Merging upstream version 1.34.0.

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

18 files changed, 395 insertions, 268 deletions

diff --git a/daemon/README.md b/daemon/README.md
index 1ea865f8..44abfa8e 100644
--- a/daemon/README.md
+++ b/daemon/README.md
@@ -254,57 +254,14 @@ where:
 
 See [debugging](#debugging).
 
-## OOM Score
-
-Netdata runs with `OOMScore = 1000`. This means Netdata will be the first to be killed when your server runs out of
-memory.
-
-You can set Netdata OOMScore in `netdata.conf`, like this:
-
-```conf
-[global]
-    OOM score = 1000
-```
-
-Netdata logs its OOM score when it starts:
-
-```sh
-# grep OOM /var/log/netdata/error.log
-2017-10-15 03:47:31: netdata INFO : Adjusted my Out-Of-Memory (OOM) score from 0 to 1000.
-```
-
-### OOM score and systemd
-
-Netdata will not be able to lower its OOM Score below zero, when it is started as the `netdata` user (systemd case).
-
-To allow Netdata control its OOM Score in such cases, you will need to edit `netdata.service` and set:
-
-```sh
-[Service]
-# The minimum Netdata Out-Of-Memory (OOM) score.
-# Netdata (via [global].OOM score in netdata.conf) can only increase the value set here.
-# To decrease it, set the minimum here and set the same or a higher value in netdata.conf.
-# Valid values: -1000 (never kill netdata) to 1000 (always kill netdata).
-OOMScoreAdjust=-1000
-```
-
-Run `systemctl daemon-reload` to reload these changes.
-
-The above, sets and OOMScore for Netdata to `-1000`, so that Netdata can increase it via `netdata.conf`.
-
-If you want to control it entirely via systemd, you can set in `netdata.conf`:
-
-```conf
-[global]
-    OOM score = keep
-```
-
-Using the above, whatever OOM Score you have set at `netdata.service` will be maintained by netdata.
-
 ## Netdata process scheduling policy
 
-By default Netdata runs with the `idle` process scheduling policy, so that it uses CPU resources, only when there is
-idle CPU to spare. On very busy servers (or weak servers), this can lead to gaps on the charts.
+By default Netdata versions prior to 1.34.0 run with the `idle` process scheduling policy, so that it uses CPU
+resources, only when there is idle CPU to spare. On very busy servers (or weak servers), this can lead to gaps on
+the charts.
+
+Starting with version 1.34.0, Netdata instead uses the `batch` scheduling policy by default. This largely eliminates
+issues with gaps in charts on busy systems while still keeping the impact on the rest of the system low.
 
 You can set Netdata scheduling policy in `netdata.conf`, like this:
 
@@ -315,9 +272,9 @@ You can set Netdata scheduling policy in `netdata.conf`, like this:
 
 You can use the following:
 
-| policy                    | description                                                                                                                                                                                                                                                                                                                                                                                                              |                              
+| policy                    | description                                                                                                                                                                                                                                                                                                                                                                                                              |
 | :-----------------------: | :----------                                                                                                                                                                                                                                                                                                                                                                                                              |
-| `idle`                    | use CPU only when there is spare - this is lower than nice 19 - it is the default for Netdata and it is so low that Netdata will run in "slow motion" under extreme system load, resulting in short (1-2 seconds) gaps at the charts.                                                                                                                                                                                    | 
+| `idle`                    | use CPU only when there is spare - this is lower than nice 19 - it is the default for Netdata and it is so low that Netdata will run in "slow motion" under extreme system load, resulting in short (1-2 seconds) gaps at the charts.                                                                                                                                                                                    |
 | `other`<br/>or<br/>`nice` | this is the default policy for all processes under Linux. It provides dynamic priorities based on the `nice` level of each process. Check below for setting this `nice` level for netdata.                                                                                                                                                                                                                               |
 | `batch`                   | This policy is similar to `other` in that it schedules the thread according to its dynamic priority (based on the `nice` value).  The difference is that this policy will cause the scheduler to always assume that the thread is CPU-intensive.  Consequently, the scheduler will  apply a small scheduling penalty with respect to wake-up behavior, so that this thread is mildly disfavored in scheduling decisions. |
 | `fifo`                    | `fifo` can be used only with static priorities higher than 0, which means that when a `fifo` threads becomes runnable, it will always  immediately  preempt  any  currently running  `other`, `batch`, or `idle` thread.  `fifo` is a simple scheduling algorithm without time slicing.                                                                                                                                  |
@@ -551,4 +508,4 @@ valgrind $(which netdata) -D
 Netdata will start and it will be a lot slower. Now reproduce the crash and `valgrind` will dump on your console the
 stack trace. Open a new github issue and post the output.
 
-[![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%2Fdaemon%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)
+
diff --git a/daemon/analytics.c b/daemon/analytics.c
index 4501a46a..0af41fdd 100644
--- a/daemon/analytics.c
+++ b/daemon/analytics.c
@@ -362,21 +362,15 @@ void analytics_alarms_notifications(void)
 
 void analytics_get_install_type(void)
 {
-    struct install_type_info t = get_install_type();
-
-    if (t.install_type == NULL) {
+    if (localhost->system_info->install_type == NULL) {
         analytics_set_data_str(&analytics_data.netdata_install_type, "unknown");
     } else {
-        analytics_set_data_str(&analytics_data.netdata_install_type, t.install_type);
+        analytics_set_data_str(&analytics_data.netdata_install_type, localhost->system_info->install_type);
     }
 
-    if (t.prebuilt_distro != NULL) {
-        analytics_set_data_str(&analytics_data.netdata_prebuilt_distro, t.prebuilt_distro);
+    if (localhost->system_info->prebuilt_dist != NULL) {
+        analytics_set_data_str(&analytics_data.netdata_prebuilt_distro, localhost->system_info->prebuilt_dist);
     }
-
-    freez(t.prebuilt_arch);
-    freez(t.prebuilt_distro);
-    freez(t.install_type);
 }
 
 /*
@@ -422,12 +416,16 @@ void analytics_metrics(void)
     rrdset_foreach_read(st, localhost)
     {
         rrdset_rdlock(st);
-        rrddim_foreach_read(rd, st)
-        {
-            if (rrddim_flag_check(rd, RRDDIM_FLAG_HIDDEN) || rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE))
-                continue;
-            dimensions++;
+
+        if (rrdset_is_available_for_viewers(st)) {
+            rrddim_foreach_read(rd, st)
+            {
+                if (rrddim_flag_check(rd, RRDDIM_FLAG_HIDDEN) || rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE))
+                    continue;
+                dimensions++;
+            }
         }
+
         rrdset_unlock(st);
     }
     {
diff --git a/daemon/anonymous-statistics.sh.in b/daemon/anonymous-statistics.sh.in
index 9167b706..9f8df188 100755
--- a/daemon/anonymous-statistics.sh.in
+++ b/daemon/anonymous-statistics.sh.in
@@ -18,7 +18,11 @@ ACTION_DATA=$(echo "${ACTION_DATA}" | tr '"' "'")
 # -------------------------------------------------------------------------------------------------
 # check opt-out
 
-if [ -f "@configdir_POST@/.opt-out-from-anonymous-statistics" ] || [ ! "${DO_NOT_TRACK:-0}" -eq 0 ] || [ -n "$DO_NOT_TRACK" ]; then
+if [ -f "@configdir_POST@/.opt-out-from-anonymous-statistics" ] ||
+  [ ! "${DISABLE_TELEMETRY:-0}" -eq 0 ] ||
+  [ -n "$DISABLE_TELEMETRY" ] ||
+  [ ! "${DO_NOT_TRACK:-0}" -eq 0 ] ||
+  [ -n "$DO_NOT_TRACK" ]; then
   exit 0
 fi
 
diff --git a/daemon/buildinfo.c b/daemon/buildinfo.c
index b64a78f2..86c586af 100644
--- a/daemon/buildinfo.c
+++ b/daemon/buildinfo.c
@@ -60,7 +60,6 @@
 // Optional libraries
 
 #ifdef HAVE_PROTOBUF
-#if defined(ACLK_NG) || defined(ENABLE_PROMETHEUS_REMOTE_WRITE)
 #define FEAT_PROTOBUF 1
 #ifdef BUNDLED_PROTOBUF
 #define FEAT_PROTOBUF_BUNDLED " (bundled)"
@@ -71,10 +70,6 @@
 #define FEAT_PROTOBUF 0
 #define FEAT_PROTOBUF_BUNDLED ""
 #endif
-#else
-#define FEAT_PROTOBUF 0
-#define FEAT_PROTOBUF_BUNDLED ""
-#endif
 
