Adding upstream version 1.29.3.upstream/1.29.3upstream

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

1 files changed, 1973 insertions, 0 deletions

diff --git a/database/rrdset.c b/database/rrdset.c
new file mode 100644
index 0000000..d16fe73
--- /dev/null
+++ b/database/rrdset.c
@@ -0,0 +1,1973 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define NETDATA_RRD_INTERNALS
+#include "rrd.h"
+#include <sched.h>
+
+void __rrdset_check_rdlock(RRDSET *st, const char *file, const char *function, const unsigned long line) {
+    debug(D_RRD_CALLS, "Checking read lock on chart '%s'", st->id);
+
+    int ret = netdata_rwlock_trywrlock(&st->rrdset_rwlock);
+    if(ret == 0)
+        fatal("RRDSET '%s' should be read-locked, but it is not, at function %s() at line %lu of file '%s'", st->id, function, line, file);
+}
+
+void __rrdset_check_wrlock(RRDSET *st, const char *file, const char *function, const unsigned long line) {
+    debug(D_RRD_CALLS, "Checking write lock on chart '%s'", st->id);
+
+    int ret = netdata_rwlock_tryrdlock(&st->rrdset_rwlock);
+    if(ret == 0)
+        fatal("RRDSET '%s' should be write-locked, but it is not, at function %s() at line %lu of file '%s'", st->id, function, line, file);
+}
+
+
+// ----------------------------------------------------------------------------
+// RRDSET index
+
+int rrdset_compare(void* a, void* b) {
+    if(((RRDSET *)a)->hash < ((RRDSET *)b)->hash) return -1;
+    else if(((RRDSET *)a)->hash > ((RRDSET *)b)->hash) return 1;
+    else return strcmp(((RRDSET *)a)->id, ((RRDSET *)b)->id);
+}
+
+static RRDSET *rrdset_index_find(RRDHOST *host, const char *id, uint32_t hash) {
+    RRDSET tmp;
+    strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
+    tmp.hash = (hash)?hash:simple_hash(tmp.id);
+
+    return (RRDSET *)avl_search_lock(&(host->rrdset_root_index), (avl *) &tmp);
+}
+
+// ----------------------------------------------------------------------------
+// RRDSET name index
+
+#define rrdset_from_avlname(avlname_ptr) ((RRDSET *)((avlname_ptr) - offsetof(RRDSET, avlname)))
+
+int rrdset_compare_name(void* a, void* b) {
+    RRDSET *A = rrdset_from_avlname(a);
+    RRDSET *B = rrdset_from_avlname(b);
+
+    // fprintf(stderr, "COMPARING: %s with %s\n", A->name, B->name);
+
+    if(A->hash_name < B->hash_name) return -1;
+    else if(A->hash_name > B->hash_name) return 1;
+    else return strcmp(A->name, B->name);
+}
+
+RRDSET *rrdset_index_add_name(RRDHOST *host, RRDSET *st) {
+    void *result;
+    // fprintf(stderr, "ADDING: %s (name: %s)\n", st->id, st->name);
+    result = avl_insert_lock(&host->rrdset_root_index_name, (avl *) (&st->avlname));
+    if(result) return rrdset_from_avlname(result);
+    return NULL;
+}
+
+RRDSET *rrdset_index_del_name(RRDHOST *host, RRDSET *st) {
+    void *result;
+    // fprintf(stderr, "DELETING: %s (name: %s)\n", st->id, st->name);
+    result = (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index_name), (avl *)(&st->avlname));
+    if(result) return rrdset_from_avlname(result);
+    return NULL;
+}
+
+
+// ----------------------------------------------------------------------------
+// RRDSET - find charts
+
+static inline RRDSET *rrdset_index_find_name(RRDHOST *host, const char *name, uint32_t hash) {
+    void *result = NULL;
+    RRDSET tmp;
+    tmp.name = name;
+    tmp.hash_name = (hash)?hash:simple_hash(tmp.name);
+
+    // fprintf(stderr, "SEARCHING: %s\n", name);
+    result = avl_search_lock(&host->rrdset_root_index_name, (avl *) (&(tmp.avlname)));
+    if(result) {
+        RRDSET *st = rrdset_from_avlname(result);
+        if(strcmp(st->magic, RRDSET_MAGIC) != 0)
+            error("Search for RRDSET %s returned an invalid RRDSET %s (name %s)", name, st->id, st->name);
+
+        // fprintf(stderr, "FOUND: %s\n", name);
+        return rrdset_from_avlname(result);
+    }
+    // fprintf(stderr, "NOT FOUND: %s\n", name);
+    return NULL;
+}
+
+inline RRDSET *rrdset_find(RRDHOST *host, const char *id) {
+    debug(D_RRD_CALLS, "rrdset_find() for chart '%s' in host '%s'", id, host->hostname);
+    RRDSET *st = rrdset_index_find(host, id, 0);
+    return(st);
+}
+
+inline RRDSET *rrdset_find_bytype(RRDHOST *host, const char *type, const char *id) {
+    debug(D_RRD_CALLS, "rrdset_find_bytype() for chart '%s.%s' in host '%s'", type, id, host->hostname);
+
+    char buf[RRD_ID_LENGTH_MAX + 1];
+    strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
+    strcat(buf, ".");
+    int len = (int) strlen(buf);
+    strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
+
+    return(rrdset_find(host, buf));
+}
+
+inline RRDSET *rrdset_find_byname(RRDHOST *host, const char *name) {
+    debug(D_RRD_CALLS, "rrdset_find_byname() for chart '%s' in host '%s'", name, host->hostname);
+    RRDSET *st = rrdset_index_find_name(host, name, 0);
+    return(st);
+}
+
+// ----------------------------------------------------------------------------
+// RRDSET - rename charts
+
+char *rrdset_strncpyz_name(char *to, const char *from, size_t length) {
+    char c, *p = to;
+
+    while (length-- && (c = *from++)) {
+        if(c != '.' && !isalnum(c))
+            c = '_';
+
+        *p++ = c;
+    }
+
+    *p = '\0';
+
+    return to;
+}
+
+int rrdset_set_name(RRDSET *st, const char *name) {
+    if(unlikely(st->name && !strcmp(st->name, name)))
+        return 1;
+
+    RRDHOST *host = st->rrdhost;
+
+    debug(D_RRD_CALLS, "rrdset_set_name() old: '%s', new: '%s'", st->name?st->name:"", name);
+
+    char b[CONFIG_MAX_VALUE + 1];
+    char n[RRD_ID_LENGTH_MAX + 1];
+
+    snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
+    rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
+
+    if(rrdset_index_find_name(host, b, 0)) {
+        info("RRDSET: chart name '%s' on host '%s' already exists.", b, host->hostname);
+        return 0;
+    }
+
+    if(st->name) {
+        rrdset_index_del_name(host, st);
+        st->name = config_set_default(st->config_section, "name", b);
+        st->hash_name = simple_hash(st->name);
+        rrdsetvar_rename_all(st);
+    }
+    else {
+        st->name = config_get(st->config_section, "name", b);
+        st->hash_name = simple_hash(st->name);
+    }
+
+    rrdset_wrlock(st);
+    RRDDIM *rd;
+    rrddim_foreach_write(rd, st)
+        rrddimvar_rename_all(rd);
+    rrdset_unlock(st);
+
+    if(unlikely(rrdset_index_add_name(host, st) != st))
+        error("RRDSET: INTERNAL ERROR: attempted to index duplicate chart name '%s'", st->name);
+
+    rrdset_flag_clear(st, RRDSET_FLAG_BACKEND_SEND);
+    rrdset_flag_clear(st, RRDSET_FLAG_BACKEND_IGNORE);
+    rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_SEND);
+    rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_IGNORE);
+    rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
+
+    return 2;
+}
+
+inline void rrdset_is_obsolete(RRDSET *st) {
+    if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_ARCHIVED))) {
+        info("Cannot obsolete already archived chart %s", st->name);
+        return;
+    }
+
+    if(unlikely(!(rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE)))) {
+        rrdset_flag_set(st, RRDSET_FLAG_OBSOLETE);
+        rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
+
+        // the chart will not get more updates (data collection)
+        // so, we have to push its definition now
+        rrdset_push_chart_definition_now(st);
+    }
+}
+
+inline void rrdset_isnot_obsolete(RRDSET *st) {
+    if(unlikely((rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE)))) {
+        rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
+        rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
+
+        // the chart will be pushed upstream automatically
+        // due to data collection
+    }
+}
+
+inline void rrdset_update_heterogeneous_flag(RRDSET *st) {
+    RRDHOST *host = st->rrdhost;
+    (void)host;
+
+    RRDDIM *rd;
+
+    rrdset_flag_clear(st, RRDSET_FLAG_HOMOGENEOUS_CHECK);
+
+    RRD_ALGORITHM algorithm = st->dimensions->algorithm;
+    collected_number multiplier = abs(st->dimensions->multiplier);
+    collected_number divisor = abs(st->dimensions->divisor);
+
+    rrddim_foreach_read(rd, st) {
+        if(algorithm != rd->algorithm || multiplier != abs(rd->multiplier) || divisor != abs(rd->divisor)) {
+            if(!rrdset_flag_check(st, RRDSET_FLAG_HETEROGENEOUS)) {
+                #ifdef NETDATA_INTERNAL_CHECKS
+                info("Dimension '%s' added on chart '%s' of host '%s' is not homogeneous to other dimensions already present (algorithm is '%s' vs '%s', multiplier is " COLLECTED_NUMBER_FORMAT " vs " COLLECTED_NUMBER_FORMAT ", divisor is " COLLECTED_NUMBER_FORMAT " vs " COLLECTED_NUMBER_FORMAT ").",
+                        rd->name,
+                        st->name,
+                        host->hostname,
+                        rrd_algorithm_name(rd->algorithm), rrd_algorithm_name(algorithm),
+                        rd->multiplier, multiplier,
+                        rd->divisor, divisor
+                );
+                #endif
+                rrdset_flag_set(st, RRDSET_FLAG_HETEROGENEOUS);
+            }
+            return;
+        }
+    }
+
+    rrdset_flag_clear(st, RRDSET_FLAG_HETEROGENEOUS);
+}
+
+// ----------------------------------------------------------------------------
