Merging upstream version 1.45.3+dfsg.

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

1 files changed, 0 insertions, 2361 deletions

diff --git a/database/rrdset.c b/database/rrdset.c
deleted file mode 100644
index f4bb48aa7..000000000
--- a/database/rrdset.c
+++ /dev/null
@@ -1,2361 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#define NETDATA_RRD_INTERNALS
-#include "rrd.h"
-#include <sched.h>
-#include "storage_engine.h"
-
-
-void rrdset_metadata_updated(RRDSET *st) {
-    __atomic_add_fetch(&st->version, 1, __ATOMIC_RELAXED);
-    rrdcontext_updated_rrdset(st);
-}
-
-// ----------------------------------------------------------------------------
-// RRDSET rrdpush send chart_slots
-
-static void rrdset_rrdpush_send_chart_slot_assign(RRDSET *st) {
-    RRDHOST *host = st->rrdhost;
-    spinlock_lock(&host->rrdpush.send.pluginsd_chart_slots.available.spinlock);
-
-    if(host->rrdpush.send.pluginsd_chart_slots.available.used > 0)
-        st->rrdpush.sender.chart_slot =
-                host->rrdpush.send.pluginsd_chart_slots.available.array[--host->rrdpush.send.pluginsd_chart_slots.available.used];
-    else
-        st->rrdpush.sender.chart_slot = ++host->rrdpush.send.pluginsd_chart_slots.last_used;
-
-    spinlock_unlock(&host->rrdpush.send.pluginsd_chart_slots.available.spinlock);
-}
-
-static void rrdset_rrdpush_send_chart_slot_release(RRDSET *st) {
-    if(!st->rrdpush.sender.chart_slot || st->rrdhost->rrdpush.send.pluginsd_chart_slots.available.ignore)
-        return;
-
-    RRDHOST *host = st->rrdhost;
-    spinlock_lock(&host->rrdpush.send.pluginsd_chart_slots.available.spinlock);
-
-    if(host->rrdpush.send.pluginsd_chart_slots.available.used >= host->rrdpush.send.pluginsd_chart_slots.available.size) {
-        uint32_t old_size = host->rrdpush.send.pluginsd_chart_slots.available.size;
-        uint32_t new_size = (old_size > 0) ? (old_size * 2) : 1024;
-
-        host->rrdpush.send.pluginsd_chart_slots.available.array =
-                reallocz(host->rrdpush.send.pluginsd_chart_slots.available.array, new_size * sizeof(uint32_t));
-
-        host->rrdpush.send.pluginsd_chart_slots.available.size = new_size;
-    }
-
-    host->rrdpush.send.pluginsd_chart_slots.available.array[host->rrdpush.send.pluginsd_chart_slots.available.used++] =
-            st->rrdpush.sender.chart_slot;
-
-    st->rrdpush.sender.chart_slot = 0;
-    spinlock_unlock(&host->rrdpush.send.pluginsd_chart_slots.available.spinlock);
-}
-
-void rrdhost_pluginsd_send_chart_slots_free(RRDHOST *host) {
-    spinlock_lock(&host->rrdpush.send.pluginsd_chart_slots.available.spinlock);
-    host->rrdpush.send.pluginsd_chart_slots.available.ignore = true;
-    freez(host->rrdpush.send.pluginsd_chart_slots.available.array);
-    host->rrdpush.send.pluginsd_chart_slots.available.array = NULL;
-    host->rrdpush.send.pluginsd_chart_slots.available.used = 0;
-    host->rrdpush.send.pluginsd_chart_slots.available.size = 0;
-    spinlock_unlock(&host->rrdpush.send.pluginsd_chart_slots.available.spinlock);
-
-    // zero all the slots on all charts, so that they will not attempt to access the array
-    RRDSET *st;
-    rrdset_foreach_read(st, host) {
-        st->rrdpush.sender.chart_slot = 0;
-    }
-    rrdset_foreach_done(st);
-}
-
-void rrdset_pluginsd_receive_unslot(RRDSET *st) {
-    for(size_t i = 0; i < st->pluginsd.size ;i++) {
-        rrddim_acquired_release(st->pluginsd.prd_array[i].rda); // can be NULL
-        st->pluginsd.prd_array[i].rda = NULL;
-        st->pluginsd.prd_array[i].rd = NULL;
-        st->pluginsd.prd_array[i].id = NULL;
-    }
-
-    RRDHOST *host = st->rrdhost;
-
-    if(st->pluginsd.last_slot >= 0 &&
-        (uint32_t)st->pluginsd.last_slot < host->rrdpush.receive.pluginsd_chart_slots.size &&
-        host->rrdpush.receive.pluginsd_chart_slots.array[st->pluginsd.last_slot] == st) {
-        host->rrdpush.receive.pluginsd_chart_slots.array[st->pluginsd.last_slot] = NULL;
-    }
-
-    st->pluginsd.last_slot = -1;
-    st->pluginsd.dims_with_slots = false;
-}
-
-void rrdset_pluginsd_receive_unslot_and_cleanup(RRDSET *st) {
-    if(!st)
-        return;
-
-    spinlock_lock(&st->pluginsd.spinlock);
-
-    rrdset_pluginsd_receive_unslot(st);
-
-    freez(st->pluginsd.prd_array);
-    st->pluginsd.prd_array = NULL;
-    st->pluginsd.size = 0;
-    st->pluginsd.pos = 0;
-    st->pluginsd.set = false;
-    st->pluginsd.last_slot = -1;
-    st->pluginsd.dims_with_slots = false;
-    st->pluginsd.collector_tid = 0;
-
-    spinlock_unlock(&st->pluginsd.spinlock);
-}
-
-static void rrdset_pluginsd_receive_slots_initialize(RRDSET *st) {
-    spinlock_init(&st->pluginsd.spinlock);
-    st->pluginsd.last_slot = -1;
-}
-
-void rrdhost_pluginsd_receive_chart_slots_free(RRDHOST *host) {
-    spinlock_lock(&host->rrdpush.receive.pluginsd_chart_slots.spinlock);
-
-    if(host->rrdpush.receive.pluginsd_chart_slots.array) {
-        for (size_t s = 0; s < host->rrdpush.receive.pluginsd_chart_slots.size; s++)
-            rrdset_pluginsd_receive_unslot_and_cleanup(host->rrdpush.receive.pluginsd_chart_slots.array[s]);
-
-        freez(host->rrdpush.receive.pluginsd_chart_slots.array);
-        host->rrdpush.receive.pluginsd_chart_slots.array = NULL;
-        host->rrdpush.receive.pluginsd_chart_slots.size = 0;
-    }
-
-    spinlock_unlock(&host->rrdpush.receive.pluginsd_chart_slots.spinlock);
-}
-
-// ----------------------------------------------------------------------------
-// RRDSET name index
-
-static void rrdset_name_insert_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdset, void *rrdhost __maybe_unused) {
-    RRDSET *st = rrdset;
-    rrdset_flag_set(st, RRDSET_FLAG_INDEXED_NAME);
-}
-static void rrdset_name_delete_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdset, void *rrdhost __maybe_unused) {
-    RRDSET *st = rrdset;
-    rrdset_flag_clear(st, RRDSET_FLAG_INDEXED_NAME);
-}
-
-static inline void rrdset_index_add_name(RRDHOST *host, RRDSET *st) {
-    if(!st->name) return;
-    dictionary_set(host->rrdset_root_index_name, rrdset_name(st), st, sizeof(RRDSET));
-}
-
-static inline void rrdset_index_del_name(RRDHOST *host, RRDSET *st) {
-    if(rrdset_flag_check(st, RRDSET_FLAG_INDEXED_NAME))
-        dictionary_del(host->rrdset_root_index_name, rrdset_name(st));
-}
-
-static inline RRDSET *rrdset_index_find_name(RRDHOST *host, const char *name) {
-    if (unlikely(!host->rrdset_root_index_name))
-        return NULL;
-    return dictionary_get(host->rrdset_root_index_name, name);
-}
-
-// ----------------------------------------------------------------------------
-// RRDSET index
-
-static inline void rrdset_update_permanent_labels(RRDSET *st) {
-    if(!st->rrdlabels) return;
-
-    rrdlabels_add(st->rrdlabels, "_collect_plugin", rrdset_plugin_name(st), RRDLABEL_SRC_AUTO | RRDLABEL_FLAG_DONT_DELETE);