 #ifdef ENABLE_JSONC
 #define FEAT_JSONC 1
@@ -222,9 +217,8 @@ char *get_value_from_key(char *buffer, char *key) {
     return s;
 }
 
-struct install_type_info get_install_type() {
+void get_install_type(char **install_type, char **prebuilt_arch, char **prebuilt_dist) {
     char *install_type_filename;
-    struct install_type_info ret = {.install_type = NULL, .prebuilt_arch = NULL, .prebuilt_distro = NULL};
 
     int install_type_filename_len = (strlen(netdata_configured_user_config_dir) + strlen(".install-type") + 3);
     install_type_filename = mallocz(sizeof(char) * install_type_filename_len);
@@ -237,41 +231,42 @@ struct install_type_info get_install_type() {
 
         while ((s = fgets_trim_len(buf, 256, fp, &len))) {
             if (!strncmp(buf, "INSTALL_TYPE='", 14))
-                ret.install_type = strdupz((char *)get_value_from_key(buf, "INSTALL_TYPE"));
+                *install_type = strdupz((char *)get_value_from_key(buf, "INSTALL_TYPE"));
             else if (!strncmp(buf, "PREBUILT_ARCH='", 15))
-                ret.prebuilt_arch = strdupz((char *)get_value_from_key(buf, "PREBUILT_ARCH"));
+                *prebuilt_arch = strdupz((char *)get_value_from_key(buf, "PREBUILT_ARCH"));
             else if (!strncmp(buf, "PREBUILT_DISTRO='", 17))
-                ret.prebuilt_distro = strdupz((char *)get_value_from_key(buf, "PREBUILT_DISTRO"));
+                *prebuilt_dist = strdupz((char *)get_value_from_key(buf, "PREBUILT_DISTRO"));
         }
         fclose(fp);
     }
     freez(install_type_filename);
-
-    return ret;
 }
 
 void print_build_info(void) {
-    struct install_type_info t = get_install_type();
+    char *install_type = NULL;
+    char *prebuilt_arch = NULL;
+    char *prebuilt_distro = NULL;
+    get_install_type(&install_type, &prebuilt_arch, &prebuilt_distro);
 
     printf("Configure options: %s\n", CONFIGURE_COMMAND);
 
-    if (t.install_type == NULL) {
+    if (install_type == NULL) {
         printf("Install type: unknown\n");
     } else {
-        printf("Install type: %s\n", t.install_type);
+        printf("Install type: %s\n", install_type);
     }
 
-    if (t.prebuilt_arch != NULL) {
-        printf("    Binary architecture: %s\n", t.prebuilt_arch);
+    if (prebuilt_arch != NULL) {
+        printf("    Binary architecture: %s\n", prebuilt_arch);
     }
 
-    if (t.prebuilt_distro != NULL) {
-        printf("    Packaging distro: %s\n", t.prebuilt_distro);
+    if (prebuilt_distro != NULL) {
+        printf("    Packaging distro: %s\n", prebuilt_distro);
     }
 
-    freez(t.install_type);
-    freez(t.prebuilt_arch);
-    freez(t.prebuilt_distro);
+    freez(install_type);
+    freez(prebuilt_arch);
+    freez(prebuilt_distro);
 
     printf("Features:\n");
     printf("    dbengine:                   %s\n", FEAT_YES_NO(FEAT_DBENGINE));
@@ -372,41 +367,104 @@ void print_build_info_json(void) {
     printf("}\n");
 };
 
-//return a list of enabled features for use in analytics
-//find a way to have proper |
+#define add_to_bi(buffer, str)       \
+    { if(first) {                    \
+        buffer_strcat (b, str);      \
+        first = 0;                   \
+    } else                           \
+        buffer_strcat (b, "|" str); }
+
 void analytics_build_info(BUFFER *b) {
-    if(FEAT_DBENGINE)        buffer_strcat (b, "dbengine");
-    if(FEAT_NATIVE_HTTPS)    buffer_strcat (b, "|Native HTTPS");
-    if(FEAT_CLOUD)           buffer_strcat (b, "|Netdata Cloud");
-    if(FEAT_CLOUD)           buffer_strcat (b, "|ACLK Next Generation");
-    if(NEW_CLOUD_PROTO)      buffer_strcat (b, "|New Cloud Protocol Support");
-    if(FEAT_TLS_HOST_VERIFY) buffer_strcat (b, "|TLS Host Verification");
-    if(FEAT_ML)              buffer_strcat (b, "|Machine Learning");
-    if(FEAT_STREAM_COMPRESSION) buffer_strcat (b, "|Stream Compression");
-
-    if(FEAT_PROTOBUF)        buffer_strcat (b, "|protobuf");
-    if(FEAT_JEMALLOC)        buffer_strcat (b, "|jemalloc");
-    if(FEAT_JSONC)           buffer_strcat (b, "|JSON-C");
-    if(FEAT_LIBCAP)          buffer_strcat (b, "|libcap");
-    if(FEAT_CRYPTO)          buffer_strcat (b, "|libcrypto");
-    if(FEAT_LIBM)            buffer_strcat (b, "|libm");
-
-    if(FEAT_TCMALLOC)       buffer_strcat(b, "|tcalloc");
-    if(FEAT_ZLIB)           buffer_strcat(b, "|zlib");
-
-    if(FEAT_APPS_PLUGIN)    buffer_strcat(b, "|apps");
-    if(FEAT_CGROUP_NET)     buffer_strcat(b, "|cgroup Network Tracking");
-    if(FEAT_CUPS)           buffer_strcat(b, "|CUPS");
-    if(FEAT_EBPF)           buffer_strcat(b, "|EBPF");
-    if(FEAT_IPMI)           buffer_strcat(b, "|IPMI");
-    if(FEAT_NFACCT)         buffer_strcat(b, "|NFACCT");
-    if(FEAT_PERF)           buffer_strcat(b, "|perf");
-    if(FEAT_SLABINFO)       buffer_strcat(b, "|slabinfo");
-    if(FEAT_XEN)            buffer_strcat(b, "|Xen");
-    if(FEAT_XEN_VBD_ERROR)  buffer_strcat(b, "|Xen VBD Error Tracking");
-
-    if(FEAT_KINESIS)        buffer_strcat(b, "|AWS Kinesis");
-    if(FEAT_PUBSUB)         buffer_strcat(b, "|GCP PubSub");
-    if(FEAT_MONGO)          buffer_strcat(b, "|MongoDB");
-    if(FEAT_REMOTE_WRITE)   buffer_strcat(b, "|Prometheus Remote Write");
+    int first = 1;
+#ifdef ENABLE_DBENGINE
+    add_to_bi(b, "dbengine");
+#endif
+#ifdef ENABLE_HTTPS
+    add_to_bi(b, "Native HTTPS");
+#endif
+#ifdef ENABLE_ACLK
+    add_to_bi(b, "Netdata Cloud|ACLK Next Generation");
+#endif
+#ifdef ENABLE_NEW_CLOUD_PROTOCOL
+    add_to_bi(b, "New Cloud Protocol Support");
+#endif
+#if (FEAT_TLS_HOST_VERIFY!=0)
+    add_to_bi(b, "TLS Host Verification");
+#endif
+#ifdef ENABLE_ML
+    add_to_bi(b, "Machine Learning");
+#endif
+#ifdef ENABLE_COMPRESSION
+    add_to_bi(b, "Stream Compression");
+#endif
+
+#ifdef HAVE_PROTOBUF
+    add_to_bi(b, "protobuf");
+#endif
+#ifdef ENABLE_JEMALLOC
+    add_to_bi(b, "jemalloc");
+#endif
+#ifdef ENABLE_JSONC
+    add_to_bi(b, "JSON-C");
+#endif
+#ifdef HAVE_CAPABILITY
+    add_to_bi(b, "libcap");
+#endif
+#ifdef HAVE_CRYPTO
+    add_to_bi(b, "libcrypto");
+#endif
+#ifdef STORAGE_WITH_MATH
+    add_to_bi(b, "libm");
+#endif
+
+#ifdef ENABLE_TCMALLOC
+    add_to_bi(b, "tcalloc");
+#endif
+#ifdef NETDATA_WITH_ZLIB
+    add_to_bi(b, "zlib");
+#endif
+
+#ifdef ENABLE_APPS_PLUGIN
+    add_to_bi(b, "apps");
+#endif
+#ifdef HAVE_SETNS
+    add_to_bi(b, "cgroup Network Tracking");
+#endif
+#ifdef HAVE_CUPS
+    add_to_bi(b, "CUPS");
+#endif
+#ifdef HAVE_LIBBPF
+    add_to_bi(b, "EBPF");
+#endif
+#ifdef HAVE_FREEIPMI
+    add_to_bi(b, "IPMI");
+#endif
+#ifdef HAVE_NFACCT
+    add_to_bi(b, "NFACCT");
+#endif
+#ifdef ENABLE_PERF_PLUGIN
+    add_to_bi(b, "perf");
+#endif
+#ifdef ENABLE_SLABINFO
+    add_to_bi(b, "slabinfo");
+#endif
+#ifdef HAVE_LIBXENSTAT
+    add_to_bi(b, "Xen");
+#endif
+#ifdef HAVE_XENSTAT_VBD_ERROR
+    add_to_bi(b, "Xen VBD Error Tracking");
+#endif
+
+#ifdef HAVE_KINESIS
+    add_to_bi(b, "AWS Kinesis");
+#endif
+#ifdef ENABLE_EXPORTING_PUBSUB
+    add_to_bi(b, "GCP PubSub");
+#endif
+#ifdef HAVE_MONGOC
+    add_to_bi(b, "MongoDB");
+#endif
+#ifdef ENABLE_PROMETHEUS_REMOTE_WRITE
+    add_to_bi(b, "Prometheus Remote Write");
+#endif
 }
diff --git a/daemon/buildinfo.h b/daemon/buildinfo.h
index e2a31c94..542a0e92 100644
--- a/daemon/buildinfo.h
+++ b/daemon/buildinfo.h
@@ -3,18 +3,12 @@
 #ifndef NETDATA_BUILDINFO_H
 #define NETDATA_BUILDINFO_H 1
 