+// RRDSET - reset a chart
+
+void rrdset_reset(RRDSET *st) {
+    debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
+
+    st->last_collected_time.tv_sec = 0;
+    st->last_collected_time.tv_usec = 0;
+    st->last_updated.tv_sec = 0;
+    st->last_updated.tv_usec = 0;
+    st->current_entry = 0;
+    st->counter = 0;
+    st->counter_done = 0;
+    st->rrddim_page_alignment = 0;
+
+    RRDDIM *rd;
+    rrddim_foreach_read(rd, st) {
+        rd->last_collected_time.tv_sec = 0;
+        rd->last_collected_time.tv_usec = 0;
+        rd->collections_counter = 0;
+        // memset(rd->values, 0, rd->entries * sizeof(storage_number));
+#ifdef ENABLE_DBENGINE
+        if (RRD_MEMORY_MODE_DBENGINE == st->rrd_memory_mode && !rrddim_flag_check(rd, RRDDIM_FLAG_ARCHIVED)) {
+            rrdeng_store_metric_flush_current_page(rd);
+        }
+#endif
+    }
+}
+
+// ----------------------------------------------------------------------------
+// RRDSET - helpers for rrdset_create()
+
+inline long align_entries_to_pagesize(RRD_MEMORY_MODE mode, long entries) {
+    if(unlikely(entries < 5)) entries = 5;
+    if(unlikely(entries > RRD_HISTORY_ENTRIES_MAX)) entries = RRD_HISTORY_ENTRIES_MAX;
+
+    if(unlikely(mode == RRD_MEMORY_MODE_NONE || mode == RRD_MEMORY_MODE_ALLOC))
+        return entries;
+
+    long page = (size_t)sysconf(_SC_PAGESIZE);
+    long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
+    if(unlikely(size % page)) {
+        size -= (size % page);
+        size += page;
+
+        long n = (size - sizeof(RRDDIM)) / sizeof(storage_number);
+        return n;
+    }
+
+    return entries;
+}
+
+static inline void last_collected_time_align(RRDSET *st) {
+    st->last_collected_time.tv_sec -= st->last_collected_time.tv_sec % st->update_every;
+
+    if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_STORE_FIRST)))
+        st->last_collected_time.tv_usec = 0;
+    else
+        st->last_collected_time.tv_usec = 500000;
+}
+
+static inline void last_updated_time_align(RRDSET *st) {
+    st->last_updated.tv_sec -= st->last_updated.tv_sec % st->update_every;
+    st->last_updated.tv_usec = 0;
+}
+
+// ----------------------------------------------------------------------------
+// RRDSET - free a chart
+
+void rrdset_free(RRDSET *st) {
+    if(unlikely(!st)) return;
+
+    RRDHOST *host = st->rrdhost;
+
+    rrdhost_check_wrlock(host);  // make sure we have a write lock on the host
+    rrdset_wrlock(st);                  // lock this RRDSET
+    // info("Removing chart '%s' ('%s')", st->id, st->name);
+
+    // ------------------------------------------------------------------------
+    // remove it from the indexes
+
+    if(unlikely(rrdset_index_del(host, st) != st))
+        error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
+
+    rrdset_index_del_name(host, st);
+
+    // ------------------------------------------------------------------------
+    // free its children structures
+
+    freez(st->exporting_flags);
+
+    while(st->variables)  rrdsetvar_free(st->variables);
+//  while(st->alarms)     rrdsetcalc_unlink(st->alarms);
+    /* We must free all connected alarms here in case this has been an ephemeral chart whose alarm was
+     * created by a template. This leads to an effective memory leak, which cannot be detected since the
+     * alarms will still be connected to the host, and freed during shutdown. */
+    while(st->alarms)     rrdcalc_unlink_and_free(st->rrdhost, st->alarms);
+    while(st->dimensions) rrddim_free(st, st->dimensions);
+
+    rrdfamily_free(host, st->rrdfamily);
+
+    debug(D_RRD_CALLS, "RRDSET: Cleaning up remaining chart variables for host '%s', chart '%s'", host->hostname, st->id);
+    rrdvar_free_remaining_variables(host, &st->rrdvar_root_index);
+
+    // ------------------------------------------------------------------------
+    // remove it from the configuration
+
+    appconfig_section_destroy_non_loaded(&netdata_config, st->config_section);
+
+    // ------------------------------------------------------------------------
+    // unlink it from the host
+
+    if(st == host->rrdset_root) {
+        host->rrdset_root = st->next;
+    }
+    else {
+        // find the previous one
+        RRDSET *s;
+        for(s = host->rrdset_root; s && s->next != st ; s = s->next) ;
+
+        // bypass it
+        if(s) s->next = st->next;
+        else error("Request to free RRDSET '%s': cannot find it under host '%s'", st->id, host->hostname);
+    }
+
+    rrdset_unlock(st);
+
+    // ------------------------------------------------------------------------
+    // free it
+
+    netdata_rwlock_destroy(&st->rrdset_rwlock);
+    netdata_rwlock_destroy(&st->state->labels.labels_rwlock);
+
+    // free directly allocated members
+    freez(st->config_section);
+    freez(st->plugin_name);
+    freez(st->module_name);
+    freez(st->state->old_title);
+    freez(st->state->old_context);
+    free_label_list(st->state->labels.head);
+    freez(st->state);
+
+    switch(st->rrd_memory_mode) {
+        case RRD_MEMORY_MODE_SAVE:
+        case RRD_MEMORY_MODE_MAP:
+        case RRD_MEMORY_MODE_RAM:
+            debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
+            munmap(st, st->memsize);
+            break;
+
+        case RRD_MEMORY_MODE_ALLOC:
+        case RRD_MEMORY_MODE_NONE:
+        case RRD_MEMORY_MODE_DBENGINE:
+#ifdef ENABLE_DBENGINE
+            if (st->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE)
+                freez(st->chart_uuid);
+#endif
+            freez(st);
+            break;
+    }
+
+}
+
+void rrdset_save(RRDSET *st) {
+    rrdset_check_rdlock(st);
+
+    // info("Saving chart '%s' ('%s')", st->id, st->name);
+
+    if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
+        debug(D_RRD_STATS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
+        memory_file_save(st->cache_filename, st, st->memsize);
+    }
+
+    RRDDIM *rd;
+    rrddim_foreach_read(rd, st) {
+        if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE)) {
+            debug(D_RRD_STATS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
+            memory_file_save(rd->cache_filename, rd, rd->memsize);
+        }
+    }
+}
+
+void rrdset_delete_custom(RRDSET *st, int db_rotated) {
+    RRDDIM *rd;
+#ifndef ENABLE_ACLK
+    UNUSED(db_rotated);
+#endif
+    rrdset_check_rdlock(st);
+
+    info("Deleting chart '%s' ('%s') from disk...", st->id, st->name);
+
+    if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || st->rrd_memory_mode == RRD_MEMORY_MODE_MAP) {
+        info("Deleting chart header file '%s'.", st->cache_filename);
+        if(unlikely(unlink(st->cache_filename) == -1))
+            error("Cannot delete chart header file '%s'", st->cache_filename);
+    }
+
+    rrddim_foreach_read(rd, st) {
+        if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || rd->rrd_memory_mode == RRD_MEMORY_MODE_MAP)) {
+            info("Deleting dimension file '%s'.", rd->cache_filename);
+            if(unlikely(unlink(rd->cache_filename) == -1))
+                error("Cannot delete dimension file '%s'", rd->cache_filename);
+        }
+    }
+
+    recursively_delete_dir(st->cache_dir, "left-over chart");
+#ifdef ENABLE_ACLK
+    if ((netdata_cloud_setting) && (db_rotated || RRD_MEMORY_MODE_DBENGINE != st->rrd_memory_mode)) {
+        aclk_del_collector(st->rrdhost, st->plugin_name, st->module_name);
+        aclk_update_chart(st->rrdhost, st->id, ACLK_CMD_CHARTDEL);
+    }
+#endif
+
+}
+
+void rrdset_delete_obsolete_dimensions(RRDSET *st) {
+    RRDDIM *rd;
+
+    rrdset_check_rdlock(st);
+
+    info("Deleting dimensions of chart '%s' ('%s') from disk...", st->id, st->name);
+
+    rrddim_foreach_read(rd, st) {
+        if(rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE)) {
+            if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || rd->rrd_memory_mode == RRD_MEMORY_MODE_MAP)) {
+                info("Deleting dimension file '%s'.", rd->cache_filename);
+                if(unlikely(unlink(rd->cache_filename) == -1))
+                    error("Cannot delete dimension file '%s'", rd->cache_filename);
+            }
+        }
+    }
+}
+
+// ----------------------------------------------------------------------------
+// RRDSET - create a chart
+
+static inline RRDSET *rrdset_find_on_create(RRDHOST *host, const char *fullid) {
+    RRDSET *st = rrdset_find(host, fullid);
+    if(unlikely(st)) {
+        rrdset_isnot_obsolete(st);
+        debug(D_RRD_CALLS, "RRDSET '%s', already exists.", fullid);
+        return st;
+    }
+
+    return NULL;
+}
+
+RRDSET *rrdset_create_custom(
+          RRDHOST *host
+        , const char *type
+        , const char *id
+        , const char *name
+        , const char *family
+        , const char *context
+        , const char *title
+        , const char *units
+        , const char *plugin
+        , const char *module
+        , long priority
+        , int update_every
+        , RRDSET_TYPE chart_type
+        , RRD_MEMORY_MODE memory_mode
+        , long history_entries
+) {
+    if(!type || !type[0]) {
+        fatal("Cannot create rrd stats without a type: id '%s', name '%s', family '%s', context '%s', title '%s', units '%s', plugin '%s', module '%s'."