-    rrdlabels_add(st->rrdlabels, "_collect_module", rrdset_module_name(st), RRDLABEL_SRC_AUTO | RRDLABEL_FLAG_DONT_DELETE);
-}
-
-static STRING *rrdset_fix_name(RRDHOST *host, const char *chart_full_id, const char *type, const char *current_name, const char *name) {
-    if(!name || !*name) return NULL;
-
-    char full_name[RRD_ID_LENGTH_MAX + 1];
-    char sanitized_name[CONFIG_MAX_VALUE + 1];
-    char new_name[CONFIG_MAX_VALUE + 1];
-
-    snprintfz(full_name, RRD_ID_LENGTH_MAX, "%s.%s", type, name);
-    rrdset_strncpyz_name(sanitized_name, full_name, CONFIG_MAX_VALUE);
-    strncpyz(new_name, sanitized_name, CONFIG_MAX_VALUE);
-
-    if(rrdset_index_find_name(host, new_name)) {
-        netdata_log_debug(D_RRD_CALLS, "RRDSET: chart name '%s' on host '%s' already exists.", new_name, rrdhost_hostname(host));
-        if(!strcmp(chart_full_id, full_name) && (!current_name || !*current_name)) {
-            unsigned i = 1;
-
-            do {
-                snprintfz(new_name, CONFIG_MAX_VALUE, "%s_%u", sanitized_name, i);
-                i++;
-            } while (rrdset_index_find_name(host, new_name));
-
-//            netdata_log_info("RRDSET: using name '%s' for chart '%s' on host '%s'.", new_name, full_name, rrdhost_hostname(host));
-        }
-        else
-            return NULL;
-    }
-
-    return string_strdupz(new_name);
-}
-
-struct rrdset_constructor {
-    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;
-
-    enum {
-        RRDSET_REACT_NONE                   = 0,
-        RRDSET_REACT_NEW                    = (1 << 0),
-        RRDSET_REACT_UPDATED                = (1 << 1),
-        RRDSET_REACT_PLUGIN_UPDATED         = (1 << 2),
-        RRDSET_REACT_MODULE_UPDATED         = (1 << 3),
-        RRDSET_REACT_CHART_ACTIVATED        = (1 << 4),
-    } react_action;
-};
-
-// the constructor - the dictionary is write locked while this runs
-static void rrdset_insert_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdset, void *constructor_data) {
-    struct rrdset_constructor *ctr = constructor_data;
-    RRDHOST *host = ctr->host;
-    RRDSET *st = rrdset;
-
-    const char *chart_full_id = dictionary_acquired_item_name(item);
-
-    st->id = string_strdupz(chart_full_id);
-
-    st->name = rrdset_fix_name(host, chart_full_id, ctr->type, NULL, ctr->name);
-    if(!st->name)
-        st->name = rrdset_fix_name(host, chart_full_id, ctr->type, NULL, ctr->id);
-    rrdset_index_add_name(host, st);
-
-    st->parts.id = string_strdupz(ctr->id);
-    st->parts.type = string_strdupz(ctr->type);
-    st->parts.name = string_strdupz(ctr->name);
-
-    st->family = (ctr->family && *ctr->family) ? rrd_string_strdupz(ctr->family) : rrd_string_strdupz(ctr->type);
-    st->context = (ctr->context && *ctr->context) ? rrd_string_strdupz(ctr->context) : rrd_string_strdupz(chart_full_id);
-
-    st->units = rrd_string_strdupz(ctr->units);
-    st->title = rrd_string_strdupz(ctr->title);
-    st->plugin_name = rrd_string_strdupz(ctr->plugin);
-    st->module_name = rrd_string_strdupz(ctr->module);
-    st->priority = ctr->priority;
-
-    st->db.entries = (ctr->memory_mode != RRD_MEMORY_MODE_DBENGINE) ? align_entries_to_pagesize(ctr->memory_mode, ctr->history_entries) : 5;
-    st->update_every = ctr->update_every;
-    st->rrd_memory_mode = ctr->memory_mode;
-
-    st->chart_type = ctr->chart_type;
-    st->rrdhost = host;
-
-    rrdset_rrdpush_send_chart_slot_assign(st);
-
-    spinlock_init(&st->data_collection_lock);
-
-    st->flags =   RRDSET_FLAG_SYNC_CLOCK
-                | RRDSET_FLAG_INDEXED_ID
-                | RRDSET_FLAG_RECEIVER_REPLICATION_FINISHED
-                | RRDSET_FLAG_SENDER_REPLICATION_FINISHED
-                ;
-
-    rw_spinlock_init(&st->alerts.spinlock);
-
-    if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || st->rrd_memory_mode == RRD_MEMORY_MODE_MAP) {
-        if(!rrdset_memory_load_or_create_map_save(st, st->rrd_memory_mode)) {
-            netdata_log_info("Failed to use db mode %s for chart '%s', falling back to ram mode.", (st->rrd_memory_mode == RRD_MEMORY_MODE_MAP)?"map":"save", rrdset_name(st));
-            st->rrd_memory_mode = RRD_MEMORY_MODE_RAM;
-        }
-    }
-
-    // initialize the db tiers
-    {
-        for(size_t tier = 0; tier < storage_tiers ; tier++) {
-            STORAGE_ENGINE *eng = st->rrdhost->db[tier].eng;
-            if(!eng) continue;
-
-            st->storage_metrics_groups[tier] = storage_engine_metrics_group_get(eng->backend, host->db[tier].instance, &st->chart_uuid);
-        }
-    }
-
-    rrddim_index_init(st);
-
-    // chart variables - we need this for data collection to work (collector given chart variables) - not only health
-    rrdsetvar_index_init(st);
-
-    if (host->health.health_enabled) {
-        st->rrdfamily = rrdfamily_add_and_acquire(host, rrdset_family(st));
-        st->rrdvars = rrdvariables_create();
-        rrddimvar_index_init(st);
-    }
-
-    st->rrdlabels = rrdlabels_create();
-    rrdset_update_permanent_labels(st);
-
-    st->green = NAN;
-    st->red = NAN;
-
-    rrdset_pluginsd_receive_slots_initialize(st);
-
-    ctr->react_action = RRDSET_REACT_NEW;
-
-    ml_chart_new(st);
-}
-
-void rrdset_finalize_collection(RRDSET *st, bool dimensions_too) {
-    RRDHOST *host = st->rrdhost;
-
-    rrdset_flag_set(st, RRDSET_FLAG_COLLECTION_FINISHED);
-
-    if(dimensions_too) {
-        RRDDIM *rd;
-        rrddim_foreach_read(rd, st)
-            rrddim_finalize_collection_and_check_retention(rd);
-        rrddim_foreach_done(rd);
-    }
-
-    for(size_t tier = 0; tier < storage_tiers ; tier++) {
-        STORAGE_ENGINE *eng = st->rrdhost->db[tier].eng;
-        if(!eng) continue;
-
-        if(st->storage_metrics_groups[tier]) {
-            storage_engine_metrics_group_release(eng->backend, host->db[tier].instance, st->storage_metrics_groups[tier]);
-            st->storage_metrics_groups[tier] = NULL;
-        }
-    }
-
-    rrdset_pluginsd_receive_unslot_and_cleanup(st);
-}
-
-// the destructor - the dictionary is write locked while this runs
-static void rrdset_delete_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdset, void *rrdhost) {
-    RRDHOST *host = rrdhost;
-    RRDSET *st = rrdset;
-
-    rrdset_flag_clear(st, RRDSET_FLAG_INDEXED_ID);
-
-    rrdset_finalize_collection(st, false);
-
-    rrdset_rrdpush_send_chart_slot_release(st);
-
-    // remove it from the name index
-    rrdset_index_del_name(host, st);
-
-    // release the collector info
-    dictionary_destroy(st->functions_view);
-
-    rrdcalc_unlink_all_rrdset_alerts(st);
-
-    // ------------------------------------------------------------------------
-    // the order of destruction is important here
-
-    // 1. delete RRDDIMVAR index - this will speed up the destruction of RRDDIMs
-    //    because each dimension loops to find its own variables in this index.