-struct install_type_info {
-    char *install_type;
-    char *prebuilt_arch;
-    char *prebuilt_distro;
-};
-
 extern void print_build_info(void);
 
 extern void print_build_info_json(void);
 
 extern char *get_value_from_key(char *buffer, char *key);
 
-extern struct install_type_info get_install_type();
+extern void get_install_type(char **install_type, char **prebuilt_arch, char **prebuilt_dist);
 
 #endif // NETDATA_BUILDINFO_H
diff --git a/daemon/commands.c b/daemon/commands.c
index ddf20fe0..6efc37c9 100644
--- a/daemon/commands.c
+++ b/daemon/commands.c
@@ -387,6 +387,7 @@ static void pipe_write_cb(uv_write_t* req, int status)
 
     uv_close((uv_handle_t *)client, pipe_close_cb);
     --clients;
+    freez(client->data);
     info("Command Clients = %u\n", clients);
 }
 
@@ -400,6 +401,10 @@ static inline void add_string_to_command_reply(char *reply_string, unsigned *rep
     unsigned len;
 
     len = strlen(str);
+
+    if (MAX_COMMAND_LENGTH - 1 < len + *reply_string_size)
+        len = MAX_COMMAND_LENGTH - *reply_string_size - 1;
+
     strncpyz(reply_string + *reply_string_size, str, len);
     *reply_string_size += len;
 }
@@ -407,7 +412,7 @@ static inline void add_string_to_command_reply(char *reply_string, unsigned *rep
 static void send_command_reply(struct command_context *cmd_ctx, cmd_status_t status, char *message)
 {
     int ret;
-    char reply_string[MAX_COMMAND_LENGTH] = {'\0', };
+    char *reply_string = mallocz(MAX_COMMAND_LENGTH);
     char exit_status_string[MAX_EXIT_STATUS_LENGTH + 1] = {'\0', };
     unsigned reply_string_size = 0;
     uv_buf_t write_buf;
@@ -424,6 +429,7 @@ static void send_command_reply(struct command_context *cmd_ctx, cmd_status_t sta
     }
 
     cmd_ctx->write_req.data = client;
+    client->data = reply_string;
     write_buf.base = reply_string;
     write_buf.len = reply_string_size;
     ret = uv_write(&cmd_ctx->write_req, (uv_stream_t *)client, &write_buf, 1, pipe_write_cb);
diff --git a/daemon/common.h b/daemon/common.h
index 5354e2ae..e11a6d6b 100644
--- a/daemon/common.h
+++ b/daemon/common.h
@@ -51,9 +51,7 @@
 // the registry is actually an API feature
 #include "registry/registry.h"
 
-// backends for archiving the metrics
-#include "backends/backends.h"
-// the new exporting engine for archiving the metrics
+// exporting engine for archiving the metrics
 #include "exporting/exporting_engine.h"
 
 // the netdata API
diff --git a/daemon/config/README.md b/daemon/config/README.md
index cc755af7..c3c63992 100644
--- a/daemon/config/README.md
+++ b/daemon/config/README.md
@@ -19,10 +19,9 @@ This config file **is not needed by default**. Netdata works fine out of the box
     settings.
 4.  `[health]` to [configure](#health-section-options) general settings for [health monitoring](/health/README.md)
 5.  `[registry]` for the [Netdata registry](/registry/README.md).
-6.  `[backend]` to set up [streaming and replication](/streaming/README.md) options.
-7.  `[statsd]` for the general settings of the [stats.d.plugin](/collectors/statsd.plugin/README.md).
-8.  `[plugin:NAME]` sections for each collector plugin, under the comment [Per plugin configuration](#per-plugin-configuration).
-9.  `[CHART_NAME]` sections for each chart defined, under the comment [Per chart configuration](#per-chart-configuration).
+6.  `[statsd]` for the general settings of the [stats.d.plugin](/collectors/statsd.plugin/README.md).
+7.  `[plugin:NAME]` sections for each collector plugin, under the comment [Per plugin configuration](#per-plugin-configuration).
+8.  `[CHART_NAME]` sections for each chart defined, under the comment [Per chart configuration](#per-chart-configuration).
 
 The configuration file is a `name = value` dictionary. Netdata will not complain if you set options unknown to it. When you check the running configuration by accessing the URL `/netdata.conf` on your Netdata server, Netdata will add a comment on settings it does not currently use.
 
@@ -47,45 +46,45 @@ Please note that your data history will be lost if you have modified `history` p
 