+              , (id && *id)?id:"<unset>"
+              , (name && *name)?name:"<unset>"
+              , (family && *family)?family:"<unset>"
+              , (context && *context)?context:"<unset>"
+              , (title && *title)?title:"<unset>"
+              , (units && *units)?units:"<unset>"
+              , (plugin && *plugin)?plugin:"<unset>"
+              , (module && *module)?module:"<unset>"
+        );
+        return NULL;
+    }
+
+    if(!id || !id[0]) {
+        fatal("Cannot create rrd stats without an id: type '%s', name '%s', family '%s', context '%s', title '%s', units '%s', plugin '%s', module '%s'."
+              , type
+              , (name && *name)?name:"<unset>"
+              , (family && *family)?family:"<unset>"
+              , (context && *context)?context:"<unset>"
+              , (title && *title)?title:"<unset>"
+              , (units && *units)?units:"<unset>"
+              , (plugin && *plugin)?plugin:"<unset>"
+              , (module && *module)?module:"<unset>"
+        );
+        return NULL;
+    }
+
+    // ------------------------------------------------------------------------
+    // check if it already exists
+
+    char fullid[RRD_ID_LENGTH_MAX + 1];
+    snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
+
+    int changed_from_archived_to_active = 0;
+    RRDSET *st = rrdset_find_on_create(host, fullid);
+    if (st) {
+        int mark_rebuild = 0;
+        rrdset_flag_set(st, RRDSET_FLAG_SYNC_CLOCK);
+        rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
+        if (rrdset_flag_check(st, RRDSET_FLAG_ARCHIVED)) {
+            rrdset_flag_clear(st, RRDSET_FLAG_ARCHIVED);
+            changed_from_archived_to_active = 1;
+            mark_rebuild |= META_CHART_ACTIVATED;
+        }
+        char *old_plugin = NULL, *old_module = NULL, *old_title = NULL, *old_context = NULL,
+             *old_title_v = NULL, *old_context_v = NULL;
+        int rc;
+
+        if(unlikely(name))
+            rc = rrdset_set_name(st, name);
+        else
+            rc = rrdset_set_name(st, id);
+
+        if (rc == 2)
+            mark_rebuild |= META_CHART_UPDATED;
+
+        if (unlikely(st->priority != priority)) {
+            st->priority = priority;
+            mark_rebuild |= META_CHART_UPDATED;
+        }
+        if (unlikely(st->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE && st->update_every != update_every)) {
+            st->update_every = update_every;
+            mark_rebuild |= META_CHART_UPDATED;
+        }
+
+        if (plugin && st->plugin_name) {
+            if (unlikely(strcmp(plugin, st->plugin_name))) {
+                old_plugin = st->plugin_name;
+                st->plugin_name = strdupz(plugin);
+                mark_rebuild |= META_PLUGIN_UPDATED;
+            }
+        } else {
+            if (plugin != st->plugin_name) { // one is NULL?
+                old_plugin = st->plugin_name;
+                st->plugin_name = plugin ? strdupz(plugin) : NULL;
+                mark_rebuild |= META_PLUGIN_UPDATED;
+            }
+        }
+
+        if (module && st->module_name) {
+            if (unlikely(strcmp(module, st->module_name))) {
+                old_module = st->module_name;
+                st->module_name = strdupz(module);
+                mark_rebuild |= META_MODULE_UPDATED;
+            }
+        } else {
+            if (module != st->module_name) {
+                if (st->module_name && *st->module_name) {
+                    old_module = st->module_name;
+                    st->module_name = module ? strdupz(module) : NULL;
+                    mark_rebuild |= META_MODULE_UPDATED;
+                }
+            }
+        }
+
+        if (unlikely(title && st->state->old_title && strcmp(st->state->old_title, title))) {
+            char *new_title = strdupz(title);
+            old_title_v = st->state->old_title;
+            st->state->old_title = strdupz(title);
+            json_fix_string(new_title);
+            old_title = st->title;
+            st->title = new_title;
+            mark_rebuild |= META_CHART_UPDATED;
+        }
+
+        RRDSET_TYPE new_chart_type =
+            rrdset_type_id(config_get(st->config_section, "chart type", rrdset_type_name(chart_type)));
+        if (st->chart_type != new_chart_type) {
+            st->chart_type = new_chart_type;
+            mark_rebuild |= META_CHART_UPDATED;
+        }
+
+        if (unlikely(context && st->state->old_context && strcmp(st->state->old_context, context))) {
+            char *new_context = strdupz(context);
+            old_context_v = st->state->old_context;
+            st->state->old_context = strdupz(context);
+            json_fix_string(new_context);
+            old_context = st->context;
+            st->context = new_context;
+            st->hash_context = simple_hash(st->context);
+            mark_rebuild |= META_CHART_UPDATED;
+        }
+
+        if (mark_rebuild) {
+#ifdef ENABLE_ACLK
+            if (netdata_cloud_setting) {
+                if (mark_rebuild & META_CHART_ACTIVATED) {
+                    aclk_add_collector(host, st->plugin_name, st->module_name);
+                }
+                else {
+                    if (mark_rebuild & (META_PLUGIN_UPDATED | META_MODULE_UPDATED)) {
+                        aclk_del_collector(
+                            host, mark_rebuild & META_PLUGIN_UPDATED ? old_plugin : st->plugin_name,
+                            mark_rebuild & META_MODULE_UPDATED ? old_module : st->module_name);
+                        aclk_add_collector(host, st->plugin_name, st->module_name);
+                    }
+                }
+                rrdset_flag_set(st, RRDSET_FLAG_ACLK);
+            }
+#endif
+            freez(old_plugin);
+            freez(old_module);
+            freez(old_title);
+            freez(old_context);
+            freez(old_title_v);
+            freez(old_context_v);
+            if (mark_rebuild != META_CHART_ACTIVATED) {
+                info("Collector updated metadata for chart %s", st->id);
+                sched_yield();
+            }
+        }
+#ifdef ENABLE_DBENGINE
+        if (st->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE &&
+            (mark_rebuild & (META_CHART_UPDATED | META_PLUGIN_UPDATED | META_MODULE_UPDATED))) {
+            debug(D_METADATALOG, "CHART [%s] metadata updated", st->id);
+            int rc = update_chart_metadata(st->chart_uuid, st, id, name);
+            if (unlikely(rc))
+                error_report("Failed to update chart metadata in the database");
+        }
+#endif
+        /* Fall-through during switch from archived to active so that the host lock is taken and health is linked */
+        if (!changed_from_archived_to_active)
+            return st;
+    }
+
+    rrdhost_wrlock(host);
+
+    st = rrdset_find_on_create(host, fullid);
+    if(st) {
+        if (changed_from_archived_to_active) {
+            rrdset_flag_clear(st, RRDSET_FLAG_ARCHIVED);
+            rrdsetvar_create(st, "last_collected_t",    RRDVAR_TYPE_TIME_T,     &st->last_collected_time.tv_sec, RRDVAR_OPTION_DEFAULT);
+            rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL,      &st->last_collected_total,       RRDVAR_OPTION_DEFAULT);
+            rrdsetvar_create(st, "green",               RRDVAR_TYPE_CALCULATED, &st->green,                      RRDVAR_OPTION_DEFAULT);
+            rrdsetvar_create(st, "red",                 RRDVAR_TYPE_CALCULATED, &st->red,                        RRDVAR_OPTION_DEFAULT);
+            rrdsetvar_create(st, "update_every",        RRDVAR_TYPE_INT,        &st->update_every,               RRDVAR_OPTION_DEFAULT);
+            rrdsetcalc_link_matching(st);
+            rrdcalctemplate_link_matching(st);
+        }
+        rrdhost_unlock(host);
+        rrdset_flag_set(st, RRDSET_FLAG_SYNC_CLOCK);
+        rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
+        return st;
+    }
+
+    char fullfilename[FILENAME_MAX + 1];
+
+    // ------------------------------------------------------------------------
+    // compose the config_section for this chart
+
+    char config_section[RRD_ID_LENGTH_MAX + 1];
+    if(host == localhost)
+        strcpy(config_section, fullid);
+    else
+        snprintfz(config_section, RRD_ID_LENGTH_MAX, "%s/%s", host->machine_guid, fullid);
+
+    // ------------------------------------------------------------------------
+    // get the options from the config, we need to create it
+
+    long entries;
+    if(memory_mode == RRD_MEMORY_MODE_DBENGINE) {
+        // only sets it the first time
+        entries = config_get_number(config_section, "history", 5);
+    } else {
+        long rentries = config_get_number(config_section, "history", history_entries);
+        entries = align_entries_to_pagesize(memory_mode, rentries);
+        if (entries != rentries) entries = config_set_number(config_section, "history", entries);
+
+        if (memory_mode == RRD_MEMORY_MODE_NONE && entries != rentries)
+            entries = config_set_number(config_section, "history", 10);
+    }
+    int enabled = config_get_boolean(config_section, "enabled", 1);
+    if(!enabled) entries = 5;
+
+    unsigned long size = sizeof(RRDSET);
+    char *cache_dir = rrdset_cache_dir(host, fullid, config_section);
+
+    time_t now = now_realtime_sec();
+
+    // ------------------------------------------------------------------------
+    // load it or allocate it
+
+    debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
+
+    snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
+    if(memory_mode == RRD_MEMORY_MODE_SAVE || memory_mode == RRD_MEMORY_MODE_MAP ||
+       memory_mode == RRD_MEMORY_MODE_RAM) {
+        st = (RRDSET *) mymmap(
+                  (memory_mode == RRD_MEMORY_MODE_RAM) ? NULL : fullfilename