-    //    There are no references to the items on this index from the dimensions.
-    //    To find their own, they have to walk-through the dictionary.
-    rrddimvar_index_destroy(st);                // destroy the rrddimvar index
-
-    // 2. delete RRDSETVAR index
-    rrdsetvar_index_destroy(st);                // destroy the rrdsetvar index
-
-    // 3. delete RRDVAR index after the above, to avoid triggering its garbage collector (they have references on this)
-    rrdvariables_destroy(st->rrdvars);      // free all variables and destroy the rrdvar dictionary
-
-    // 4. delete RRDFAMILY - this has to be last, because RRDDIMVAR and RRDSETVAR need the reference counter
-    rrdfamily_release(host, st->rrdfamily); // release the acquired rrdfamily -- has to be after all variables
-
-    // 5. delete RRDDIMs, now their variables are not existing, so this is fast
-    rrddim_index_destroy(st);                   // free all the dimensions and destroy the dimensions index
-
-    // 6. this has to be after the dimensions are freed, but before labels are freed (contexts need the labels)
-    rrdcontext_removed_rrdset(st);              // let contexts know
-
-    // 7. destroy the chart labels
-    rrdlabels_destroy(st->rrdlabels);  // destroy the labels, after letting the contexts know
-
-    // 8. destroy the ml handle
-    ml_chart_delete(st);
-
-    rrdset_memory_file_free(st);                // remove files of db mode save and map
-
-    // ------------------------------------------------------------------------
-    // free it
-
-    string_freez(st->id);
-    string_freez(st->name);
-    string_freez(st->parts.id);
-    string_freez(st->parts.type);
-    string_freez(st->parts.name);
-    string_freez(st->family);
-    string_freez(st->title);
-    string_freez(st->units);
-    string_freez(st->context);
-    string_freez(st->plugin_name);
-    string_freez(st->module_name);
-
-    freez(st->exporting_flags);
-    freez(st->db.cache_dir);
-}
-
-// the item to be inserted, is already in the dictionary
-// this callback deals with the situation, migrating the existing object to the new values
-// the dictionary is write locked while this runs
-static bool rrdset_conflict_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdset, void *new_rrdset, void *constructor_data) {
-    (void)new_rrdset; // it is NULL
-
-    struct rrdset_constructor *ctr = constructor_data;
-    RRDSET *st = rrdset;
-
-    rrdset_isnot_obsolete___safe_from_collector_thread(st);
-
-    ctr->react_action = RRDSET_REACT_NONE;
-
-    if (rrdset_reset_name(st, (ctr->name && *ctr->name) ? ctr->name : ctr->id) == 2)
-        ctr->react_action |= RRDSET_REACT_UPDATED;
-
-    if (unlikely(st->priority != ctr->priority)) {
-        st->priority = ctr->priority;
-        ctr->react_action |= RRDSET_REACT_UPDATED;
-    }
-
-    if (unlikely(st->update_every != ctr->update_every)) {
-        rrdset_set_update_every_s(st, ctr->update_every);
-        ctr->react_action |= RRDSET_REACT_UPDATED;
-    }
-
-    if(ctr->plugin && *ctr->plugin) {
-        STRING *old_plugin = st->plugin_name;
-        st->plugin_name = rrd_string_strdupz(ctr->plugin);
-        if (old_plugin != st->plugin_name)
-            ctr->react_action |= RRDSET_REACT_PLUGIN_UPDATED;
-        string_freez(old_plugin);
-    }
-
-    if(ctr->module && *ctr->module) {
-        STRING *old_module = st->module_name;
-        st->module_name = rrd_string_strdupz(ctr->module);
-        if (old_module != st->module_name)
-            ctr->react_action |= RRDSET_REACT_MODULE_UPDATED;
-        string_freez(old_module);
-    }
-
-    if(ctr->title && *ctr->title) {
-        STRING *old_title = st->title;
-        st->title = rrd_string_strdupz(ctr->title);
-        if(old_title != st->title)
-            ctr->react_action |= RRDSET_REACT_UPDATED;
-        string_freez(old_title);
-    }
-
-    if(ctr->units && *ctr->units) {
-        STRING *old_units = st->units;
-        st->units = rrd_string_strdupz(ctr->units);
-        if(old_units != st->units)
-            ctr->react_action |= RRDSET_REACT_UPDATED;
-        string_freez(old_units);
-    }
-
-    if(ctr->family && *ctr->family) {
-        STRING *old_family = st->family;
-        st->family = rrd_string_strdupz(ctr->family);
-        if(old_family != st->family)
-            ctr->react_action |= RRDSET_REACT_UPDATED;
-        string_freez(old_family);
-
-        // TODO - we should rename RRDFAMILY variables
-    }
-
-    if(ctr->context && *ctr->context) {
-        STRING *old_context = st->context;
-        st->context = rrd_string_strdupz(ctr->context);
-        if(old_context != st->context)
-            ctr->react_action |= RRDSET_REACT_UPDATED;
-        string_freez(old_context);
-    }
-
-    if(st->chart_type != ctr->chart_type) {
-        st->chart_type = ctr->chart_type;
-        ctr->react_action |= RRDSET_REACT_UPDATED;
-    }
-
-    rrdset_update_permanent_labels(st);
-
-    rrdset_flag_set(st, RRDSET_FLAG_SYNC_CLOCK);
-
-    return ctr->react_action != RRDSET_REACT_NONE;
-}
-
-// this is called after all insertions/conflicts, with the dictionary unlocked, with a reference to RRDSET
-// so, any actions requiring locks on other objects, should be placed here
-static void rrdset_react_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdset, void *constructor_data) {
-    struct rrdset_constructor *ctr = constructor_data;
-    RRDSET *st = rrdset;
-    RRDHOST *host = st->rrdhost;
-
-    st->last_accessed_time_s = now_realtime_sec();
-
-    if(host->health.health_enabled && (ctr->react_action & (RRDSET_REACT_NEW | RRDSET_REACT_CHART_ACTIVATED))) {
-        rrdset_flag_set(st, RRDSET_FLAG_PENDING_HEALTH_INITIALIZATION);
-        rrdhost_flag_set(st->rrdhost, RRDHOST_FLAG_PENDING_HEALTH_INITIALIZATION);
-    }
-
-    if(ctr->react_action & (RRDSET_REACT_NEW | RRDSET_REACT_PLUGIN_UPDATED | RRDSET_REACT_MODULE_UPDATED)) {
-        if (ctr->react_action & RRDSET_REACT_NEW) {
-            if(unlikely(rrdcontext_find_chart_uuid(st,  &st->chart_uuid)))
-                uuid_generate(st->chart_uuid);
-        }
-        rrdset_flag_set(st, RRDSET_FLAG_METADATA_UPDATE);