 ### [global] section options
 
-| setting|default|info|||
-|:-----:|:-----:|:---|---|---|
-| process scheduling policy|`keep`|See [Netdata process scheduling policy](/daemon/README.md#netdata-process-scheduling-policy)|||
-| OOM score|`1000`|See [OOM score](/daemon/README.md#oom-score)|||
-| glibc malloc arena max for plugins|`1`|See [Virtual memory](/daemon/README.md#virtual-memory).|||
-| glibc malloc arena max for Netdata|`1`|See [Virtual memory](/daemon/README.md#virtual-memory).|||
-| hostname|auto-detected|The hostname of the computer running Netdata.|||
-| history|`3996`| Used with `memory mode = save/map/ram/alloc`, not the default `memory mode = dbengine`. This number reflects the number of entries the `netdata` daemon will by default keep in memory for each chart dimension. This setting can also be configured per chart. Check [Memory Requirements](/database/README.md) for more information. |||
-| update every|`1`|The frequency in seconds, for data collection. For more information see the [performance guide](/docs/guides/configure/performance.md).|||
-| config directory|`/etc/netdata`|The directory configuration files are kept.|||
-| stock config directory|`/usr/lib/netdata/conf.d`||||
-| log directory|`/var/log/netdata`|The directory in which the [log files](/daemon/README.md#log-files) are kept.|||
-| web files directory|`/usr/share/netdata/web`|The directory the web static files are kept.|||
-| cache directory|`/var/cache/netdata`|The directory the memory database will be stored if and when Netdata exits. Netdata will re-read the database when it will start again, to continue from the same point.|||
-| lib directory|`/var/lib/netdata`|Contains the alarm log and the Netdata instance guid.|||
-| home directory|`/var/cache/netdata`|Contains the db files for the collected metrics|||
-| plugins directory|`"/usr/libexec/netdata/plugins.d" "/etc/netdata/custom-plugins.d"`|The directory plugin programs are kept. This setting supports multiple directories, space separated. If any directory path contains spaces, enclose it in single or double quotes.|||
+| setting|default|info|
+|:-----:|:-----:|:---|
+| process scheduling policy|`keep`|See [Netdata process scheduling policy](/daemon/README.md#netdata-process-scheduling-policy)|
+| OOM score|`0`||
+| glibc malloc arena max for plugins|`1`|See [Virtual memory](/daemon/README.md#virtual-memory).|
+| glibc malloc arena max for Netdata|`1`|See [Virtual memory](/daemon/README.md#virtual-memory).|
+| hostname|auto-detected|The hostname of the computer running Netdata.|
+| history|`3996`| Used with `memory mode = save/map/ram/alloc`, not the default `memory mode = dbengine`. This number reflects the number of entries the `netdata` daemon will by default keep in memory for each chart dimension. This setting can also be configured per chart. Check [Memory Requirements](/database/README.md) for more information. |
+| update every|`1`|The frequency in seconds, for data collection. For more information see the [performance guide](/docs/guides/configure/performance.md).|
+| config directory|`/etc/netdata`|The directory configuration files are kept.|
+| stock config directory|`/usr/lib/netdata/conf.d`||
+| log directory|`/var/log/netdata`|The directory in which the [log files](/daemon/README.md#log-files) are kept.|
+| web files directory|`/usr/share/netdata/web`|The directory the web static files are kept.|
+| cache directory|`/var/cache/netdata`|The directory the memory database will be stored if and when Netdata exits. Netdata will re-read the database when it will start again, to continue from the same point.|
+| lib directory|`/var/lib/netdata`|Contains the alarm log and the Netdata instance guid.|
+| home directory|`/var/cache/netdata`|Contains the db files for the collected metrics|
+| plugins directory|`"/usr/libexec/netdata/plugins.d" "/etc/netdata/custom-plugins.d"`|The directory plugin programs are kept. This setting supports multiple directories, space separated. If any directory path contains spaces, enclose it in single or double quotes.|
 | memory mode         | `dbengine` | `dbengine`: The default for long-term metrics storage with efficient RAM and disk usage. Can be extended with `page cache size` and `dbengine disk space`. <br />`save`: Netdata will save its round robin database on exit and load it on startup. <br />`map`: Cache files will be updated in real-time. Not ideal for systems with high load or slow disks (check `man mmap`). <br />`ram`: The round-robin database will be temporary and it will be lost when Netdata exits. <br />`none`: Disables the database at this host, and disables health monitoring entirely, as that requires a database of metrics. |
-| page cache size     | 32         | Determines the amount of RAM in MiB that is dedicated to caching Netdata metric values. |||
-| dbengine disk space | 256        | Determines the amount of disk space in MiB that is dedicated to storing Netdata metric values and all related metadata describing them. |||
-| dbengine multihost disk space | 256        | Same functionality as `dbengine disk space`, but includes support for storing metrics streamed to a parent node by its children. Can be used in single-node environments as well. |||
-| host access prefix||This is used in docker environments where /proc, /sys, etc have to be accessed via another path. You may also have to set SYS_PTRACE capability on the docker for this work. Check [issue 43](https://github.com/netdata/netdata/issues/43).|
-| memory deduplication (ksm)|`yes`|When set to `yes`, Netdata will offer its in-memory round robin database to kernel same page merging (KSM) for deduplication. For more information check [Memory Deduplication - Kernel Same Page Merging - KSM](/database/README.md#ksm)|||
-| TZ environment variable|`:/etc/localtime`|Where to find the timezone|||
-| timezone|auto-detected|The timezone retrieved from the environment variable|||
-| debug flags|`0x0000000000000000`|Bitmap of debug options to enable. For more information check [Tracing Options](/daemon/README.md#debugging).|||
-| debug log|`/var/log/netdata/debug.log`|The filename to save debug information. This file will not be created if debugging is not enabled. You can also set it to `syslog` to send the debug messages to syslog, or `none` to disable this log. For more information check [Tracing Options](/daemon/README.md#debugging).|||
-| error log|`/var/log/netdata/error.log`|The filename to save error messages for Netdata daemon and all plugins (`stderr` is sent here for all Netdata programs, including the plugins). You can also set it to `syslog` to send the errors to syslog, or `none` to disable this log.|||
-| access log|`/var/log/netdata/access.log`|The filename to save the log of web clients accessing Netdata charts. You can also set it to `syslog` to send the access log to syslog, or `none` to disable this log.|||
-| errors flood protection period|`1200`|Length of period (in sec) during which the number of errors should not exceed the `errors to trigger flood protection`.|||
-| errors to trigger flood protection|`200`|Number of errors written to the log in `errors flood protection period` sec before flood protection is activated.|||
-| run as user|`netdata`|The user Netdata will run as.|||
-| pthread stack size|auto-detected||||
-| cleanup obsolete charts after seconds|`3600`|See [monitoring ephemeral containers](/collectors/cgroups.plugin/README.md#monitoring-ephemeral-containers), also sets the timeout for cleaning up obsolete dimensions|||
-| gap when lost iterations above|`1`||||
-| cleanup orphan hosts after seconds|`3600`|How long to wait until automatically removing from the DB a remote Netdata host (child) that is no longer sending data.|||
-| delete obsolete charts files|`yes`|See [monitoring ephemeral containers](/collectors/cgroups.plugin/README.md#monitoring-ephemeral-containers), also affects the deletion of files for obsolete dimensions|||
-| delete orphan hosts files|`yes`|Set to `no` to disable non-responsive host removal.|||
-| enable zero metrics|`no`|Set to `yes` to show charts when all their metrics are zero.|||
+| page cache size     | 32         | Determines the amount of RAM in MiB that is dedicated to caching Netdata metric values. |
+| dbengine disk space | 256        | Determines the amount of disk space in MiB that is dedicated to storing Netdata metric values and all related metadata describing them. |
+| dbengine multihost disk space | 256        | Same functionality as `dbengine disk space`, but includes support for storing metrics streamed to a parent node by its children. Can be used in single-node environments as well. |
+| host access prefix| |This is used in docker environments where /proc, /sys, etc have to be accessed via another path. You may also have to set SYS_PTRACE capability on the docker for this work. Check [issue 43](https://github.com/netdata/netdata/issues/43).|
+| memory deduplication (ksm)|`yes`|When set to `yes`, Netdata will offer its in-memory round robin database to kernel same page merging (KSM) for deduplication. For more information check [Memory Deduplication - Kernel Same Page Merging - KSM](/database/README.md#ksm)|
+| TZ environment variable|`:/etc/localtime`|Where to find the timezone|
+| timezone|auto-detected|The timezone retrieved from the environment variable|
+| debug flags|`0x0000000000000000`|Bitmap of debug options to enable. For more information check [Tracing Options](/daemon/README.md#debugging).|
+| debug log|`/var/log/netdata/debug.log`|The filename to save debug information. This file will not be created if debugging is not enabled. You can also set it to `syslog` to send the debug messages to syslog, or `none` to disable this log. For more information check [Tracing Options](/daemon/README.md#debugging).|
+| error log|`/var/log/netdata/error.log`|The filename to save error messages for Netdata daemon and all plugins (`stderr` is sent here for all Netdata programs, including the plugins). You can also set it to `syslog` to send the errors to syslog, or `none` to disable this log.|
+| access log|`/var/log/netdata/access.log`|The filename to save the log of web clients accessing Netdata charts. You can also set it to `syslog` to send the access log to syslog, or `none` to disable this log.|
+| errors flood protection period|`1200`|Length of period (in sec) during which the number of errors should not exceed the `errors to trigger flood protection`.|
+| errors to trigger flood protection|`200`|Number of errors written to the log in `errors flood protection period` sec before flood protection is activated.|
+| run as user|`netdata`|The user Netdata will run as.|
+| pthread stack size|auto-detected||
+| cleanup obsolete charts after seconds|`3600`|See [monitoring ephemeral containers](/collectors/cgroups.plugin/README.md#monitoring-ephemeral-containers), also sets the timeout for cleaning up obsolete dimensions|
+| gap when lost iterations above|`1`||
+| cleanup orphan hosts after seconds|`3600`|How long to wait until automatically removing from the DB a remote Netdata host (child) that is no longer sending data.|
+| delete obsolete charts files|`yes`|See [monitoring ephemeral containers](/collectors/cgroups.plugin/README.md#monitoring-ephemeral-containers), also affects the deletion of files for obsolete dimensions|
+| delete orphan hosts files|`yes`|Set to `no` to disable non-responsive host removal.|
+| enable zero metrics|`no`|Set to `yes` to show charts when all their metrics are zero.|
 
 ### [web] section options
 
@@ -129,10 +128,6 @@ monitoring](/health/README.md).
 