+                , size
+                , ((memory_mode == RRD_MEMORY_MODE_MAP) ? MAP_SHARED : MAP_PRIVATE)
+                , 0
+        );
+
+        if(st) {
+            memset(&st->avl, 0, sizeof(avl));
+            memset(&st->avlname, 0, sizeof(avl));
+            memset(&st->rrdvar_root_index, 0, sizeof(avl_tree_lock));
+            memset(&st->dimensions_index, 0, sizeof(avl_tree_lock));
+            memset(&st->rrdset_rwlock, 0, sizeof(netdata_rwlock_t));
+
+            st->name = NULL;
+            st->config_section = NULL;
+            st->type = NULL;
+            st->family = NULL;
+            st->title = NULL;
+            st->units = NULL;
+            st->context = NULL;
+            st->cache_dir = NULL;
+            st->plugin_name = NULL;
+            st->module_name = NULL;
+            st->dimensions = NULL;
+            st->rrdfamily = NULL;
+            st->rrdhost = NULL;
+            st->next = NULL;
+            st->variables = NULL;
+            st->alarms = NULL;
+            st->flags = 0x00000000;
+            st->exporting_flags = NULL;
+
+            if(memory_mode == RRD_MEMORY_MODE_RAM) {
+                memset(st, 0, size);
+            }
+            else {
+                if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
+                    info("Initializing file %s.", fullfilename);
+                    memset(st, 0, size);
+                }
+                else if(strcmp(st->id, fullid) != 0) {
+                    error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
+                    // munmap(st, size);
+                    // st = NULL;
+                    memset(st, 0, size);
+                }
+                else if(st->memsize != size || st->entries != entries) {
+                    error("File %s does not have the desired size. Clearing it.", fullfilename);
+                    memset(st, 0, size);
+                }
+                else if(st->update_every != update_every) {
+                    error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
+                    memset(st, 0, size);
+                }
+                else if((now - st->last_updated.tv_sec) > update_every * entries) {
+                    info("File %s is too old. Clearing it.", fullfilename);
+                    memset(st, 0, size);
+                }
+                else if(st->last_updated.tv_sec > now + update_every) {
+                    error("File %s refers to the future by %zd secs. Resetting it to now.", fullfilename, (ssize_t)(st->last_updated.tv_sec - now));
+                    st->last_updated.tv_sec = now;
+                }
+
+                // make sure the database is aligned
+                if(st->last_updated.tv_sec) {
+                    st->update_every = update_every;
+                    last_updated_time_align(st);
+                }
+            }
+
+            // make sure we have the right memory mode
+            // even if we cleared the memory
+            st->rrd_memory_mode = memory_mode;
+        }
+    }
+
+    if(unlikely(!st)) {
+        st = callocz(1, size);
+        if (memory_mode == RRD_MEMORY_MODE_DBENGINE)
+            st->rrd_memory_mode = RRD_MEMORY_MODE_DBENGINE;
+        else
+            st->rrd_memory_mode = (memory_mode == RRD_MEMORY_MODE_NONE) ? RRD_MEMORY_MODE_NONE : RRD_MEMORY_MODE_ALLOC;
+    }
+
+    st->plugin_name = plugin?strdupz(plugin):NULL;
+    st->module_name = module?strdupz(module):NULL;
+
+    st->config_section = strdupz(config_section);
+    st->rrdhost = host;
+    st->memsize = size;
+    st->entries = entries;
+    st->update_every = update_every;
+
+    if(st->current_entry >= st->entries) st->current_entry = 0;
+
+    strcpy(st->cache_filename, fullfilename);
+    strcpy(st->magic, RRDSET_MAGIC);
+
+    strcpy(st->id, fullid);
+    st->hash = simple_hash(st->id);
+
+    st->cache_dir = cache_dir;
+
+    st->chart_type = rrdset_type_id(config_get(st->config_section, "chart type", rrdset_type_name(chart_type)));
+    st->type       = config_get(st->config_section, "type", type);
+
+    st->state = callocz(1, sizeof(*st->state));
+    st->family     = config_get(st->config_section, "family", family?family:st->type);
+    json_fix_string(st->family);
+
+    st->units      = config_get(st->config_section, "units", units?units:"");
+    json_fix_string(st->units);
+
+    st->context    = config_get(st->config_section, "context", context?context:st->id);
+    st->state->old_context = strdupz(st->context);
+    json_fix_string(st->context);
+    st->hash_context = simple_hash(st->context);
+
+    st->priority = config_get_number(st->config_section, "priority", priority);
+    if(enabled)
+        rrdset_flag_set(st, RRDSET_FLAG_ENABLED);
+    else
+        rrdset_flag_clear(st, RRDSET_FLAG_ENABLED);
+
+    rrdset_flag_clear(st, RRDSET_FLAG_DETAIL);
+    rrdset_flag_clear(st, RRDSET_FLAG_DEBUG);
+    rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
+    rrdset_flag_clear(st, RRDSET_FLAG_BACKEND_SEND);
+    rrdset_flag_clear(st, RRDSET_FLAG_BACKEND_IGNORE);
+    rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_SEND);
+    rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_IGNORE);
+    rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
+    rrdset_flag_set(st, RRDSET_FLAG_SYNC_CLOCK);
+
+    // if(!strcmp(st->id, "disk_util.dm-0")) {
+    //     st->debug = 1;
+    //     error("enabled debugging for '%s'", st->id);
+    // }
+    // else error("not enabled debugging for '%s'", st->id);
+
+    st->green = NAN;
+    st->red = NAN;
+
+    st->last_collected_time.tv_sec = 0;
+    st->last_collected_time.tv_usec = 0;
+    st->counter_done = 0;
+    st->rrddim_page_alignment = 0;
+
+    st->gap_when_lost_iterations_above = (int) (gap_when_lost_iterations_above + 2);
+
+    st->last_accessed_time = 0;
+    st->upstream_resync_time = 0;
+
+    avl_init_lock(&st->dimensions_index, rrddim_compare);
+    avl_init_lock(&st->rrdvar_root_index, rrdvar_compare);
+
+    netdata_rwlock_init(&st->rrdset_rwlock);
+    netdata_rwlock_init(&st->state->labels.labels_rwlock);
+
+    if(name && *name && rrdset_set_name(st, name))
+        // we did set the name
+        ;
+    else
+        // could not use the name, use the id
+        rrdset_set_name(st, id);
+
+    st->title = config_get(st->config_section, "title", title);
+    st->state->old_title = strdupz(st->title);
+    json_fix_string(st->title);
+
+    st->rrdfamily = rrdfamily_create(host, st->family);
+
+    st->next = host->rrdset_root;
+    host->rrdset_root = st;
+
+    if(host->health_enabled) {
+        rrdsetvar_create(st, "last_collected_t",    RRDVAR_TYPE_TIME_T,     &st->last_collected_time.tv_sec, RRDVAR_OPTION_DEFAULT);
+        rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL,      &st->last_collected_total,       RRDVAR_OPTION_DEFAULT);
+        rrdsetvar_create(st, "green",               RRDVAR_TYPE_CALCULATED, &st->green,                      RRDVAR_OPTION_DEFAULT);
+        rrdsetvar_create(st, "red",                 RRDVAR_TYPE_CALCULATED, &st->red,                        RRDVAR_OPTION_DEFAULT);
+        rrdsetvar_create(st, "update_every",        RRDVAR_TYPE_INT,        &st->update_every,               RRDVAR_OPTION_DEFAULT);
+    }
+
+    if(unlikely(rrdset_index_add(host, st) != st))
+        error("RRDSET: INTERNAL ERROR: attempt to index duplicate chart '%s'", st->id);
+
+    rrdsetcalc_link_matching(st);
+    rrdcalctemplate_link_matching(st);
+#ifdef ENABLE_DBENGINE
+    if (st->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE) {
+        st->chart_uuid = find_chart_uuid(host, type, id, name);
+        if (unlikely(!st->chart_uuid))
+            st->chart_uuid = create_chart_uuid(st, id, name);
+
+        store_active_chart(st->chart_uuid);
+    }
+#endif
+
+    rrdhost_cleanup_obsolete_charts(host);
+
+    rrdhost_unlock(host);
+#ifdef ENABLE_ACLK
+    if (netdata_cloud_setting)
+        aclk_add_collector(host, plugin, module);
+    rrdset_flag_set(st, RRDSET_FLAG_ACLK);
+#endif
+    return(st);
+}
+
+
+// ----------------------------------------------------------------------------
+// RRDSET - data collection iteration control
+
+inline void rrdset_next_usec_unfiltered(RRDSET *st, usec_t microseconds) {
+    if(unlikely(!st->last_collected_time.tv_sec || !microseconds || (rrdset_flag_check_noatomic(st, RRDSET_FLAG_SYNC_CLOCK)))) {
+        // call the full next_usec() function
+        rrdset_next_usec(st, microseconds);
+        return;
+    }
+
+    st->usec_since_last_update = microseconds;
+}
+
+inline void rrdset_next_usec(RRDSET *st, usec_t microseconds) {
+    struct timeval now;
+    now_realtime_timeval(&now);
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+    char *discard_reason = NULL;
+    usec_t discarded = microseconds;
+    #endif
+
+    if(unlikely(rrdset_flag_check_noatomic(st, RRDSET_FLAG_SYNC_CLOCK))) {
+        // the chart needs to be re-synced to current time
+        rrdset_flag_clear(st, RRDSET_FLAG_SYNC_CLOCK);
+
+        // discard the microseconds supplied
+        microseconds = 0;
+
+        #ifdef NETDATA_INTERNAL_CHECKS
+        if(!discard_reason) discard_reason = "SYNC CLOCK FLAG";
+        #endif
+    }
+
+    if(unlikely(!st->last_collected_time.tv_sec)) {
+        // the first entry
+        microseconds = st->update_every * USEC_PER_SEC;
+        #ifdef NETDATA_INTERNAL_CHECKS
+        if(!discard_reason) discard_reason = "FIRST DATA COLLECTION";
+        #endif
+    }
+    else if(unlikely(!microseconds)) {
+        // no dt given by the plugin
+        microseconds = dt_usec(&now, &st->last_collected_time);
+        #ifdef NETDATA_INTERNAL_CHECKS
+        if(!discard_reason) discard_reason = "NO USEC GIVEN BY COLLECTOR";
+        #endif
+    }
+    else {
+        // microseconds has the time since the last collection