-        rrdhost_flag_set(st->rrdhost, RRDHOST_FLAG_METADATA_UPDATE);
-    }
-
-    rrdset_metadata_updated(st);
-}
-
-void rrdset_index_init(RRDHOST *host) {
-    if(!host->rrdset_root_index) {
-        host->rrdset_root_index = dictionary_create_advanced(DICT_OPTION_DONT_OVERWRITE_VALUE | DICT_OPTION_FIXED_SIZE,
-                                                             &dictionary_stats_category_rrdset_rrddim, sizeof(RRDSET));
-
-        dictionary_register_insert_callback(host->rrdset_root_index, rrdset_insert_callback, NULL);
-        dictionary_register_conflict_callback(host->rrdset_root_index, rrdset_conflict_callback, NULL);
-        dictionary_register_react_callback(host->rrdset_root_index, rrdset_react_callback, NULL);
-        dictionary_register_delete_callback(host->rrdset_root_index, rrdset_delete_callback, host);
-    }
-
-    if(!host->rrdset_root_index_name) {
-        host->rrdset_root_index_name = dictionary_create_advanced(
-            DICT_OPTION_NAME_LINK_DONT_CLONE | DICT_OPTION_VALUE_LINK_DONT_CLONE | DICT_OPTION_DONT_OVERWRITE_VALUE,
-            &dictionary_stats_category_rrdset_rrddim, 0);
-
-        dictionary_register_insert_callback(host->rrdset_root_index_name, rrdset_name_insert_callback, host);
-        dictionary_register_delete_callback(host->rrdset_root_index_name, rrdset_name_delete_callback, host);
-    }
-}
-
-void rrdset_index_destroy(RRDHOST *host) {
-    // destroy the name index first
-    dictionary_destroy(host->rrdset_root_index_name);
-    host->rrdset_root_index_name = NULL;
-
-    // destroy the id index last
-    dictionary_destroy(host->rrdset_root_index);
-    host->rrdset_root_index = NULL;
-}
-
-static inline RRDSET *rrdset_index_add(RRDHOST *host, const char *id, struct rrdset_constructor *st_ctr) {
-    return dictionary_set_advanced(host->rrdset_root_index, id, -1, NULL, sizeof(RRDSET), st_ctr);
-}
-
-static inline void rrdset_index_del(RRDHOST *host, RRDSET *st) {
-    if(rrdset_flag_check(st, RRDSET_FLAG_INDEXED_ID))
-        dictionary_del(host->rrdset_root_index, rrdset_id(st));
-}
-
-static RRDSET *rrdset_index_find(RRDHOST *host, const char *id) {
-    // TODO - the name index should have an acquired dictionary item, not just a pointer to RRDSET
-    if (unlikely(!host->rrdset_root_index))
-        return NULL;
-    return dictionary_get(host->rrdset_root_index, id);
-}
-
-// ----------------------------------------------------------------------------
-// RRDSET - find charts
-
-inline RRDSET *rrdset_find(RRDHOST *host, const char *id) {
-    netdata_log_debug(D_RRD_CALLS, "rrdset_find() for chart '%s' in host '%s'", id, rrdhost_hostname(host));
-    RRDSET *st = rrdset_index_find(host, id);
-
-    if(st)
-        st->last_accessed_time_s = now_realtime_sec();
-
-    return(st);
-}
-
-inline RRDSET *rrdset_find_bytype(RRDHOST *host, const char *type, const char *id) {
-    netdata_log_debug(D_RRD_CALLS, "rrdset_find_bytype() for chart '%s.%s' in host '%s'", type, id, rrdhost_hostname(host));
-
-    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) {
-    netdata_log_debug(D_RRD_CALLS, "rrdset_find_byname() for chart '%s' in host '%s'", name, rrdhost_hostname(host));
-    RRDSET *st = rrdset_index_find_name(host, name);
-    return(st);
-}
-
-RRDSET_ACQUIRED *rrdset_find_and_acquire(RRDHOST *host, const char *id) {
-    netdata_log_debug(D_RRD_CALLS, "rrdset_find_and_acquire() for host %s, chart %s", rrdhost_hostname(host), id);
-
-    return (RRDSET_ACQUIRED *)dictionary_get_and_acquire_item(host->rrdset_root_index, id);
-}
-
-RRDSET *rrdset_acquired_to_rrdset(RRDSET_ACQUIRED *rsa) {
-    if(unlikely(!rsa))
-        return NULL;
-
-    return (RRDSET *) dictionary_acquired_item_value((const DICTIONARY_ITEM *)rsa);
-}
-
-void rrdset_acquired_release(RRDSET_ACQUIRED *rsa) {
-    if(unlikely(!rsa))
-        return;
-
-    RRDSET *rs = rrdset_acquired_to_rrdset(rsa);
-    dictionary_acquired_item_release(rs->rrdhost->rrdset_root_index, (const DICTIONARY_ITEM *)rsa);
-}
-
-// ----------------------------------------------------------------------------
-// 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 != '.' && c != '-' && !isalnum(c))
-            c = '_';
-
-        *p++ = c;
-    }
-
-    *p = '\0';
-
-    return to;
-}
-
-int rrdset_reset_name(RRDSET *st, const char *name) {
-    if(unlikely(!strcmp(rrdset_name(st), name)))
-        return 1;
-
-    RRDHOST *host = st->rrdhost;
-
-    netdata_log_debug(D_RRD_CALLS, "rrdset_reset_name() old: '%s', new: '%s'", rrdset_name(st), name);
-
-    STRING *name_string = rrdset_fix_name(host, rrdset_id(st), rrdset_parts_type(st), string2str(st->name), name);
-    if(!name_string) return 0;
-
-    if(st->name) {
-        rrdset_index_del_name(host, st);
-        string_freez(st->name);
-        st->name = name_string;
-        rrdsetvar_rename_all(st);
-    }
-    else
-        st->name = name_string;
-
-    RRDDIM *rd;
-    rrddim_foreach_read(rd, st)
-        rrddimvar_rename_all(rd);
-    rrddim_foreach_done(rd);
-
-    rrdset_index_add_name(host, st);
-
-    rrdset_flag_clear(st, RRDSET_FLAG_EXPORTING_SEND);
-    rrdset_flag_clear(st, RRDSET_FLAG_EXPORTING_IGNORE);
-    rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_SEND);
-    rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_IGNORE);
-    rrdset_metadata_updated(st);
-
-    rrdcontext_updated_rrdset_name(st);
-    return 2;
-}
-
-// get the timestamp of the last entry in the round-robin database
-time_t rrdset_last_entry_s(RRDSET *st) {
-    RRDDIM *rd;
-    time_t last_entry_s  = 0;
-
-    rrddim_foreach_read(rd, st) {
-        time_t t = rrddim_last_entry_s(rd);
-        if(t > last_entry_s) last_entry_s = t;
-    }
-    rrddim_foreach_done(rd);
-
-    return last_entry_s;
-}
-
-time_t rrdset_last_entry_s_of_tier(RRDSET *st, size_t tier) {
-    RRDDIM *rd;
-    time_t last_entry_s  = 0;
-
-    rrddim_foreach_read(rd, st) {
-                time_t t = rrddim_last_entry_s_of_tier(rd, tier);
-                if(t > last_entry_s) last_entry_s = t;
-            }
-    rrddim_foreach_done(rd);
-
-    return last_entry_s;
-}
-
-// get the timestamp of first entry in the round-robin database