 To understand what this section is and how it should be configured, please refer to the [registry documentation](/registry/README.md).
 
-### [backend]
-
-Refer to the [streaming and replication](/streaming/README.md) documentation.
-
 ## Per-plugin configuration
 
 The configuration options for plugins appear in sections following the pattern `[plugin:NAME]`.
@@ -227,4 +222,4 @@ multiplying the value of `out` by -1, Netdata creates the negative values seen i
 ![The system.io chart on a macOS
 laptop](https://user-images.githubusercontent.com/1153921/69286708-2cfb3900-0bb1-11ea-9fcd-dd8fbb2adf11.png)
 
-[![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%2Fdaemon%2Fconfig%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)
+
diff --git a/daemon/daemon.c b/daemon/daemon.c
index 68e161a3..2b8a6552 100644
--- a/daemon/daemon.c
+++ b/daemon/daemon.c
@@ -102,7 +102,11 @@ int become_user(const char *username, int pid_fd) {
     gid_t *supplementary_groups = NULL;
     if(ngroups > 0) {
         supplementary_groups = mallocz(sizeof(gid_t) * ngroups);
+#ifdef __APPLE__
+        if(getgrouplist(username, gid, (int *)supplementary_groups, &ngroups) == -1) {
+#else
         if(getgrouplist(username, gid, supplementary_groups, &ngroups) == -1) {
+#endif /* __APPLE__ */
             if(am_i_root)
                 error("Cannot get supplementary groups of user '%s'.", username);
 
@@ -173,7 +177,7 @@ int become_user(const char *username, int pid_fd) {
 
 static void oom_score_adj(void) {
     char buf[30 + 1];
-    long long int old_score, wanted_score = OOM_SCORE_ADJ_MAX, final_score = 0;
+    long long int old_score, wanted_score = 0, final_score = 0;
 
     // read the existing score
     if(read_single_signed_number_file("/proc/self/oom_score_adj", &old_score)) {
@@ -271,8 +275,8 @@ struct sched_def {
         // the available members are important too!
         // these are all the possible scheduling policies supported by netdata
 
-#ifdef SCHED_IDLE
-        { "idle", SCHED_IDLE, 0, SCHED_FLAG_NONE },
+#ifdef SCHED_BATCH
+        { "batch", SCHED_BATCH, 0, SCHED_FLAG_USE_NICE },
 #endif
 
 #ifdef SCHED_OTHER
@@ -280,6 +284,10 @@ struct sched_def {
         { "nice",  SCHED_OTHER, 0, SCHED_FLAG_USE_NICE },
 #endif
 
+#ifdef SCHED_IDLE
+        { "idle", SCHED_IDLE, 0, SCHED_FLAG_NONE },
+#endif
+
 #ifdef SCHED_RR
         { "rr", SCHED_RR, 0, SCHED_FLAG_PRIORITY_CONFIGURABLE },
 #endif
@@ -288,10 +296,6 @@ struct sched_def {
         { "fifo", SCHED_FIFO, 0, SCHED_FLAG_PRIORITY_CONFIGURABLE },
 #endif
 
-#ifdef SCHED_BATCH
-        { "batch", SCHED_BATCH, 0, SCHED_FLAG_USE_NICE },
-#endif
-
         // do not change the scheduling priority
         { "keep", 0, 0, SCHED_FLAG_KEEP_AS_IS },
         { "none", 0, 0, SCHED_FLAG_KEEP_AS_IS },
@@ -339,13 +343,7 @@ static void sched_getscheduler_report(void) {
         }
     }
 }
-#else // !HAVE_SCHED_GETSCHEDULER
-static void sched_getscheduler_report(void) {
-#ifdef HAVE_GETPRIORITY
-    info("Running with priority %d", getpriority(PRIO_PROCESS, 0));
-#endif // HAVE_GETPRIORITY
-}
-#endif // !HAVE_SCHED_GETSCHEDULER
+#endif /* HAVE_SCHED_GETSCHEDULER */
 
 #ifdef HAVE_SCHED_SETSCHEDULER
 
@@ -418,11 +416,11 @@ fallback:
 report:
     sched_getscheduler_report();
 }
-#else // !HAVE_SCHED_SETSCHEDULER
+#else /* HAVE_SCHED_SETSCHEDULER */
 static void sched_setscheduler_set(void) {
     process_nice_level();
 }
-#endif // !HAVE_SCHED_SETSCHEDULER
+#endif /* HAVE_SCHED_SETSCHEDULER */
 
 int become_daemon(int dont_fork, const char *user)
 {
diff --git a/daemon/get-kubernetes-labels.sh.in b/daemon/get-kubernetes-labels.sh.in
index 5aa89ab9..7e11ba3d 100644
--- a/daemon/get-kubernetes-labels.sh.in
+++ b/daemon/get-kubernetes-labels.sh.in
@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 
-# Checks if netdata is running in a kubernetes pod and fetches that pod's labels
+# Checks if netdata is running in a kubernetes pod and fetches:
+#   - pod's labels
+#   - kubernetes cluster name (GKE only)
 
 if [ -z "${KUBERNETES_SERVICE_HOST}" ] || [ -z "${KUBERNETES_PORT_443_TCP_PORT}" ] || [ -z "${MY_POD_NAMESPACE}" ] || [ -z "${MY_POD_NAME}" ]; then
   exit 0
@@ -37,5 +39,20 @@ if ! KUBE_SYSTEM_NS_UID=$(jq -r '.metadata.uid' <<< "$KUBE_SYSTEM_NS_DATA" 2>&1)
   exit 1
 fi
 
-echo -e "$POD_LABELS\nk8s_cluster_id:$KUBE_SYSTEM_NS_UID"
+LABELS="$POD_LABELS\nk8s_cluster_id:$KUBE_SYSTEM_NS_UID"
+
+GCP_META_HEADER="Metadata-Flavor: Google"
+GCP_META_URL="http://metadata/computeMetadata/v1"
+GKE_CLUSTER_NAME=""
+
+if id=$(curl --fail -s -m 5 --noproxy "*" -H "$GCP_META_HEADER" "$GCP_META_URL/project/project-id"); then
+  loc=$(curl --fail -s -m 5 --noproxy "*" -H "$GCP_META_HEADER" "$GCP_META_URL/instance/attributes/cluster-location")
+  name=$(curl --fail -s -m 5 --noproxy "*" -H "$GCP_META_HEADER" "$GCP_META_URL/instance/attributes/cluster-name")
+  [ -n "$id" ] && [ -n "$loc" ] && [ -n "$name" ] && GKE_CLUSTER_NAME="gke_${id}_${loc}_${name}"
+fi
+
+[ -n "$GKE_CLUSTER_NAME" ] && LABELS+="\nk8s_cluster_name:$GKE_CLUSTER_NAME"
+
+echo -e "$LABELS"
+
 exit 0
diff --git a/daemon/global_statistics.c b/daemon/global_statistics.c
index f4f3e576..d5cc0315 100644
--- a/daemon/global_statistics.c
+++ b/daemon/global_statistics.c
@@ -37,7 +37,7 @@ static struct global_statistics {
         .rrdr_result_points_generated = 0,
 };
 
-#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+#if defined(HAVE_C___ATOMIC)
 #else
 netdata_mutex_t global_statistics_mutex = NETDATA_MUTEX_INITIALIZER;
 