+        susec_t since_last_usec = dt_usec_signed(&now, &st->last_collected_time);
+
+        if(unlikely(since_last_usec < 0)) {
+            // oops! the database is in the future
+            info("RRD database for chart '%s' on host '%s' is %0.5" LONG_DOUBLE_MODIFIER " secs in the future (counter #%zu, update #%zu). Adjusting it to current time.", st->id, st->rrdhost->hostname, (LONG_DOUBLE)-since_last_usec / USEC_PER_SEC, st->counter, st->counter_done);
+
+            st->last_collected_time.tv_sec  = now.tv_sec - st->update_every;
+            st->last_collected_time.tv_usec = now.tv_usec;
+            last_collected_time_align(st);
+
+            st->last_updated.tv_sec  = now.tv_sec - st->update_every;
+            st->last_updated.tv_usec = now.tv_usec;
+            last_updated_time_align(st);
+
+            microseconds    = st->update_every * USEC_PER_SEC;
+            #ifdef NETDATA_INTERNAL_CHECKS
+            if(!discard_reason) discard_reason = "COLLECTION TIME IN FUTURE";
+            #endif
+        }
+        else if(unlikely((usec_t)since_last_usec > (usec_t)(st->update_every * 5 * USEC_PER_SEC))) {
+            // oops! the database is too far behind
+            info("RRD database for chart '%s' on host '%s' is %0.5" LONG_DOUBLE_MODIFIER " secs in the past (counter #%zu, update #%zu). Adjusting it to current time.", st->id, st->rrdhost->hostname, (LONG_DOUBLE)since_last_usec / USEC_PER_SEC, st->counter, st->counter_done);
+
+            microseconds = (usec_t)since_last_usec;
+            #ifdef NETDATA_INTERNAL_CHECKS
+            if(!discard_reason) discard_reason = "COLLECTION TIME TOO FAR IN THE PAST";
+            #endif
+        }
+
+#ifdef NETDATA_INTERNAL_CHECKS
+        if(since_last_usec > 0 && (susec_t)microseconds < since_last_usec) {
+            static __thread susec_t min_delta = USEC_PER_SEC * 3600, permanent_min_delta = 0;
+            static __thread time_t last_t = 0;
+
+            // the first time initialize it so that it will make the check later
+            if(last_t == 0) last_t = now.tv_sec + 60;
+
+            susec_t delta = since_last_usec - (susec_t)microseconds;
+            if(delta < min_delta) min_delta = delta;
+
+            if(now.tv_sec >= last_t + 60) {
+                last_t = now.tv_sec;
+
+                if(min_delta > permanent_min_delta) {
+                    info("MINIMUM MICROSECONDS DELTA of thread %d increased from %lld to %lld (+%lld)", gettid(), permanent_min_delta, min_delta, min_delta - permanent_min_delta);
+                    permanent_min_delta = min_delta;
+                }
+
+                min_delta = USEC_PER_SEC * 3600;
+            }
+        }
+#endif
+    }
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+    debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
+    rrdset_debug(st, "NEXT: %llu microseconds", microseconds);
+
+    if(discarded && discarded != microseconds)
+        info("host '%s', chart '%s': discarded data collection time of %llu usec, replaced with %llu usec, reason: '%s'", st->rrdhost->hostname, st->id, discarded, microseconds, discard_reason?discard_reason:"UNDEFINED");
+
+    #endif
+
+    st->usec_since_last_update = microseconds;
+}
+
+
+// ----------------------------------------------------------------------------
+// RRDSET - process the collected values for all dimensions of a chart
+
+static inline usec_t rrdset_init_last_collected_time(RRDSET *st) {
+    now_realtime_timeval(&st->last_collected_time);
+    last_collected_time_align(st);
+
+    usec_t last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+    rrdset_debug(st, "initialized last collected time to %0.3" LONG_DOUBLE_MODIFIER, (LONG_DOUBLE)last_collect_ut / USEC_PER_SEC);
+    #endif
+
+    return last_collect_ut;
+}
+
+static inline usec_t rrdset_update_last_collected_time(RRDSET *st) {
+    usec_t last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
+    usec_t ut = last_collect_ut + st->usec_since_last_update;
+    st->last_collected_time.tv_sec = (time_t) (ut / USEC_PER_SEC);
+    st->last_collected_time.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+    rrdset_debug(st, "updated last collected time to %0.3" LONG_DOUBLE_MODIFIER, (LONG_DOUBLE)last_collect_ut / USEC_PER_SEC);
+    #endif
+
+    return last_collect_ut;
+}
+
+static inline usec_t rrdset_init_last_updated_time(RRDSET *st) {
+    // copy the last collected time to last updated time
+    st->last_updated.tv_sec  = st->last_collected_time.tv_sec;
+    st->last_updated.tv_usec = st->last_collected_time.tv_usec;
+
+    if(rrdset_flag_check(st, RRDSET_FLAG_STORE_FIRST))
+        st->last_updated.tv_sec -= st->update_every;
+
+    last_updated_time_align(st);
+
+    usec_t last_updated_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+    rrdset_debug(st, "initialized last updated time to %0.3" LONG_DOUBLE_MODIFIER, (LONG_DOUBLE)last_updated_ut / USEC_PER_SEC);
+    #endif
+
+    return last_updated_ut;
+}
+
+static inline size_t rrdset_done_interpolate(
+        RRDSET *st
+        , usec_t update_every_ut
+        , usec_t last_stored_ut
+        , usec_t next_store_ut
+        , usec_t last_collect_ut
+        , usec_t now_collect_ut
+        , char store_this_entry
+        , uint32_t storage_flags
+) {
+    RRDDIM *rd;
+
+    size_t stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
+
+    usec_t first_ut = last_stored_ut, last_ut = 0;
+    (void)first_ut;
+
+    ssize_t iterations = (ssize_t)((now_collect_ut - last_stored_ut) / (update_every_ut));
+    if((now_collect_ut % (update_every_ut)) == 0) iterations++;
+
+    size_t counter = st->counter;
+    long current_entry = st->current_entry;
+
+    for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
+
+        #ifdef NETDATA_INTERNAL_CHECKS
+        if(iterations < 0) { error("INTERNAL CHECK: %s: iterations calculation wrapped! first_ut = %llu, last_stored_ut = %llu, next_store_ut = %llu, now_collect_ut = %llu", st->name, first_ut, last_stored_ut, next_store_ut, now_collect_ut); }
+        rrdset_debug(st, "last_stored_ut = %0.3" LONG_DOUBLE_MODIFIER " (last updated time)", (LONG_DOUBLE)last_stored_ut/USEC_PER_SEC);
+        rrdset_debug(st, "next_store_ut  = %0.3" LONG_DOUBLE_MODIFIER " (next interpolation point)", (LONG_DOUBLE)next_store_ut/USEC_PER_SEC);
+        #endif
+
+        last_ut = next_store_ut;
+
+        rrddim_foreach_read(rd, st) {
+            if (rrddim_flag_check(rd, RRDDIM_FLAG_ARCHIVED))
+                continue;
+
+            calculated_number new_value;
+
+            switch(rd->algorithm) {
+                case RRD_ALGORITHM_INCREMENTAL:
+                    new_value = (calculated_number)
+                            (      rd->calculated_value
+                                   * (calculated_number)(next_store_ut - last_collect_ut)
+                                   / (calculated_number)(now_collect_ut - last_collect_ut)
+                            );
+
+                    #ifdef NETDATA_INTERNAL_CHECKS
+                    rrdset_debug(st, "%s: CALC2 INC "
+                                CALCULATED_NUMBER_FORMAT " = "
+                                CALCULATED_NUMBER_FORMAT
+                                " * (%llu - %llu)"
+                                " / (%llu - %llu)"
+                              , rd->name
+                              , new_value
+                              , rd->calculated_value
+                              , next_store_ut, last_collect_ut
+                              , now_collect_ut, last_collect_ut
+                    );
+                    #endif
+
+                    rd->calculated_value -= new_value;
+                    new_value += rd->last_calculated_value;
+                    rd->last_calculated_value = 0;
+                    new_value /= (calculated_number)st->update_every;
+
+                    if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
+
+                        #ifdef NETDATA_INTERNAL_CHECKS
+                        rrdset_debug(st, "%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
+                                    rd->name
+                                  , (calculated_number)(next_store_ut - last_stored_ut)
+                        );
+                        #endif
+
+                        new_value = new_value * (calculated_number)(st->update_every * USEC_PER_SEC) / (calculated_number)(next_store_ut - last_stored_ut);
+                    }
+                    break;
+
+                case RRD_ALGORITHM_ABSOLUTE:
+                case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
+                case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
+                default:
+                    if(iterations == 1) {
+                        // this is the last iteration
+                        // do not interpolate
+                        // just show the calculated value
+
+                        new_value = rd->calculated_value;
+                    }
+                    else {
+                        // we have missed an update
+                        // interpolate in the middle values
+
+                        new_value = (calculated_number)
+                                (   (     (rd->calculated_value - rd->last_calculated_value)
+                                          * (calculated_number)(next_store_ut - last_collect_ut)
+                                          / (calculated_number)(now_collect_ut - last_collect_ut)
+                                    )
+                                    +  rd->last_calculated_value
+                                );
+
+                        #ifdef NETDATA_INTERNAL_CHECKS
+                        rrdset_debug(st, "%s: CALC2 DEF "
+                                    CALCULATED_NUMBER_FORMAT " = ((("