-time_t rrdset_first_entry_s(RRDSET *st) {
-    RRDDIM *rd;
-    time_t first_entry_s = LONG_MAX;
-
-    rrddim_foreach_read(rd, st) {
-        time_t t = rrddim_first_entry_s(rd);
-        if(t < first_entry_s)
-            first_entry_s = t;
-    }
-    rrddim_foreach_done(rd);
-
-    if (unlikely(LONG_MAX == first_entry_s)) return 0;
-    return first_entry_s;
-}
-
-time_t rrdset_first_entry_s_of_tier(RRDSET *st, size_t tier) {
-    if(unlikely(tier > storage_tiers))
-        return 0;
-
-    RRDDIM *rd;
-    time_t first_entry_s = LONG_MAX;
-
-    rrddim_foreach_read(rd, st) {
-        time_t t = rrddim_first_entry_s_of_tier(rd, tier);
-        if(t && t < first_entry_s)
-            first_entry_s = t;
-    }
-    rrddim_foreach_done(rd);
-
-    if (unlikely(LONG_MAX == first_entry_s)) return 0;
-    return first_entry_s;
-}
-
-void rrdset_get_retention_of_tier_for_collected_chart(RRDSET *st, time_t *first_time_s, time_t *last_time_s, time_t now_s, size_t tier) {
-    if(!now_s)
-        now_s = now_realtime_sec();
-
-    time_t db_first_entry_s = rrdset_first_entry_s_of_tier(st, tier);
-    time_t db_last_entry_s = st->last_updated.tv_sec; // we assume this is a collected RRDSET
-
-    if(unlikely(!db_last_entry_s)) {
-        db_last_entry_s = rrdset_last_entry_s_of_tier(st, tier);
-
-        if (unlikely(!db_last_entry_s)) {
-            // we assume this is a collected RRDSET
-            db_first_entry_s = 0;
-            db_last_entry_s = 0;
-        }
-    }
-
-    if(unlikely(db_last_entry_s > now_s)) {
-        internal_error(db_last_entry_s > now_s + 1,
-                       "RRDSET: 'host:%s/chart:%s' latest db time %ld is in the future, adjusting it to now %ld",
-                       rrdhost_hostname(st->rrdhost), rrdset_id(st),
-                       db_last_entry_s, now_s);
-        db_last_entry_s = now_s;
-    }
-
-    if(unlikely(db_first_entry_s && db_last_entry_s && db_first_entry_s >= db_last_entry_s)) {
-        internal_error(db_first_entry_s > db_last_entry_s,
-                       "RRDSET: 'host:%s/chart:%s' oldest db time %ld is bigger than latest db time %ld, adjusting it to (latest time %ld - update every %ld)",
-                       rrdhost_hostname(st->rrdhost), rrdset_id(st),
-                       db_first_entry_s, db_last_entry_s,
-                       db_last_entry_s, (time_t)st->update_every);
-        db_first_entry_s = db_last_entry_s - st->update_every;
-    }
-
-    if(unlikely(!db_first_entry_s && db_last_entry_s))
-        // this can be the case on the first data collection of a chart
-        db_first_entry_s = db_last_entry_s - st->update_every;
-
-    *first_time_s = db_first_entry_s;
-    *last_time_s = db_last_entry_s;
-}
-
-inline void rrdset_is_obsolete___safe_from_collector_thread(RRDSET *st) {
-    rrdset_pluginsd_receive_unslot(st);
-
-    if(unlikely(!(rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE)))) {
-//        netdata_log_info("Setting obsolete flag on chart 'host:%s/chart:%s'",
-//                rrdhost_hostname(st->rrdhost), rrdset_id(st));
-
-        rrdset_flag_set(st, RRDSET_FLAG_OBSOLETE);
-        rrdhost_flag_set(st->rrdhost, RRDHOST_FLAG_PENDING_OBSOLETE_CHARTS);
-
-        st->last_accessed_time_s = now_realtime_sec();
-
-        rrdset_metadata_updated(st);
-
-        // the chart will not get more updates (data collection)
-        // so, we have to push its definition now
-        rrdset_push_chart_definition_now(st);
-        rrdcontext_updated_rrdset_flags(st);
-    }
-}
-
-inline void rrdset_isnot_obsolete___safe_from_collector_thread(RRDSET *st) {
-    if(unlikely((rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE)))) {
-
-//        netdata_log_info("Clearing obsolete flag on chart 'host:%s/chart:%s'",
-//                rrdhost_hostname(st->rrdhost), rrdset_id(st));
-
-        rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
-        st->last_accessed_time_s = now_realtime_sec();
-
-        rrdset_metadata_updated(st);
-
-        // the chart will be pushed upstream automatically
-        // due to data collection
-        rrdcontext_updated_rrdset_flags(st);
-    }
-}
-
-inline void rrdset_update_heterogeneous_flag(RRDSET *st) {
-    RRDHOST *host = st->rrdhost;
-    (void)host;
-
-    RRDDIM *rd;
-
-    rrdset_flag_clear(st, RRDSET_FLAG_HOMOGENEOUS_CHECK);
-
-    bool init = false, is_heterogeneous = false;
-    RRD_ALGORITHM algorithm;
-    int32_t multiplier;
-    int32_t divisor;
-
-    rrddim_foreach_read(rd, st) {
-        if(!init) {
-            algorithm = rd->algorithm;
-            multiplier = rd->multiplier;
-            divisor = ABS(rd->divisor);
-            init = true;
-            continue;
-        }
-
-        if(algorithm != rd->algorithm || multiplier != ABS(rd->multiplier) || divisor != ABS(rd->divisor)) {
-            if(!rrdset_flag_check(st, RRDSET_FLAG_HETEROGENEOUS)) {
-                #ifdef NETDATA_INTERNAL_CHECKS
-                netdata_log_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 %d vs %d, "
-                     "divisor is %d vs %d).",
-                     rrddim_name(rd),
-                     rrdset_name(st),
-                     rrdhost_hostname(host),
-                     rrd_algorithm_name(rd->algorithm), rrd_algorithm_name(algorithm),
-                     rd->multiplier, multiplier,
-                     rd->divisor, divisor
-                );
-                #endif
-                rrdset_flag_set(st, RRDSET_FLAG_HETEROGENEOUS);
-            }
-
-            is_heterogeneous = true;
-            break;
-        }
-    }
-    rrddim_foreach_done(rd);
-
-    if(!is_heterogeneous) {
-        rrdset_flag_clear(st, RRDSET_FLAG_HETEROGENEOUS);
-        rrdcontext_updated_rrdset_flags(st);
-    }
-}
-
-// ----------------------------------------------------------------------------
-// RRDSET - reset a chart
-
-void rrdset_reset(RRDSET *st) {
-    netdata_log_debug(D_RRD_CALLS, "rrdset_reset() %s", rrdset_name(st));
-
-    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->db.current_entry = 0;
-    st->counter = 0;
-    st->counter_done = 0;
-
-    RRDDIM *rd;