@@ -52,7 +52,7 @@ static inline void global_statistics_unlock(void) {
 
 
 void rrdr_query_completed(uint64_t db_points_read, uint64_t result_points_generated) {
-#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+#if defined(HAVE_C___ATOMIC)
     __atomic_fetch_add(&global_statistics.rrdr_queries_made, 1, __ATOMIC_SEQ_CST);
     __atomic_fetch_add(&global_statistics.rrdr_db_points_read, db_points_read, __ATOMIC_SEQ_CST);
     __atomic_fetch_add(&global_statistics.rrdr_result_points_generated, result_points_generated, __ATOMIC_SEQ_CST);
@@ -75,7 +75,7 @@ void finished_web_request_statistics(uint64_t dt,
                                      uint64_t bytes_sent,
                                      uint64_t content_size,
                                      uint64_t compressed_content_size) {
-#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+#if defined(HAVE_C___ATOMIC)
     uint64_t old_web_usec_max = global_statistics.web_usec_max;
     while(dt > old_web_usec_max)
         __atomic_compare_exchange(&global_statistics.web_usec_max, &old_web_usec_max, &dt, 1, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
@@ -107,7 +107,7 @@ void finished_web_request_statistics(uint64_t dt,
 }
 
 uint64_t web_client_connected(void) {
-#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+#if defined(HAVE_C___ATOMIC)
     __atomic_fetch_add(&global_statistics.connected_clients, 1, __ATOMIC_SEQ_CST);
     uint64_t id = __atomic_fetch_add(&global_statistics.web_client_count, 1, __ATOMIC_SEQ_CST);
 #else
@@ -125,7 +125,7 @@ uint64_t web_client_connected(void) {
 }
 
 void web_client_disconnected(void) {
-#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+#if defined(HAVE_C___ATOMIC)
     __atomic_fetch_sub(&global_statistics.connected_clients, 1, __ATOMIC_SEQ_CST);
 #else
     if (web_server_is_multithreaded)
@@ -140,7 +140,7 @@ void web_client_disconnected(void) {
 
 
 static inline void global_statistics_copy(struct global_statistics *gs, uint8_t options) {
-#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+#if defined(HAVE_C___ATOMIC)
     gs->connected_clients            = __atomic_fetch_add(&global_statistics.connected_clients, 0, __ATOMIC_SEQ_CST);
     gs->web_requests                 = __atomic_fetch_add(&global_statistics.web_requests, 0, __ATOMIC_SEQ_CST);
     gs->web_usec                     = __atomic_fetch_add(&global_statistics.web_usec, 0, __ATOMIC_SEQ_CST);
diff --git a/daemon/main.c b/daemon/main.c
index 7c8e09a5..c1877897 100644
--- a/daemon/main.c
+++ b/daemon/main.c
@@ -250,6 +250,8 @@ void cancel_main_threads() {
     else
         info("All threads finished.");
 
+    for (i = 0; static_threads[i].name != NULL ; i++)
+        freez(static_threads[i].thread);
     free(static_threads);
 }
 
@@ -445,15 +447,6 @@ static void backwards_compatible_config() {
 
     config_move(CONFIG_SECTION_GLOBAL, "web compression level",
                 CONFIG_SECTION_WEB,    "gzip compression level");
-
-    config_move(CONFIG_SECTION_GLOBAL, "web files owner",
-                CONFIG_SECTION_WEB,    "web files owner");
-
-    config_move(CONFIG_SECTION_GLOBAL, "web files group",
-                CONFIG_SECTION_WEB,    "web files group");
-
-    config_move(CONFIG_SECTION_BACKEND, "opentsdb host tags",
-                CONFIG_SECTION_BACKEND, "host tags");
 }
 
 static void get_netdata_configured_variables() {
@@ -690,6 +683,7 @@ int main(int argc, char **argv) {
     int i;
     int config_loaded = 0;
     int dont_fork = 0;
+    bool close_open_fds = true;
     size_t default_stacksize;
     char *user = NULL;
 
@@ -794,8 +788,13 @@ int main(int argc, char **argv) {
                         }
 
                         if(strcmp(optarg, "unittest") == 0) {
-                            if(unit_test_buffer()) return 1;
-                            if(unit_test_str2ld()) return 1;
+                            if (unit_test_static_threads())
+                                return 1;
+                            if (unit_test_buffer())
+                                return 1;
+                            if (unit_test_str2ld())
+                                return 1;
+
                             // No call to load the config file on this code-path
                             post_conf_load(&user);
                             get_netdata_configured_variables();
@@ -1038,7 +1037,13 @@ int main(int argc, char **argv) {
                             print_build_info_json();
                             return 0;
                         }
-                        else {
+                        else if(strcmp(optarg, "keepopenfds") == 0) {
+                            // Internal dev option to skip closing inherited
+                            // open FDs. Useful, when we want to run the agent
+                            // under profiling tools that open/maintain their
+                            // own FDs.
+                            close_open_fds = false;
+                        } else {
                             fprintf(stderr, "Unknown -W parameter '%s'\n", optarg);
                             return help(1);
                         }
@@ -1053,12 +1058,12 @@ int main(int argc, char **argv) {
     }
 
 #ifdef _SC_OPEN_MAX
-    // close all open file descriptors, except the standard ones
-    // the caller may have left open files (lxc-attach has this issue)
-    {
-        int fd;
-        for(fd = (int) (sysconf(_SC_OPEN_MAX) - 1); fd > 2; fd--)
-            if(fd_is_valid(fd)) close(fd);
+    if (close_open_fds == true) {
+        // close all open file descriptors, except the standard ones
+        // the caller may have left open files (lxc-attach has this issue)
+        for(int fd = (int) (sysconf(_SC_OPEN_MAX) - 1); fd > 2; fd--)
+            if(fd_is_valid(fd))
+                close(fd);
     }
 #endif
 
@@ -1205,11 +1210,6 @@ int main(int argc, char **argv) {
 
     info("netdata started on pid %d.", getpid());
 
-    // IMPORTANT: these have to run once, while single threaded
-    // but after we have switched user
-    web_files_uid();
-    web_files_gid();
-
     netdata_threads_init_after_fork((size_t)config_get_number(CONFIG_SECTION_GLOBAL, "pthread stack size", (long)default_stacksize));
 
     // initialize internal registry
@@ -1232,6 +1232,7 @@ int main(int argc, char **argv) {
     struct rrdhost_system_info *system_info = calloc(1, sizeof(struct rrdhost_system_info));
     get_system_info(system_info);
     system_info->hops = 0;
+    get_install_type(&system_info->install_type, &system_info->prebuilt_arch, &system_info->prebuilt_dist);
 
     if(rrd_init(netdata_configured_hostname, system_info))
         fatal("Cannot initialize localhost instance with name '%s'.", netdata_configured_hostname);
@@ -1317,12 +1318,6 @@ int main(int argc, char **argv) {
     snprintfz(filename, FILENAME_MAX, "%s/.aclk_report_sent", netdata_configured_varlib_dir);
     if (netdata_anonymous_statistics_enabled > 0 && access(filename, F_OK)) { // -1 -> not initialized
         send_statistics("ACLK_DISABLED", "-", "-");
-#ifdef ACLK_NO_LWS
-        send_statistics("BUILD_FAIL_LWS", "-", "-");
-#endif
-#ifdef ACLK_NO_LIBMOSQ
-        send_statistics("BUILD_FAIL_MOSQ", "-", "-");
-#endif
         int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 444);
         if (fd == -1)
             error("Cannot create file '%s'. Please fix this.", filename);
diff --git a/daemon/service.c b/daemon/service.c
index d3a4e550..61cc1281 100644
--- a/daemon/service.c
+++ b/daemon/service.c
@@ -31,6 +31,11 @@ void *service_main(void *ptr)
         heartbeat_next(&hb, step);
 
         rrd_cleanup_obsolete_charts();
+
+        rrd_wrlock();
+        rrdhost_cleanup_orphan_hosts_nolock(localhost);
+        rrd_unlock();
+
     }
 
     netdata_thread_cleanup_pop(1);
diff --git a/daemon/static_threads.c b/daemon/static_threads.c
index 534b3c3d..c07473bd 100644
--- a/daemon/static_threads.c
+++ b/daemon/static_threads.c
@@ -11,9 +11,19 @@ extern void *health_main(void *ptr);
 extern void *pluginsd_main(void *ptr);
 extern void *service_main(void *ptr);
 extern void *statsd_main(void *ptr);
+extern void *timex_main(void *ptr);
 
 const struct netdata_static_thread static_threads_common[] = {
     {
+        .name = "PLUGIN[timex]",
+        .config_section = CONFIG_SECTION_PLUGINS,
+        .config_name = "timex",
+        .enabled = 1,
+        .thread = NULL,
+        .init_routine = NULL,
+        .start_routine = timex_main
+    },
+    {
         .name = "PLUGIN[check]",
         .config_section = CONFIG_SECTION_PLUGINS,
         .config_name = "checks",
@@ -86,15 +96,6 @@ const struct netdata_static_thread static_threads_common[] = {
         .start_routine = statsd_main
     },
     {
-        .name = "BACKENDS",
-        .config_section = NULL,
-        .config_name = NULL,
-        .enabled = 1,
-        .thread = NULL,
-        .init_routine = NULL,
-        .start_routine = backends_main
-    },
-    {
         .name = "EXPORTING",
         .config_section = NULL,
         .config_name = NULL,
diff --git a/daemon/static_threads_linux.c b/daemon/static_threads_linux.c
index e55c0fec..5f7a6776 100644
--- a/daemon/static_threads_linux.c
+++ b/daemon/static_threads_linux.c
@@ -10,15 +10,6 @@ extern void *timex_main(void *ptr);
 