+                                            "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
+                                            " * %llu"
+                                            " / %llu) + " CALCULATED_NUMBER_FORMAT
+                                  , rd->name
+                                  , new_value
+                                  , rd->calculated_value, rd->last_calculated_value
+                                  , (next_store_ut - first_ut)
+                                  , (now_collect_ut - first_ut), rd->last_calculated_value
+                        );
+                        #endif
+                    }
+                    break;
+            }
+
+            if(unlikely(!store_this_entry)) {
+                rd->state->collect_ops.store_metric(rd, next_store_ut, SN_EMPTY_SLOT); //pack_storage_number(0, SN_NOT_EXISTS)
+//                rd->values[current_entry] = SN_EMPTY_SLOT; //pack_storage_number(0, SN_NOT_EXISTS);
+                continue;
+            }
+
+            if(likely(rd->updated && rd->collections_counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
+                rd->state->collect_ops.store_metric(rd, next_store_ut, pack_storage_number(new_value, storage_flags));
+//                rd->values[current_entry] = pack_storage_number(new_value, storage_flags );
+                rd->last_stored_value = new_value;
+
+                #ifdef NETDATA_INTERNAL_CHECKS
+                rrdset_debug(st, "%s: STORE[%ld] "
+                            CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
+                          , rd->name
+                          , current_entry
+                          , unpack_storage_number(rd->values[current_entry]), new_value
+                );
+                #endif
+
+            }
+            else {
+
+                #ifdef NETDATA_INTERNAL_CHECKS
+                rrdset_debug(st, "%s: STORE[%ld] = NON EXISTING "
+                          , rd->name
+                          , current_entry
+                );
+                #endif
+
+//                rd->values[current_entry] = SN_EMPTY_SLOT; // pack_storage_number(0, SN_NOT_EXISTS);
+                rd->state->collect_ops.store_metric(rd, next_store_ut, SN_EMPTY_SLOT); //pack_storage_number(0, SN_NOT_EXISTS)
+                rd->last_stored_value = NAN;
+            }
+
+            stored_entries++;
+
+            #ifdef NETDATA_INTERNAL_CHECKS
+            if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
+                calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
+                calculated_number t2 = unpack_storage_number(rd->values[current_entry]);
+
+                calculated_number accuracy = accuracy_loss(t1, t2);
+                debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
+                      , st->id, rd->name
+                      , current_entry
+                      , t2
+                      , get_storage_number_flags(rd->values[current_entry])
+                      , t1
+                      , accuracy
+                      , (accuracy > ACCURACY_LOSS_ACCEPTED_PERCENT) ? " **TOO BIG** " : ""
+                );
+
+                rd->collected_volume += t1;
+                rd->stored_volume += t2;
+
+                accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
+                debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
+                      , st->id, rd->name
+                      , current_entry
+                      , rd->stored_volume
+                      , rd->collected_volume
+                      , accuracy
+                      , (accuracy > ACCURACY_LOSS_ACCEPTED_PERCENT) ? " **TOO BIG** " : ""
+                );
+            }
+            #endif
+        }
+        // reset the storage flags for the next point, if any;
+        storage_flags = SN_EXISTS;
+
+        st->counter = ++counter;
+        st->current_entry = current_entry = ((current_entry + 1) >= st->entries) ? 0 : current_entry + 1;
+
+        st->last_updated.tv_sec = (time_t) (last_ut / USEC_PER_SEC);
+        st->last_updated.tv_usec = 0;
+
+        last_stored_ut = next_store_ut;
+    }
+
+/*
+    st->counter = counter;
+    st->current_entry = current_entry;
+
+    if(likely(last_ut)) {
+        st->last_updated.tv_sec = (time_t) (last_ut / USEC_PER_SEC);
+        st->last_updated.tv_usec = 0;
+    }
+*/
+
+    return stored_entries;
+}
+
+static inline void rrdset_done_fill_the_gap(RRDSET *st) {
+    usec_t update_every_ut = st->update_every * USEC_PER_SEC;
+    usec_t now_collect_ut  = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
+
+    long c = 0, entries = st->entries;
+    RRDDIM *rd;
+    rrddim_foreach_read(rd, st) {
+        usec_t next_store_ut = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
+        long current_entry = st->current_entry;
+
+        for(c = 0; c < entries && next_store_ut <= now_collect_ut ; next_store_ut += update_every_ut, c++) {
+            rd->values[current_entry] = SN_EMPTY_SLOT;
+            current_entry = ((current_entry + 1) >= entries) ? 0 : current_entry + 1;
+
+            #ifdef NETDATA_INTERNAL_CHECKS
+            rrdset_debug(st, "%s: STORE[%ld] = NON EXISTING (FILLED THE GAP)", rd->name, current_entry);
+            #endif
+        }
+    }
+
+    if(c > 0) {
+        c--;
+        st->last_updated.tv_sec += c * st->update_every;
+
+        st->current_entry += c;
+        if(st->current_entry >= st->entries)
+            st->current_entry -= st->entries;
+    }
+}
+
+void rrdset_done(RRDSET *st) {
+    if(unlikely(netdata_exit)) return;
+
+    debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
+
+    RRDDIM *rd;
+
+    char
+            store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
+            first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
+
+    usec_t
+            last_collect_ut = 0,    // the timestamp in microseconds, of the last collected value
+            now_collect_ut = 0,     // the timestamp in microseconds, of this collected value (this is NOW)
+            last_stored_ut = 0,     // the timestamp in microseconds, of the last stored entry in the db
+            next_store_ut = 0,      // the timestamp in microseconds, of the next entry to store in the db
+            update_every_ut = st->update_every * USEC_PER_SEC; // st->update_every in microseconds
+
+    netdata_thread_disable_cancelability();
+
+    // a read lock is OK here
+    rrdset_rdlock(st);
+
+#ifdef ENABLE_ACLK
+    if (unlikely(rrdset_flag_check(st, RRDSET_FLAG_ACLK))) {
+        rrdset_flag_clear(st, RRDSET_FLAG_ACLK);
+        aclk_update_chart(st->rrdhost, st->id, ACLK_CMD_CHART);
+    }
+#endif
+
+    if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE))) {
+        error("Chart '%s' has the OBSOLETE flag set, but it is collected.", st->id);
+        rrdset_isnot_obsolete(st);
+    }
+
+    // check if the chart has a long time to be updated
+    if(unlikely(st->usec_since_last_update > st->entries * update_every_ut &&
+                st->rrd_memory_mode != RRD_MEMORY_MODE_DBENGINE && st->rrd_memory_mode != RRD_MEMORY_MODE_NONE)) {
+        info("host '%s', chart %s: took too long to be updated (counter #%zu, update #%zu, %0.3" LONG_DOUBLE_MODIFIER " secs). Resetting it.", st->rrdhost->hostname, st->name, st->counter, st->counter_done, (LONG_DOUBLE)st->usec_since_last_update / USEC_PER_SEC);
+        rrdset_reset(st);
+        st->usec_since_last_update = update_every_ut;
+        store_this_entry = 0;
+        first_entry = 1;
+    }
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+    rrdset_debug(st, "microseconds since last update: %llu", st->usec_since_last_update);
+    #endif
+
+    // set last_collected_time
+    if(unlikely(!st->last_collected_time.tv_sec)) {
+        // it is the first entry
+        // set the last_collected_time to now
+        last_collect_ut = rrdset_init_last_collected_time(st) - update_every_ut;
+
+        // the first entry should not be stored
+        store_this_entry = 0;
+        first_entry = 1;
+    }
+    else {
+        // it is not the first entry
+        // calculate the proper last_collected_time, using usec_since_last_update
+        last_collect_ut = rrdset_update_last_collected_time(st);
+    }
+    if (unlikely(st->rrd_memory_mode == RRD_MEMORY_MODE_NONE)) {
+        goto after_first_database_work;
+    }
+
+    // if this set has not been updated in the past
+    // we fake the last_update time to be = now - usec_since_last_update
+    if(unlikely(!st->last_updated.tv_sec)) {
+        // it has never been updated before
+        // set a fake last_updated, in the past using usec_since_last_update
+        rrdset_init_last_updated_time(st);
+
+        // the first entry should not be stored
+        store_this_entry = 0;
+        first_entry = 1;
+    }
+
+    // check if we will re-write the entire data set
+    if(unlikely(dt_usec(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut &&
+                st->rrd_memory_mode != RRD_MEMORY_MODE_DBENGINE)) {
+        info("%s: too old data (last updated at %ld.%ld, last collected at %ld.%ld). Resetting it. Will not store the next entry.", st->name, st->last_updated.tv_sec, st->last_updated.tv_usec, st->last_collected_time.tv_sec, st->last_collected_time.tv_usec);
+        rrdset_reset(st);
+        rrdset_init_last_updated_time(st);
+
+        st->usec_since_last_update = update_every_ut;
+
+        // the first entry should not be stored
+        store_this_entry = 0;
+        first_entry = 1;
+    }
+
+#ifdef ENABLE_DBENGINE
+    // check if we will re-write the entire page
+    if(unlikely(st->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE &&
+                dt_usec(&st->last_collected_time, &st->last_updated) > (RRDENG_BLOCK_SIZE / sizeof(storage_number)) * update_every_ut)) {
