdata` does all its calculations using `long double`, it stores all values using
diff --git a/libnetdata/storage_number/storage_number.c b/libnetdata/storage_number/storage_number.c
index 6825fa7d0..8ef1353b0 100644
--- a/libnetdata/storage_number/storage_number.c
+++ b/libnetdata/storage_number/storage_number.c
@@ -61,6 +61,10 @@ storage_number pack_storage_number(calculated_number value, uint32_t flags) {
             m++;
         }
 
+        if (unlikely(n > (calculated_number) (0x00ffffff))) {
+            n /= 10;
+            m--;
+        }
         // the value was small enough and we multiplied it
         // so we add a divider to unpack it
         r += (0 << 30) + (m << 27); // the divider m
diff --git a/libnetdata/storage_number/tests/Makefile.in b/libnetdata/storage_number/tests/Makefile.in
deleted file mode 100644
index 6ee4bf0ab..000000000
--- a/libnetdata/storage_number/tests/Makefile.in
+++ /dev/null
@@ -1,512 +0,0 @@
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diff --git a/libnetdata/storage_number/tests/test_storage_number.c b/libnetdata/storage_number/tests/test_storage_number.c
index 61a0c1880..0e1320877 100644
--- a/libnetdata/storage_number/tests/test_storage_number.c
+++ b/libnetdata/storage_number/tests/test_storage_number.c
@@ -37,6 +37,9 @@ static void test_number_pinting(void **state)
 
     print_calculated_number(value, -9999.9999999);
     assert_string_equal(value, "-9999.9999999");
+
+    print_calculated_number(value, unpack_storage_number(pack_storage_number(16.777218L, SN_EXISTS)));
+    assert_string_equal(value, "16.77722");
 }
 
 int main(void)
diff --git a/libnetdata/tests/Makefile.in b/libnetdata/tests/Makefile.in
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diff --git a/libnetdata/threads/threads.c b/libnetdata/threads/threads.c
index 3b3f30415..d7636940f 100644
--- a/libnetdata/threads/threads.c
+++ b/libnetdata/threads/threads.c
@@ -18,8 +18,12 @@ typedef struct {
 
 static __thread NETDATA_THREAD *netdata_thread = NULL;
 
+inline int netdata_thread_tag_exists(void) {
+    return (netdata_thread && netdata_thread->tag && *netdata_thread->tag);
+}
+
 const char *netdata_thread_tag(void) {
-    return ((netdata_thread && netdata_thread->tag && *netdata_thread->tag)?netdata_thread->tag:"MAIN");
+    return (netdata_thread_tag_exists() ? netdata_thread->tag : "MAIN");
 }
 
 // ----------------------------------------------------------------------------
@@ -109,14 +113,13 @@ static void thread_cleanup(void *ptr) {
     netdata_thread = NULL;
 }
 
-static void thread_set_name(NETDATA_THREAD *nt) {
+static void thread_set_name_np(NETDATA_THREAD *nt) {
 
     if (nt->tag) {
         int ret = 0;
 
-        // Name is limited to 16 chars
-        char threadname[16];
-        strncpyz(threadname, nt->tag, 15);
+        char threadname[NETDATA_THREAD_NAME_MAX+1];
+        strncpyz(threadname, nt->tag, NETDATA_THREAD_NAME_MAX);
 
 #if defined(__FreeBSD__)
         pthread_set_name_np(pthread_self(), threadname);
@@ -134,6 +137,34 @@ static void thread_set_name(NETDATA_THREAD *nt) {
     }
 }
 