-    rrddim_foreach_read(rd, st) {
-        rd->collector.last_collected_time.tv_sec = 0;
-        rd->collector.last_collected_time.tv_usec = 0;
-        rd->collector.counter = 0;
-
-        if(!rrddim_flag_check(rd, RRDDIM_FLAG_ARCHIVED)) {
-            for(size_t tier = 0; tier < storage_tiers ;tier++)
-                storage_engine_store_flush(rd->tiers[tier].db_collection_handle);
-        }
-    }
-    rrddim_foreach_done(rd);
-}
-
-// ----------------------------------------------------------------------------
-// RRDSET - helpers for rrdset_create()
-
-inline long align_entries_to_pagesize(RRD_MEMORY_MODE mode, long entries) {
-    if(mode == RRD_MEMORY_MODE_DBENGINE) return 0;
-    if(mode == RRD_MEMORY_MODE_NONE) return 5;
-
-    if(entries < 5) entries = 5;
-    if(entries > RRD_HISTORY_ENTRIES_MAX) entries = RRD_HISTORY_ENTRIES_MAX;
-
-    if(mode == RRD_MEMORY_MODE_MAP || mode == RRD_MEMORY_MODE_SAVE || mode == RRD_MEMORY_MODE_RAM) {
-        long header_size = 0;
-
-        if(mode == RRD_MEMORY_MODE_MAP || mode == RRD_MEMORY_MODE_SAVE)
-            header_size = (long)rrddim_memory_file_header_size();
-
-        long page = (long)sysconf(_SC_PAGESIZE);
-        long size = (long)(header_size + entries * sizeof(storage_number));
-        if (unlikely(size % page)) {
-            size -= (size % page);
-            size += page;
-
-            long n = (long)((size - header_size) / 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;
-    rrdset_index_del(st->rrdhost, st);
-}
-
-void rrdset_save(RRDSET *st) {
-    rrdset_memory_file_save(st);
-
-    RRDDIM *rd;
-    rrddim_foreach_read(rd, st)
-        rrddim_memory_file_save(rd);
-    rrddim_foreach_done(rd);
-}
-
-void rrdset_delete_files(RRDSET *st) {
-    RRDDIM *rd;
-
-    netdata_log_info("Deleting chart '%s' ('%s') from disk...", rrdset_id(st), rrdset_name(st));
-
-    if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || st->rrd_memory_mode == RRD_MEMORY_MODE_MAP) {
-        const char *cache_filename = rrdset_cache_filename(st);
-        if(cache_filename) {
-            netdata_log_info("Deleting chart header file '%s'.", cache_filename);
-            if (unlikely(unlink(cache_filename) == -1))
-                netdata_log_error("Cannot delete chart header file '%s'", cache_filename);
-        }
-        else
-            netdata_log_error("Cannot find the cache filename of chart '%s'", rrdset_id(st));
-    }
-
-    rrddim_foreach_read(rd, st) {
-        const char *cache_filename = rrddim_cache_filename(rd);
-        if(!cache_filename) continue;
-
-        netdata_log_info("Deleting dimension file '%s'.", cache_filename);
-        if(unlikely(unlink(cache_filename) == -1))
-            netdata_log_error("Cannot delete dimension file '%s'", cache_filename);
-    }
-    rrddim_foreach_done(rd);
-
-    if(st->db.cache_dir)
-        recursively_delete_dir(st->db.cache_dir, "left-over chart");
-}
-
-void rrdset_delete_obsolete_dimensions(RRDSET *st) {
-    RRDDIM *rd;
-
-    netdata_log_info("Deleting dimensions of chart '%s' ('%s') from disk...", rrdset_id(st), rrdset_name(st));
-
-    rrddim_foreach_read(rd, st) {
-        if(rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE)) {
-            const char *cache_filename = rrddim_cache_filename(rd);
-            if(!cache_filename) continue;
-            netdata_log_info("Deleting dimension file '%s'.", cache_filename);
-            if(unlikely(unlink(cache_filename) == -1))
-                netdata_log_error("Cannot delete dimension file '%s'", cache_filename);
-        }
-    }
-    rrddim_foreach_done(rd);
-}
-
-// ----------------------------------------------------------------------------
-// RRDSET - create a chart
-
-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 (host != localhost)
-        host->child_last_chart_command = now_realtime_sec();
-
-    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>"
-        );
-
-    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>"
-        );
-
-    // ------------------------------------------------------------------------
-    // check if it already exists
-
-    char full_id[RRD_ID_LENGTH_MAX + 1];
-    snprintfz(full_id, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
-
-    // ------------------------------------------------------------------------
-    // allocate it
-
-    netdata_log_debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
-
-    struct rrdset_constructor tmp = {
-        .host = host,
-        .type = type,
-        .id = id,
-        .name = name,
-        .family = family,
-        .context = context,
-        .title = title,
-        .units = units,
-        .plugin = plugin,
-        .module = module,
-        .priority = priority,
-        .update_every = update_every,
-        .chart_type = chart_type,
-        .memory_mode = memory_mode,
-        .history_entries = history_entries,
-    };
-
-    RRDSET *st = rrdset_index_add(host, full_id, &tmp);
-    return(st);
-}
-
-// ----------------------------------------------------------------------------
-// RRDSET - data collection iteration control
-
-void rrdset_timed_next(RRDSET *st, struct timeval now, usec_t duration_since_last_update) {
-    #ifdef NETDATA_INTERNAL_CHECKS
-    char *discard_reason = NULL;
-    usec_t discarded = duration_since_last_update;
-    #endif
-
-    if(unlikely(rrdset_flag_check(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 duration supplied
-        duration_since_last_update = 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
-        duration_since_last_update = st->update_every * USEC_PER_SEC;
-        #ifdef NETDATA_INTERNAL_CHECKS
-        if(!discard_reason) discard_reason = "FIRST DATA COLLECTION";
-        #endif
-    }
-    else if(unlikely(!duration_since_last_update)) {
-        // no dt given by the plugin
-        duration_since_last_update = 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
-            #ifdef NETDATA_INTERNAL_CHECKS
-            netdata_log_info("RRD database for chart '%s' on host '%s' is %0.5" NETDATA_DOUBLE_MODIFIER
-                " secs in the future (counter #%u, update #%u). Adjusting it to current time."