+        info("%s: too old data (last updated at %ld.%ld, last collected at %ld.%ld). Resetting it. Will not store the next entry.", st->name, st->last_updated.tv_sec, st->last_updated.tv_usec, st->last_collected_time.tv_sec, st->last_collected_time.tv_usec);
+        rrdset_reset(st);
+        rrdset_init_last_updated_time(st);
+
+        st->usec_since_last_update = update_every_ut;
+
+        // the first entry should not be stored
+        store_this_entry = 0;
+        first_entry = 1;
+    }
+#endif
+
+    // these are the 3 variables that will help us in interpolation
+    // last_stored_ut = the last time we added a value to the storage
+    // now_collect_ut = the time the current value has been collected
+    // next_store_ut  = the time of the next interpolation point
+    now_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
+    last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
+    next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
+
+    if(unlikely(!st->counter_done)) {
+        // if we have not collected metrics this session (st->counter_done == 0)
+        // and we have collected metrics for this chart in the past (st->counter != 0)
+        // fill the gap (the chart has been just loaded from disk)
+        if(unlikely(st->counter) && st->rrd_memory_mode != RRD_MEMORY_MODE_DBENGINE) {
+            rrdset_done_fill_the_gap(st);
+            last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
+            next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
+        }
+        if (st->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE) {
+            // set a fake last_updated to jump to current time
+            rrdset_init_last_updated_time(st);
+            last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
+            next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
+        }
+
+        if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_STORE_FIRST))) {
+            store_this_entry = 1;
+            last_collect_ut = next_store_ut - update_every_ut;
+
+            #ifdef NETDATA_INTERNAL_CHECKS
+            rrdset_debug(st, "Fixed first entry.");
+            #endif
+        }
+        else {
+            store_this_entry = 0;
+
+            #ifdef NETDATA_INTERNAL_CHECKS
+            rrdset_debug(st, "Will not store the next entry.");
+            #endif
+        }
+    }
+after_first_database_work:
+    st->counter_done++;
+
+    if(unlikely(st->rrdhost->rrdpush_send_enabled))
+        rrdset_done_push(st);
+    if (unlikely(st->rrd_memory_mode == RRD_MEMORY_MODE_NONE)) {
+        goto after_second_database_work;
+    }
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+    rrdset_debug(st, "last_collect_ut = %0.3" LONG_DOUBLE_MODIFIER " (last collection time)", (LONG_DOUBLE)last_collect_ut/USEC_PER_SEC);
+    rrdset_debug(st, "now_collect_ut  = %0.3" LONG_DOUBLE_MODIFIER " (current collection time)", (LONG_DOUBLE)now_collect_ut/USEC_PER_SEC);
+    rrdset_debug(st, "last_stored_ut  = %0.3" LONG_DOUBLE_MODIFIER " (last updated time)", (LONG_DOUBLE)last_stored_ut/USEC_PER_SEC);
+    rrdset_debug(st, "next_store_ut   = %0.3" LONG_DOUBLE_MODIFIER " (next interpolation point)", (LONG_DOUBLE)next_store_ut/USEC_PER_SEC);
+    #endif
+
+    // calculate totals and count the dimensions
+    int dimensions = 0;
+    st->collected_total = 0;
+    rrddim_foreach_read(rd, st) {
+        if (rrddim_flag_check(rd, RRDDIM_FLAG_ARCHIVED))
+            continue;
+        dimensions++;
+        if(likely(rd->updated))
+            st->collected_total += rd->collected_value;
+    }
+
+    uint32_t storage_flags = SN_EXISTS;
+
+    // process all dimensions to calculate their values
+    // based on the collected figures only
+    // at this stage we do not interpolate anything
+    rrddim_foreach_read(rd, st) {
+        if (rrddim_flag_check(rd, RRDDIM_FLAG_ARCHIVED))
+            continue;
+
+        if(unlikely(!rd->updated)) {
+            rd->calculated_value = 0;
+            continue;
+        }
+
+        if(unlikely(rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE))) {
+            error("Dimension %s in chart '%s' has the OBSOLETE flag set, but it is collected.", rd->name, st->id);
+            rrddim_isnot_obsolete(st, rd);
+        }
+
+        #ifdef NETDATA_INTERNAL_CHECKS
+        rrdset_debug(st, "%s: START "
+                " last_collected_value = " COLLECTED_NUMBER_FORMAT
+                " collected_value = " COLLECTED_NUMBER_FORMAT
+                " last_calculated_value = " CALCULATED_NUMBER_FORMAT
+                " calculated_value = " CALCULATED_NUMBER_FORMAT
+                                      , rd->name
+                                      , rd->last_collected_value
+                                      , rd->collected_value
+                                      , rd->last_calculated_value
+                                      , rd->calculated_value
+        );
+        #endif
+
+        switch(rd->algorithm) {
+            case RRD_ALGORITHM_ABSOLUTE:
+                rd->calculated_value = (calculated_number)rd->collected_value
+                                       * (calculated_number)rd->multiplier
+                                       / (calculated_number)rd->divisor;
+
+                #ifdef NETDATA_INTERNAL_CHECKS
+                rrdset_debug(st, "%s: CALC ABS/ABS-NO-IN "
+                            CALCULATED_NUMBER_FORMAT " = "
+                            COLLECTED_NUMBER_FORMAT
+                            " * " CALCULATED_NUMBER_FORMAT
+                            " / " CALCULATED_NUMBER_FORMAT
+                          , rd->name
+                          , rd->calculated_value
+                          , rd->collected_value
+                          , (calculated_number)rd->multiplier
+                          , (calculated_number)rd->divisor
+                );
+                #endif
+
+                break;
+
+            case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
+                if(unlikely(!st->collected_total))
+                    rd->calculated_value = 0;
+                else
+                    // the percentage of the current value
+                    // over the total of all dimensions
+                    rd->calculated_value =
+                            (calculated_number)100
+                            * (calculated_number)rd->collected_value
+                            / (calculated_number)st->collected_total;
+
+                #ifdef NETDATA_INTERNAL_CHECKS
+                rrdset_debug(st, "%s: CALC PCENT-ROW "
+                            CALCULATED_NUMBER_FORMAT " = 100"
+                            " * " COLLECTED_NUMBER_FORMAT
+                            " / " COLLECTED_NUMBER_FORMAT
+                          , rd->name
+                          , rd->calculated_value
+                          , rd->collected_value
+                          , st->collected_total
+                );
+                #endif
+
+                break;
+
+            case RRD_ALGORITHM_INCREMENTAL:
+                if(unlikely(rd->collections_counter <= 1)) {
+                    rd->calculated_value = 0;
+                    continue;
+                }
+
+                // If the new is smaller than the old (an overflow, or reset), set the old equal to the new
+                // to reset the calculation (it will give zero as the calculation for this second).
+                // It is imperative to set the comparison to uint64_t since type collected_number is signed and
+                // produces wrong results as far as incremental counters are concerned.
+                if(unlikely((uint64_t)rd->last_collected_value > (uint64_t)rd->collected_value)) {
+                    debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
+                          , st->name, rd->name
+                          , rd->last_collected_value
+                          , rd->collected_value);
+
+                    if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
+                        storage_flags = SN_EXISTS_RESET;
+
+                    uint64_t last = (uint64_t)rd->last_collected_value;
+                    uint64_t new = (uint64_t)rd->collected_value;
+                    uint64_t max = (uint64_t)rd->collected_value_max;
+                    uint64_t cap = 0;
+
+                    // Signed values are handled by exploiting two's complement which will produce positive deltas
+                    if (max > 0x00000000FFFFFFFFULL)
+                        cap = 0xFFFFFFFFFFFFFFFFULL; // handles signed and unsigned 64-bit counters
+                    else
+                        cap = 0x00000000FFFFFFFFULL; // handles signed and unsigned 32-bit counters
+
+                    uint64_t delta = cap - last + new;
+                    uint64_t max_acceptable_rate = (cap / 100) * MAX_INCREMENTAL_PERCENT_RATE;
+
+                    // If the delta is less than the maximum acceptable rate and the previous value was near the cap
+                    // then this is an overflow. There can be false positives such that a reset is detected as an
+                    // overflow.
+                    // TODO: remember recent history of rates and compare with current rate to reduce this chance.
+                    if (delta < max_acceptable_rate) {
+                        rd->calculated_value +=
+                                (calculated_number) delta
+                                * (calculated_number) rd->multiplier
+                                / (calculated_number) rd->divisor;
+                    } else {
+                        // This is a reset. Any overflow with a rate greater than MAX_INCREMENTAL_PERCENT_RATE will also
+                        // be detected as a reset instead.