+void uv_thread_set_name_np(uv_thread_t ut, const char* name) {
+    int ret = 0;
+
+    char threadname[NETDATA_THREAD_NAME_MAX+1];
+    strncpyz(threadname, name, NETDATA_THREAD_NAME_MAX);
+
+#if defined(__FreeBSD__)
+    pthread_set_name_np(ut, threadname);
+#elif defined(__APPLE__)
+    // Apple can only set its own name
+#else
+    ret = pthread_setname_np(ut, threadname);
+#endif
+
+    if (ret)
+        info("cannot set libuv thread name to %s. Err: %d", threadname, ret);
+}
+
+void os_thread_get_current_name_np(char threadname[NETDATA_THREAD_NAME_MAX + 1])
+{
+    threadname[0] = '\0';
+#if defined(__FreeBSD__)
+    pthread_get_name_np(pthread_self(), threadname, NETDATA_THREAD_NAME_MAX + 1);
+#elif defined(HAVE_PTHREAD_GETNAME_NP) /* Linux & macOS */
+    (void)pthread_getname_np(pthread_self(), threadname, NETDATA_THREAD_NAME_MAX + 1);
+#endif
+}
+
 static void *thread_start(void *ptr) {
     netdata_thread = (NETDATA_THREAD *)ptr;
 
@@ -146,7 +177,7 @@ static void *thread_start(void *ptr) {
     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
         error("cannot set pthread cancel state to ENABLE.");
 
-    thread_set_name(ptr);
+    thread_set_name_np(ptr);
 
     void *ret = NULL;
     pthread_cleanup_push(thread_cleanup, ptr);
diff --git a/libnetdata/threads/threads.h b/libnetdata/threads/threads.h
index eec6ad0e3..e7d79d328 100644
--- a/libnetdata/threads/threads.h
+++ b/libnetdata/threads/threads.h
@@ -22,6 +22,7 @@ typedef pthread_t netdata_thread_t;
 
 #define NETDATA_THREAD_TAG_MAX 100
 extern const char *netdata_thread_tag(void);
+extern int netdata_thread_tag_exists(void);
 
 extern size_t netdata_threads_init(void);
 extern void netdata_threads_init_after_fork(size_t stacksize);
@@ -31,6 +32,10 @@ extern int netdata_thread_cancel(netdata_thread_t thread);
 extern int netdata_thread_join(netdata_thread_t thread, void **retval);
 extern int netdata_thread_detach(pthread_t thread);
 
+#define NETDATA_THREAD_NAME_MAX 15
+extern void uv_thread_set_name_np(uv_thread_t ut, const char* name);
+extern void os_thread_get_current_name_np(char threadname[NETDATA_THREAD_NAME_MAX + 1]);
+
 #define netdata_thread_self pthread_self
 #define netdata_thread_testcancel pthread_testcancel
 
diff --git a/libnetdata/url/Makefile.in b/libnetdata/url/Makefile.in
deleted file mode 100644
index ef0b5f7cf..000000000
--- a/libnetdata/url/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
-# Makefile.in generated by automake 1.15.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994-2017 Free Software Foundation, Inc.
-
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# SPDX-License-Identifier: GPL-3.0-or-later
-
-VPATH = @srcdir@
-am__is_gnu_make = { \
-  if test -z '$(MAKELEVEL)'; then \
-    false; \
-  elif test -n '$(MAKE_HOST)'; then \
-    true; \
-  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
-    true; \
-  else \
-    false; \
-  fi; \
-}
-am__make_running_with_option = \
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-.NOEXPORT:
diff --git a/libnetdata/url/url.c b/libnetdata/url/url.c
index d1d508139..3de94fde7 100644
--- a/libnetdata/url/url.c
+++ b/libnetdata/url/url.c
@@ -31,8 +31,11 @@ char *url_encode(char *str) {
         else if (*str == ' ')
             *pbuf++ = '+';
 
-        else
-            *pbuf++ = '%', *pbuf++ = to_hex(*str >> 4), *pbuf++ = to_hex(*str & 15);
+        else{
+            *pbuf++ = '%';
+            *pbuf++ = to_hex(*str >> 4);
+            *pbuf++ = to_hex(*str & 15);
+        }
 
         str++;
     }