 const struct netdata_static_thread static_threads_linux[] = {
     {
-        .name = "PLUGIN[timex]",
-        .config_section = CONFIG_SECTION_PLUGINS,
-        .config_name = "timex",
-        .enabled = 1,
-        .thread = NULL,
-        .init_routine = NULL,
-        .start_routine = timex_main
-    },
-    {
         .name = "PLUGIN[tc]",
         .config_section = CONFIG_SECTION_PLUGINS,
         .config_name = "tc",
diff --git a/daemon/system-info.sh b/daemon/system-info.sh
index 728e3809..7fb2f25b 100755
--- a/daemon/system-info.sh
+++ b/daemon/system-info.sh
@@ -21,7 +21,7 @@ if [ -z "${VIRTUALIZATION}" ]; then
   if [ -n "$(command -v systemd-detect-virt 2> /dev/null)" ]; then
     VIRTUALIZATION="$(systemd-detect-virt -v)"
     VIRT_DETECTION="systemd-detect-virt"
-    CONTAINER="$(systemd-detect-virt -c)"
+    CONTAINER=${CONTAINER:-$(systemd-detect-virt -c)}
     CONT_DETECTION="systemd-detect-virt"
   else
     if grep -q "^flags.*hypervisor" /proc/cpuinfo 2> /dev/null; then
@@ -153,7 +153,6 @@ if [ "${CONTAINER}" = "unknown" ] || [ "${CONTAINER}" = "none" ]; then
 else
   # Otherwise try and use a user-supplied bind-mount into the container to resolve the host details
   if [ -e "/host/etc/os-release" ]; then
-    OS_DETECTION="/etc/os-release"
     eval "$(grep -E "^(NAME|ID|ID_LIKE|VERSION|VERSION_ID)=" < /host/etc/os-release | sed 's/^/HOST_/')"
     HOST_OS_DETECTION="/host/etc/os-release"
   fi
@@ -197,10 +196,14 @@ if [ -n "${lscpu}" ] && lscpu > /dev/null 2>&1; then
   LCPU_COUNT="$(echo "${lscpu_output}" | grep "^CPU(s):" | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
   CPU_VENDOR="$(echo "${lscpu_output}" | grep "^Vendor ID:" | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
   CPU_MODEL="$(echo "${lscpu_output}" | grep "^Model name:" | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
-  possible_cpu_freq="$(echo "${lscpu_output}" | grep -F "CPU max MHz:" | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | grep -o '^[0-9]*') MHz"
-  if [ "${possible_cpu_freq}" = " MHz" ]; then
-    possible_cpu_freq="$(echo "${lscpu_output}" | grep -F "CPU MHz:" | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | grep -o '^[0-9]*') MHz"
+  possible_cpu_freq="$(echo "${lscpu_output}" | grep -F "CPU max MHz:" | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | grep -o '^[0-9]*')"
+  if [ -z "$possible_cpu_freq" ]; then
+    possible_cpu_freq="$(echo "${lscpu_output}" | grep -F "CPU MHz:" | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | grep -o '^[0-9]*')"
   fi
+  if [ -z "$possible_cpu_freq" ]; then
+    possible_cpu_freq="$(echo "${lscpu_output}" | grep "^Model name:" | grep -Eo "[0-9\.]+GHz" | grep -o "^[0-9\.]*" | awk '{print int($0*1000)}')"
+  fi
+  [ -n "$possible_cpu_freq" ] && possible_cpu_freq="${possible_cpu_freq} MHz"
 elif [ -n "${dmidecode}" ] && dmidecode -t processor > /dev/null 2>&1; then
   dmidecode_output="$(${dmidecode} -t processor 2> /dev/null)"
   CPU_INFO_SOURCE="dmidecode"
@@ -215,6 +218,13 @@ else
   elif [ "${KERNEL_NAME}" = FreeBSD ]; then
     CPU_INFO_SOURCE="sysctl"
     LCPU_COUNT="$(sysctl -n kern.smp.cpus)"
+    if ! possible_cpu_freq=$(sysctl -n machdep.tsc_freq 2> /dev/null); then
+      possible_cpu_freq=$(sysctl -n hw.model 2> /dev/null | grep -Eo "[0-9\.]+GHz" | grep -o "^[0-9\.]*" | awk '{print int($0*1000)}')
+      [ -n "$possible_cpu_freq" ] && possible_cpu_freq="${possible_cpu_freq} MHz"
+    fi
+  elif [ "${KERNEL_NAME}" = Darwin ]; then
+    CPU_INFO_SOURCE="sysctl"
+    LCPU_COUNT="$(sysctl -n hw.logicalcpu)"
   elif [ -d /sys/devices/system/cpu ]; then
     CPU_INFO_SOURCE="sysfs"
     # This is potentially more accurate than checking `/proc/cpuinfo`.
@@ -224,8 +234,15 @@ else
     LCPU_COUNT="$(grep -c ^processor /proc/cpuinfo)"
   fi
 
-  # If we have GNU uname, we can use that to get CPU info (probably).
-  if uname --version 2> /dev/null | grep -qF 'GNU coreutils'; then
+  if [ "${KERNEL_NAME}" = Darwin ]; then
+    CPU_MODEL="$(sysctl -n machdep.cpu.brand_string)"
+    if [ "${ARCHITECTURE}" = "x86_64" ]; then
+      CPU_VENDOR="$(sysctl -n machdep.cpu.vendor)"
+    else
+      CPU_VENDOR="Apple"
+    fi
+    echo "${CPU_INFO_SOURCE}" | grep -qv sysctl && CPU_INFO_SOURCE="${CPU_INFO_SOURCE} sysctl"
+  elif uname --version 2> /dev/null | grep -qF 'GNU coreutils'; then
     CPU_INFO_SOURCE="${CPU_INFO_SOURCE} uname"
     CPU_MODEL="$(uname -p)"
     CPU_VENDOR="$(uname -i)"
@@ -245,12 +262,15 @@ else
   fi
 fi
 
-if [ -r /sys/devices/system/cpu/cpu0/cpufreq/base_frequency ]; then
+if [ "${KERNEL_NAME}" = Darwin ] && [ "${ARCHITECTURE}" = "x86_64" ]; then
+  CPU_FREQ="$(sysctl -n hw.cpufrequency)"
+elif [ -r /sys/devices/system/cpu/cpu0/cpufreq/base_frequency ]; then
   if (echo "${CPU_INFO_SOURCE}" | grep -qv sysfs); then
     CPU_INFO_SOURCE="${CPU_INFO_SOURCE} sysfs"
   fi
 
-  CPU_FREQ="$(cat /sys/devices/system/cpu/cpu0/cpufreq/base_frequency)"
+  value="$(cat /sys/devices/system/cpu/cpu0/cpufreq/base_frequency)"
+  CPU_FREQ="$((value * 1000))"
 elif [ -n "${possible_cpu_freq}" ]; then
   CPU_FREQ="${possible_cpu_freq}"
 elif [ -r /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq ]; then
@@ -258,7 +278,14 @@ elif [ -r /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq ]; then
     CPU_INFO_SOURCE="${CPU_INFO_SOURCE} sysfs"
   fi
 
-  CPU_FREQ="$(cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq)"
+  value="$(cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq)"
+  CPU_FREQ="$((value * 1000))"
+elif [ -r /proc/cpuinfo ]; then
+  if (echo "${CPU_INFO_SOURCE}" | grep -qv procfs); then
+    CPU_INFO_SOURCE="${CPU_INFO_SOURCE} procfs"
+  fi
+  value=$(grep "cpu MHz" /proc/cpuinfo 2>/dev/null | grep -o "[0-9]*" | head -n 1 | awk '{print int($0*1000000)}')
+  [ -n "$value" ] && CPU_FREQ="$value"
 fi
 
 freq_units="$(echo "${CPU_FREQ}" | cut -f 2 -d ' ')"
@@ -376,6 +403,47 @@ elif pgrep "kubelet"; then
   HOST_IS_K8S_NODE="true"
 fi
 