-                , rrdset_id(st)
-                , rrdhost_hostname(st->rrdhost)
-                , (NETDATA_DOUBLE)-since_last_usec / USEC_PER_SEC
-                , st->counter
-                , st->counter_done
-                );
-            #endif
-
-            duration_since_last_update = 0;
-
-            #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
-            #ifdef NETDATA_INTERNAL_CHECKS
-            netdata_log_info("RRD database for chart '%s' on host '%s' is %0.5" NETDATA_DOUBLE_MODIFIER
-                " secs in the past (counter #%u, update #%u). Adjusting it to current time.",
-                rrdset_id(st), rrdhost_hostname(st->rrdhost), (NETDATA_DOUBLE)since_last_usec / USEC_PER_SEC,
-                st->counter, st->counter_done);
-            #endif
-
-            duration_since_last_update = (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) duration_since_last_update < since_last_usec) {
-            static __thread susec_t min_delta = USEC_PER_SEC * 3600, permanent_min_delta = 0;
-            static __thread time_t last_time_s = 0;
-
-            // the first time initialize it so that it will make the check later
-            if(last_time_s == 0) last_time_s = now.tv_sec + 60;
-
-            susec_t delta = since_last_usec - (susec_t) duration_since_last_update;
-            if(delta < min_delta) min_delta = delta;
-
-            if(now.tv_sec >= last_time_s + 60) {
-                last_time_s = now.tv_sec;
-
-                if(min_delta > permanent_min_delta) {
-                    netdata_log_info("MINIMUM MICROSECONDS DELTA of thread %d increased from %"PRIi64" to %"PRIi64" (+%"PRIi64")", gettid(), permanent_min_delta, min_delta, min_delta - permanent_min_delta);
-                    permanent_min_delta = min_delta;
-                }
-
-                min_delta = USEC_PER_SEC * 3600;
-            }
-        }
-#endif
-    }
-
-    netdata_log_debug(D_RRD_CALLS, "rrdset_timed_next() for chart %s with duration since last update %"PRIu64" usec", rrdset_name(st), duration_since_last_update);
-    rrdset_debug(st, "NEXT: %"PRIu64" microseconds", duration_since_last_update);
-
-    internal_error(discarded && discarded != duration_since_last_update,
-                   "host '%s', chart '%s': discarded data collection time of %"PRIu64" usec, "
-                   "replaced with %"PRIu64" usec, reason: '%s'"
-                   , rrdhost_hostname(st->rrdhost)
-                   , rrdset_id(st)
-                   , discarded
-                   , duration_since_last_update
-                   , discard_reason?discard_reason:"UNDEFINED"
-                   );
-
-    st->usec_since_last_update = duration_since_last_update;
-}
-
-inline void rrdset_next_usec_unfiltered(RRDSET *st, usec_t duration_since_last_update) {
-    if(unlikely(!st->last_collected_time.tv_sec || !duration_since_last_update || (rrdset_flag_check(st, RRDSET_FLAG_SYNC_CLOCK)))) {
-        // call the full next_usec() function
-        rrdset_next_usec(st, duration_since_last_update);
-        return;
-    }
-
-    st->usec_since_last_update = duration_since_last_update;
-}
-
-inline void rrdset_next_usec(RRDSET *st, usec_t duration_since_last_update) {
-    struct timeval now;
-
-    now_realtime_timeval(&now);
-    rrdset_timed_next(st, now, duration_since_last_update);
-}
-
-// ----------------------------------------------------------------------------
-// RRDSET - process the collected values for all dimensions of a chart
-
-static inline usec_t rrdset_init_last_collected_time(RRDSET *st, struct timeval now) {
-    st->last_collected_time = now;
-    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;
-
-    rrdset_debug(st, "initialized last collected time to %0.3" NETDATA_DOUBLE_MODIFIER, (NETDATA_DOUBLE)last_collect_ut / USEC_PER_SEC);
-
-    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);
-
-    rrdset_debug(st, "updated last collected time to %0.3" NETDATA_DOUBLE_MODIFIER, (NETDATA_DOUBLE)last_collect_ut / USEC_PER_SEC);
-
-    return last_collect_ut;
-}
-
-static inline void 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);
-}
-
-static __thread size_t rrdset_done_statistics_points_stored_per_tier[RRD_STORAGE_TIERS];
-
-static inline time_t tier_next_point_time_s(RRDDIM *rd, struct rrddim_tier *t, time_t now_s) {
-    time_t loop = (time_t)rd->rrdset->update_every * (time_t)t->tier_grouping;
-    return now_s + loop - ((now_s + loop) % loop);
-}
-
-void store_metric_at_tier(RRDDIM *rd, size_t tier, struct rrddim_tier *t, STORAGE_POINT sp, usec_t now_ut __maybe_unused) {
-    if (unlikely(!t->next_point_end_time_s))
-        t->next_point_end_time_s = tier_next_point_time_s(rd, t, sp.end_time_s);
-
-    if(unlikely(sp.start_time_s >= t->next_point_end_time_s)) {
-        // flush the virtual point, it is done
-
-        if (likely(!storage_point_is_unset(t->virtual_point))) {
-
-            storage_engine_store_metric(
-                t->db_collection_handle,
-                t->next_point_end_time_s * USEC_PER_SEC,
-                t->virtual_point.sum,
-                t->virtual_point.min,
-                t->virtual_point.max,
-                t->virtual_point.count,
-                t->virtual_point.anomaly_count,
-                t->virtual_point.flags);
-        }
-        else {
-            storage_engine_store_metric(
-                t->db_collection_handle,
-                t->next_point_end_time_s * USEC_PER_SEC,
-                NAN,
-                NAN,
-                NAN,
-                0,
-                0, SN_FLAG_NONE);
-        }
-
-        rrdset_done_statistics_points_stored_per_tier[tier]++;
-        t->virtual_point.count = 0; // make the point unset
-        t->next_point_end_time_s = tier_next_point_time_s(rd, t, sp.end_time_s);
-    }
-
-    // merge the dates into our virtual point
-    if (unlikely(sp.start_time_s < t->virtual_point.start_time_s))
-        t->virtual_point.start_time_s = sp.start_time_s;
-
-    if (likely(sp.end_time_s > t->virtual_point.end_time_s))
-        t->virtual_point.end_time_s = sp.end_time_s;
-
-    // merge the values into our virtual point
-    if (likely(!storage_point_is_gap(sp))) {
-        // we aggregate only non NULLs into higher tiers
-
-        if (likely(!storage_point_is_unset(t->virtual_point))) {
-            // merge the collected point to our virtual one
-            t->virtual_point.sum += sp.sum;
-            t->virtual_point.min = MIN(t->virtual_point.min, sp.min);
-            t->virtual_point.max = MAX(t->virtual_point.max, sp.max);
-            t->virtual_point.count += sp.count;
-            t->virtual_point.anomaly_count += sp.anomaly_count;
-            t->virtual_point.flags |= sp.flags;
-        }
-        else {
-            // reset our virtual point to this one
-            t->virtual_point = sp;
-        }
-    }
-}
-#ifdef NETDATA_LOG_COLLECTION_ERRORS
-void rrddim_store_metric_with_trace(RRDDIM *rd, usec_t point_end_time_ut, NETDATA_DOUBLE n, SN_FLAGS flags, const char *function) {
-#else // !NETDATA_LOG_COLLECTION_ERRORS
-void rrddim_store_metric(RRDDIM *rd, usec_t point_end_time_ut, NETDATA_DOUBLE n, SN_FLAGS flags) {
-#endif // !NETDATA_LOG_COLLECTION_ERRORS
-
-    static __thread struct log_stack_entry lgs[] = {
-            [0] = ND_LOG_FIELD_STR(NDF_NIDL_DIMENSION, NULL),
-            [1] = ND_LOG_FIELD_END(),
-    };
-    lgs[0].str = rd->id;
-    log_stack_push(lgs);
-
-#ifdef NETDATA_LOG_COLLECTION_ERRORS
-    rd->rrddim_store_metric_count++;
-
-    if(likely(rd->rrddim_store_metric_count > 1)) {
-        usec_t expected = rd->rrddim_store_metric_last_ut + rd->update_every * USEC_PER_SEC;
-
-        if(point_end_time_ut != rd->rrddim_store_metric_last_ut) {
-            internal_error(true,
-                           "%s COLLECTION: 'host:%s/chart:%s/dim:%s' granularity %d, collection %zu, expected to store at tier 0 a value at %llu, but it gave %llu [%s%llu usec] (called from %s(), previously by %s())",
-                           (point_end_time_ut < rd->rrddim_store_metric_last_ut) ? "**PAST**" : "GAP",
-                           rrdhost_hostname(rd->rrdset->rrdhost), rrdset_id(rd->rrdset), rrddim_id(rd),
-                           rd->update_every,