+                        rd->calculated_value += (calculated_number)0;
+                    }
+                }
+                else {
+                    rd->calculated_value +=
+                            (calculated_number) (rd->collected_value - rd->last_collected_value)
+                            * (calculated_number) rd->multiplier
+                            / (calculated_number) rd->divisor;
+                }
+
+                #ifdef NETDATA_INTERNAL_CHECKS
+                rrdset_debug(st, "%s: CALC INC PRE "
+                            CALCULATED_NUMBER_FORMAT " = ("
+                            COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
+                            ")"
+                                    " * " CALCULATED_NUMBER_FORMAT
+                            " / " CALCULATED_NUMBER_FORMAT
+                          , rd->name
+                          , rd->calculated_value
+                          , rd->collected_value, rd->last_collected_value
+                          , (calculated_number)rd->multiplier
+                          , (calculated_number)rd->divisor
+                );
+                #endif
+
+                break;
+
+            case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
+                if(unlikely(rd->collections_counter <= 1)) {
+                    rd->calculated_value = 0;
+                    continue;
+                }
+
+                // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
+                // to reset the calculation (it will give zero as the calculation for this second)
+                if(unlikely(rd->last_collected_value > rd->collected_value)) {
+                    debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
+                          , st->name, rd->name
+                          , rd->last_collected_value
+                          , rd->collected_value
+                    );
+
+                    if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
+                        storage_flags = SN_EXISTS_RESET;
+
+                    rd->last_collected_value = rd->collected_value;
+                }
+
+                // the percentage of the current increment
+                // over the increment of all dimensions together
+                if(unlikely(st->collected_total == st->last_collected_total))
+                    rd->calculated_value = 0;
+                else
+                    rd->calculated_value =
+                            (calculated_number)100
+                            * (calculated_number)(rd->collected_value - rd->last_collected_value)
+                            / (calculated_number)(st->collected_total - st->last_collected_total);
+
+                #ifdef NETDATA_INTERNAL_CHECKS
+                rrdset_debug(st, "%s: CALC PCENT-DIFF "
+                            CALCULATED_NUMBER_FORMAT " = 100"
+                            " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
+                            " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
+                          , rd->name
+                          , rd->calculated_value
+                          , rd->collected_value, rd->last_collected_value
+                          , st->collected_total, st->last_collected_total
+                );
+                #endif
+
+                break;
+
+            default:
+                // make the default zero, to make sure
+                // it gets noticed when we add new types
+                rd->calculated_value = 0;
+
+                #ifdef NETDATA_INTERNAL_CHECKS
+                rrdset_debug(st, "%s: CALC "
+                            CALCULATED_NUMBER_FORMAT " = 0"
+                          , rd->name
+                          , rd->calculated_value
+                );
+                #endif
+
+                break;
+        }
+
+        #ifdef NETDATA_INTERNAL_CHECKS
+        rrdset_debug(st, "%s: PHASE2 "
+                    " last_collected_value = " COLLECTED_NUMBER_FORMAT
+                    " collected_value = " COLLECTED_NUMBER_FORMAT
+                    " last_calculated_value = " CALCULATED_NUMBER_FORMAT
+                    " calculated_value = " CALCULATED_NUMBER_FORMAT
+                                      , rd->name
+                                      , rd->last_collected_value
+                                      , rd->collected_value
+                                      , rd->last_calculated_value
+                                      , rd->calculated_value
+        );
+        #endif
+
+    }
+
+    // at this point we have all the calculated values ready
+    // it is now time to interpolate values on a second boundary
+
+#ifdef NETDATA_INTERNAL_CHECKS
+    if(unlikely(now_collect_ut < next_store_ut)) {
+        // this is collected in the same interpolation point
+        rrdset_debug(st, "THIS IS IN THE SAME INTERPOLATION POINT");
+        info("INTERNAL CHECK: host '%s', chart '%s' is collected in the same interpolation point: short by %llu microseconds", st->rrdhost->hostname, st->name, next_store_ut - now_collect_ut);
+    }
+#endif
+
+    rrdset_done_interpolate(st
+            , update_every_ut
+            , last_stored_ut
+            , next_store_ut
+            , last_collect_ut
+            , now_collect_ut
+            , store_this_entry
+            , storage_flags
+    );
+
+after_second_database_work:
+    st->last_collected_total  = st->collected_total;
+
+    rrddim_foreach_read(rd, st) {
+        if (rrddim_flag_check(rd, RRDDIM_FLAG_ARCHIVED))
+            continue;
+        if(unlikely(!rd->updated))
+            continue;
+
+        #ifdef NETDATA_INTERNAL_CHECKS
+        rrdset_debug(st, "%s: setting last_collected_value (old: " COLLECTED_NUMBER_FORMAT ") to last_collected_value (new: " COLLECTED_NUMBER_FORMAT ")", rd->name, rd->last_collected_value, rd->collected_value);
+        #endif
+
+        rd->last_collected_value = rd->collected_value;
+
+        switch(rd->algorithm) {
+            case RRD_ALGORITHM_INCREMENTAL:
+                if(unlikely(!first_entry)) {
+                    #ifdef NETDATA_INTERNAL_CHECKS
+                    rrdset_debug(st, "%s: setting last_calculated_value (old: " CALCULATED_NUMBER_FORMAT ") to last_calculated_value (new: " CALCULATED_NUMBER_FORMAT ")", rd->name, rd->last_calculated_value + rd->calculated_value, rd->calculated_value);
+                    #endif
+
+                    rd->last_calculated_value += rd->calculated_value;
+                }
+                else {
+                    #ifdef NETDATA_INTERNAL_CHECKS
+                    rrdset_debug(st, "THIS IS THE FIRST POINT");
+                    #endif
+                }
+                break;
+
+            case RRD_ALGORITHM_ABSOLUTE:
+            case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
+            case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
+                #ifdef NETDATA_INTERNAL_CHECKS
+                rrdset_debug(st, "%s: setting last_calculated_value (old: " CALCULATED_NUMBER_FORMAT ") to last_calculated_value (new: " CALCULATED_NUMBER_FORMAT ")", rd->name, rd->last_calculated_value, rd->calculated_value);
+                #endif
+
+                rd->last_calculated_value = rd->calculated_value;
+                break;
+        }
+
+        rd->calculated_value = 0;
+        rd->collected_value = 0;
+        rd->updated = 0;
+
+        #ifdef NETDATA_INTERNAL_CHECKS
+        rrdset_debug(st, "%s: END "
+                    " last_collected_value = " COLLECTED_NUMBER_FORMAT
+                    " collected_value = " COLLECTED_NUMBER_FORMAT
+                    " last_calculated_value = " CALCULATED_NUMBER_FORMAT
+                    " calculated_value = " CALCULATED_NUMBER_FORMAT
+                                      , rd->name
+                                      , rd->last_collected_value
+                                      , rd->collected_value
+                                      , rd->last_calculated_value
+                                      , rd->calculated_value
+        );
+        #endif
+
+    }
+
+    // ALL DONE ABOUT THE DATA UPDATE
+    // --------------------------------------------------------------------
+
+    // find if there are any obsolete dimensions
+    time_t now = now_realtime_sec();
+
+    if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE_DIMENSIONS))) {
+        rrddim_foreach_read(rd, st)
+            if(unlikely(rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE)))
+                break;
+
+        if(unlikely(rd)) {
+            RRDDIM *last;
+            // there is a dimension to free
+            // upgrade our read lock to a write lock
+            rrdset_unlock(st);
+            rrdset_wrlock(st);
+
+            for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
+                if(unlikely(rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE) && (rd->last_collected_time.tv_sec + rrdset_free_obsolete_time < now))) {
+                    info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
+
+                    if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || rd->rrd_memory_mode == RRD_MEMORY_MODE_MAP)) {
+                        info("Deleting dimension file '%s'.", rd->cache_filename);
+                        if(unlikely(unlink(rd->cache_filename) == -1))
+                            error("Cannot delete dimension file '%s'", rd->cache_filename);
+                    }
+
+#ifdef ENABLE_DBENGINE
+                    if (rd->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE) {
+                        rrddim_flag_set(rd, RRDDIM_FLAG_ARCHIVED);
+                        while(rd->variables)
+                            rrddimvar_free(rd->variables);
+
+                        rrddim_flag_clear(rd, RRDDIM_FLAG_OBSOLETE);
+                        /* only a collector can mark a chart as obsolete, so we must remove the reference */
+                        uint8_t can_delete_metric = rd->state->collect_ops.finalize(rd);
+                        if (can_delete_metric) {
+                            /* This metric has no data and no references */
+                            delete_dimension_uuid(rd->state->metric_uuid);
+                        } else {
+                            /* Do not delete this dimension */
+                            last = rd;
+                            rd = rd->next;
+                            continue;
+                        }
+                    }
+#endif
+                    if(unlikely(!last)) {
+                        rrddim_free(st, rd);
+                        rd = st->dimensions;
+                        continue;
+                    }
+                    else {
+                        rrddim_free(st, rd);
+                        rd = last->next;
+                        continue;
+                    }
+                }
+
+                last = rd;
+                rd = rd->next;
+            }
+        }
+        else {
+            rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE_DIMENSIONS);
+        }
+    }
+
+    rrdset_unlock(st);
+
+    netdata_thread_enable_cancelability();
+}
+
+void rrdset_add_label_to_new_list(RRDSET *st, char *key, char *value, LABEL_SOURCE source)
+{
+    st->state->new_labels = add_label_to_list(st->state->new_labels, key, value, source);
+}
+
+void rrdset_finalize_labels(RRDSET *st)
+{
+    struct label *new_labels = st->state->new_labels;
+    struct label_index *labels = &st->state->labels;
+
+    if (!labels->head) {
+        labels->head = new_labels;
+    } else {
+        replace_label_list(labels, new_labels);
+    }
+    st->state->new_labels = NULL;
+}
+
+void rrdset_update_labels(RRDSET *st, struct label *labels)
+{
+    if (!labels)
+        return;
+
+    update_label_list(&st->state->new_labels, labels);
+    rrdset_finalize_labels(st);
+}
+
+int rrdset_contains_label_keylist(RRDSET *st, char *keylist)
+{
+    struct label_index *labels = &st->state->labels;
+    int ret;
+
+    if (!labels->head)
+        return 0;
+
+    netdata_rwlock_rdlock(&labels->labels_rwlock);
+    ret = label_list_contains_keylist(labels->head, keylist);
+    netdata_rwlock_unlock(&labels->labels_rwlock);
+
+    return ret;
+}
+
+struct label *rrdset_lookup_label_key(RRDSET *st, char *key, uint32_t key_hash)
+{
+    struct label_index *labels = &st->state->labels;
+    struct label *ret = NULL;
+
+    if (labels->head) {
+        netdata_rwlock_rdlock(&labels->labels_rwlock);
+        ret = label_list_lookup_key(labels->head, key, key_hash);
+        netdata_rwlock_unlock(&labels->labels_rwlock);
+    }
+    return ret;
+}