+# ------------------------------------------------------------------------------------------------
+# Detect instance metadata for VMs running on cloud providers
+
+CLOUD_TYPE="unknown"
+CLOUD_INSTANCE_TYPE="unknown"
+CLOUD_INSTANCE_REGION="unknown"
+
+if [ "${VIRTUALIZATION}" != "none" ] && command -v curl > /dev/null 2>&1; then
+  # Try AWS IMDSv2
+  if [ "${CLOUD_TYPE}" = "unknown" ]; then
+    AWS_IMDS_TOKEN="$(curl --fail -s -m 5 --noproxy "*" -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600")"
+    if [ -n "${AWS_IMDS_TOKEN}" ]; then
+      CLOUD_TYPE="AWS"
+      CLOUD_INSTANCE_TYPE="$(curl --fail -s -m 5 --noproxy "*" -H "X-aws-ec2-metadata-token: $AWS_IMDS_TOKEN" -v "http://169.254.169.254/latest/meta-data/instance-type" 2> /dev/null)"
+      CLOUD_INSTANCE_REGION="$(curl --fail -s -m 5 --noproxy "*" -H "X-aws-ec2-metadata-token: $AWS_IMDS_TOKEN" -v "http://169.254.169.254/latest/meta-data/placement/region" 2> /dev/null)"
+    fi
+  fi
+
+  # Try GCE computeMetadata v1
+  if [ "${CLOUD_TYPE}" = "unknown" ]; then
+    if [ -n "$(curl --fail -s -m 5 --noproxy "*" -H "Metadata-Flavor: Google" "http://metadata.google.internal/computeMetadata/v1")" ]; then
+      CLOUD_TYPE="GCP"
+      CLOUD_INSTANCE_TYPE="$(curl --fail -s -m 5 --noproxy "*" -H "Metadata-Flavor: Google" "http://metadata.google.internal/computeMetadata/v1/instance/machine-type")"
+      [ -n "$CLOUD_INSTANCE_TYPE" ] && CLOUD_INSTANCE_TYPE=$(basename "$CLOUD_INSTANCE_TYPE")
+      CLOUD_INSTANCE_REGION="$(curl --fail -s -m 5 --noproxy "*" -H "Metadata-Flavor: Google" "http://metadata.google.internal/computeMetadata/v1/instance/zone")"
+      [ -n "$CLOUD_INSTANCE_REGION" ] && CLOUD_INSTANCE_REGION=$(basename "$CLOUD_INSTANCE_REGION") && CLOUD_INSTANCE_REGION=${CLOUD_INSTANCE_REGION%-*}
+    fi
+  fi
+
+  # TODO: needs to be tested in Microsoft Azure
+  # Try Azure IMDS
+  # if [ "${CLOUD_TYPE}" = "unknown" ]; then
+  #   AZURE_IMDS_DATA="$(curl --fail -s -m 5 -H "Metadata: true" --noproxy "*" "http://169.254.169.254/metadata/instance?version=2021-10-01")"
+  #   if [ -n "${AZURE_IMDS_DATA}" ]; then
+  #     CLOUD_TYPE="Azure"
+  #     CLOUD_INSTANCE_TYPE="$(curl --fail -s -m 5 -H "Metadata: true" --noproxy "*" "http://169.254.169.254/metadata/instance/compute/vmSize?version=2021-10-01&format=text")"
+  #     CLOUD_INSTANCE_REGION="$(curl --fail -s -m 5 -H "Metadata: true" --noproxy "*" "http://169.254.169.254/metadata/instance/compute/location?version=2021-10-01&format=text")"
+  #   fi
+  # fi
+fi
+
 echo "NETDATA_CONTAINER_OS_NAME=${CONTAINER_NAME}"
 echo "NETDATA_CONTAINER_OS_ID=${CONTAINER_ID}"
 echo "NETDATA_CONTAINER_OS_ID_LIKE=${CONTAINER_ID_LIKE}"
@@ -406,3 +474,6 @@ echo "NETDATA_SYSTEM_TOTAL_RAM=${TOTAL_RAM}"
 echo "NETDATA_SYSTEM_RAM_DETECTION=${RAM_DETECTION}"
 echo "NETDATA_SYSTEM_TOTAL_DISK_SIZE=${DISK_SIZE}"
 echo "NETDATA_SYSTEM_DISK_DETECTION=${DISK_DETECTION}"
+echo "NETDATA_INSTANCE_CLOUD_TYPE=${CLOUD_TYPE}"
+echo "NETDATA_INSTANCE_CLOUD_INSTANCE_TYPE=${CLOUD_INSTANCE_TYPE}"
+echo "NETDATA_INSTANCE_CLOUD_INSTANCE_REGION=${CLOUD_INSTANCE_REGION}"
diff --git a/daemon/unit_test.c b/daemon/unit_test.c
index 456dff96..7a52735d 100644
--- a/daemon/unit_test.c
+++ b/daemon/unit_test.c
@@ -404,6 +404,44 @@ int unit_test_buffer() {
     return 0;
 }
 
+int unit_test_static_threads() {
+    struct netdata_static_thread *static_threads = static_threads_get();
+
+    /*
+     * make sure enough static threads have been registered
+     */
+    if (!static_threads) {
+        fprintf(stderr, "empty static_threads array\n");
+        return 1;
+    }
+
+    int n;
+    for (n = 0; static_threads[n].start_routine != NULL; n++) {}
+
+    if (n < 2) {
+        fprintf(stderr, "only %d static threads registered", n);
+        freez(static_threads);
+        return 1;
+    }
+
+    /*
+     * verify that each thread's start routine is unique.
+     */
+    for (int i = 0; i != n - 1; i++) {
+        for (int j = i + 1; j != n; j++) {
+            if (static_threads[i].start_routine != static_threads[j].start_routine)
+                continue;
+
+            fprintf(stderr, "Found duplicate threads with name: %s\n", static_threads[i].name);
+            freez(static_threads);
+            return 1;
+        }
+    }
+
+    freez(static_threads);
+    return 0;
+}
+
 // --------------------------------------------------------------------------------------------------------------------
 
 struct feed_values {
@@ -1521,7 +1559,7 @@ static RRDHOST *dbengine_rrdhost_find_or_create(char *name)
             , netdata_configured_timezone
             , netdata_configured_abbrev_timezone
             , netdata_configured_utc_offset
-            , config_get(CONFIG_SECTION_BACKEND, "host tags", "")
+            , ""
             , program_name
             , program_version
             , default_rrd_update_every
@@ -1694,7 +1732,7 @@ static int test_dbengine_check_rrdr(RRDSET *st[CHARTS], RRDDIM *rd[CHARTS][DIMS]
     update_every = REGION_UPDATE_EVERY[current_region];
     long points = (time_end - time_start) / update_every;
     for (i = 0 ; i < CHARTS ; ++i) {
-        RRDR *r = rrd2rrdr(st[i], points, time_start + update_every, time_end, RRDR_GROUPING_AVERAGE, 0, 0, NULL, NULL);
+        RRDR *r = rrd2rrdr(st[i], points, time_start + update_every, time_end, RRDR_GROUPING_AVERAGE, 0, 0, NULL, NULL, 0);
         if (!r) {
             fprintf(stderr, "    DB-engine unittest %s: empty RRDR ### E R R O R ###\n", st[i]->name);
             return ++errors;
@@ -1813,7 +1851,7 @@ int test_dbengine(void)
     long points = (time_end[REGIONS - 1] - time_start[0]) / update_every; // cover all time regions with RRDR
     long point_offset = (time_start[current_region] - time_start[0]) / update_every;
     for (i = 0 ; i < CHARTS ; ++i) {
-        RRDR *r = rrd2rrdr(st[i], points, time_start[0] + update_every, time_end[REGIONS - 1], RRDR_GROUPING_AVERAGE, 0, 0, NULL, NULL);
+        RRDR *r = rrd2rrdr(st[i], points, time_start[0] + update_every, time_end[REGIONS - 1], RRDR_GROUPING_AVERAGE, 0, 0, NULL, NULL, 0);
         if (!r) {
             fprintf(stderr, "    DB-engine unittest %s: empty RRDR ### E R R O R ###\n", st[i]->name);
             ++errors;
diff --git a/daemon/unit_test.h b/daemon/unit_test.h
index 3a3b6490..6a7a966c 100644
--- a/daemon/unit_test.h
+++ b/daemon/unit_test.h
@@ -8,6 +8,7 @@ extern int unit_test(long delay, long shift);
 extern int run_all_mockup_tests(void);
 extern int unit_test_str2ld(void);
 extern int unit_test_buffer(void);
+extern int unit_test_static_threads(void);
 extern int test_sqlite(void);
 #ifdef ENABLE_DBENGINE
 extern int test_dbengine(void);