-                           rd->rrddim_store_metric_count,
-                           expected, point_end_time_ut,
-                           (point_end_time_ut < rd->rrddim_store_metric_last_ut)?"by -" : "gap ",
-                           expected - point_end_time_ut,
-                           function,
-                           rd->rrddim_store_metric_last_caller?rd->rrddim_store_metric_last_caller:"none");
-        }
-    }
-
-    rd->rrddim_store_metric_last_ut = point_end_time_ut;
-    rd->rrddim_store_metric_last_caller = function;
-#endif // NETDATA_LOG_COLLECTION_ERRORS
-
-    // store the metric on tier 0
-    storage_engine_store_metric(rd->tiers[0].db_collection_handle, point_end_time_ut,
-                                n, 0, 0,
-                                1, 0, flags);
-
-    rrdset_done_statistics_points_stored_per_tier[0]++;
-
-    time_t now_s = (time_t)(point_end_time_ut / USEC_PER_SEC);
-
-    STORAGE_POINT sp = {
-        .start_time_s = now_s - rd->rrdset->update_every,
-        .end_time_s = now_s,
-        .min = n,
-        .max = n,
-        .sum = n,
-        .count = 1,
-        .anomaly_count = (flags & SN_FLAG_NOT_ANOMALOUS) ? 0 : 1,
-        .flags = flags
-    };
-
-    for(size_t tier = 1; tier < storage_tiers ;tier++) {
-        if(unlikely(!rd->tiers[tier].db_metric_handle)) continue;
-
-        struct rrddim_tier *t = &rd->tiers[tier];
-
-        if(!rrddim_option_check(rd, RRDDIM_OPTION_BACKFILLED_HIGH_TIERS)) {
-            // we have not collected this tier before
-            // let's fill any gap that may exist
-            rrdr_fill_tier_gap_from_smaller_tiers(rd, tier, now_s);
-            rrddim_option_set(rd, RRDDIM_OPTION_BACKFILLED_HIGH_TIERS);
-        }
-
-        store_metric_at_tier(rd, tier, t, sp, point_end_time_ut);
-    }
-
-    rrdcontext_collected_rrddim(rd);
-    log_stack_pop(&lgs);
-}
-
-void store_metric_collection_completed() {
-    global_statistics_rrdset_done_chart_collection_completed(rrdset_done_statistics_points_stored_per_tier);
-}
-
-// caching of dimensions rrdset_done() and rrdset_done_interpolate() loop through
-struct rda_item {
-    const DICTIONARY_ITEM *item;
-    RRDDIM *rd;
-};
-
-static __thread struct rda_item *thread_rda = NULL;
-static __thread size_t thread_rda_entries = 0;
-
-struct rda_item *rrdset_thread_rda_get(size_t *dimensions) {
-
-    if(unlikely(!thread_rda || (*dimensions) > thread_rda_entries)) {
-        size_t old_mem = thread_rda_entries * sizeof(struct rda_item);
-        freez(thread_rda);
-        thread_rda_entries = *dimensions;
-        size_t new_mem = thread_rda_entries * sizeof(struct rda_item);
-        thread_rda = mallocz(new_mem);
-
-        __atomic_add_fetch(&netdata_buffers_statistics.rrdset_done_rda_size, new_mem - old_mem, __ATOMIC_RELAXED);
-    }
-
-    *dimensions = thread_rda_entries;
-    return thread_rda;
-}
-
-void rrdset_thread_rda_free(void) {
-    __atomic_sub_fetch(&netdata_buffers_statistics.rrdset_done_rda_size, thread_rda_entries * sizeof(struct rda_item), __ATOMIC_RELAXED);
-
-    freez(thread_rda);
-    thread_rda = NULL;
-    thread_rda_entries = 0;
-}
-
-static inline size_t rrdset_done_interpolate(
-        RRDSET_STREAM_BUFFER *rsb
-        , RRDSET *st
-        , struct rda_item *rda_base
-        , size_t rda_slots
-        , 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 has_reset_value
-) {
-    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->db.current_entry;
-
-    SN_FLAGS storage_flags = SN_DEFAULT_FLAGS;
-
-    if (has_reset_value)
-        storage_flags |= SN_FLAG_RESET;
-
-    for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
-
-        internal_error(iterations < 0,
-                       "RRDSET: '%s': iterations calculation wrapped! "
-                       "first_ut = %"PRIu64", last_stored_ut = %"PRIu64", next_store_ut = %"PRIu64", now_collect_ut = %"PRIu64""
-                       , rrdset_id(st)
-                       , first_ut
-                       , last_stored_ut
-                       , next_store_ut
-                       , now_collect_ut
-                       );
-
-        rrdset_debug(st, "last_stored_ut = %0.3" NETDATA_DOUBLE_MODIFIER " (last updated time)", (NETDATA_DOUBLE)last_stored_ut/USEC_PER_SEC);
-        rrdset_debug(st, "next_store_ut  = %0.3" NETDATA_DOUBLE_MODIFIER " (next interpolation point)", (NETDATA_DOUBLE)next_store_ut/USEC_PER_SEC);
-
-        last_ut = next_store_ut;
-
-        ml_chart_update_begin(st);
-
-        struct rda_item *rda;
-        size_t dim_id;
-        for(dim_id = 0, rda = rda_base ; dim_id < rda_slots ; ++dim_id, ++rda) {
-            rd = rda->rd;
-            if(unlikely(!rd)) continue;
-
-            NETDATA_DOUBLE new_value;
-
-            switch(rd->algorithm) {
-                case RRD_ALGORITHM_INCREMENTAL:
-                    new_value = (NETDATA_DOUBLE)
-                            (      rd->collector.calculated_value
-                                   * (NETDATA_DOUBLE)(next_store_ut - last_collect_ut)
-                                   / (NETDATA_DOUBLE)(now_collect_ut - last_collect_ut)
-                            );
-
-                    rrdset_debug(st, "%s: CALC2 INC " NETDATA_DOUBLE_FORMAT " = "
-                                 NETDATA_DOUBLE_FORMAT
-                                " * (%"PRIu64" - %"PRIu64")"
-                                " / (%"PRIu64" - %"PRIu64""
-                              , rrddim_name(rd)
-                              , new_value
-                              , rd->collector.calculated_value
-                              , next_store_ut, last_collect_ut
-                              , now_collect_ut, last_collect_ut
-                    );
-
-                    rd->collector.calculated_value -= new_value;
-                    new_value += rd->collector.last_calculated_value;
-                    rd->collector.last_calculated_value = 0;
-                    new_value /= (NETDATA_DOUBLE)st->update_every;
-
-                    if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
-
-                        rrdset_debug(st, "%s: COLLECTION POINT IS SHORT " NETDATA_DOUBLE_FORMAT " - EXTRAPOLATING",
-                                    rrddim_name(rd)
-                                  , (NETDATA_DOUBLE)(next_store_ut - last_stored_ut)
-                        );
-
-                        new_value = new_value * (NETDATA_DOUBLE)(st->update_every * USEC_PER_SEC) / (NETDATA_DOUBLE)(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->collector.calculated_value;
-                    }
-                    else {
-                        // we have missed an update
-                        // interpolate in the middle values
-
-                        new_value = (NETDATA_DOUBLE)
-                                (   (     (rd->collector.calculated_value - rd->collector.last_calculated_value)
-                                          * (NETDATA_DOUBLE)(next_store_ut - last_collect_ut)
-                                          / (NETDATA_DOUBLE)(now_collect_ut - last_collect_ut)
-                                    )
-                                    +  rd->collector.last_calculated_value
-                                );
-
-                        rrdset_debug(st, "%s: CALC2 DEF " NETDATA_DOUBLE_FORMAT " = ((("
-                                            "(" NETDATA_DOUBLE_FORMAT " - " NETDATA_DOUBLE_FORMAT ")"
-                                            " * %"PRIu64""
-                                            " / %"PRIu64") + " NETDATA_DOUBLE_FORMAT, rrddim_name(rd)
-                                  , new_value
-                                  , rd->collector.calculated_value, rd->collector.last_calculated_value
-                                  , (next_store_ut - first_ut)
-                                  , (now_collect_ut - first_ut), rd->collector.last_calculated_value
-                        );
-                    }
-                    break;
-            }
-
-            time_t current_time_s = (time_t) (next_store_ut / USEC_PER_SEC);
-
-            if(unlikely(!store_this_entry)) {
-                (void) ml_dimension_is_anomalous(rd, current_time_s, 0, false);
-
-                if(rsb->wb && rsb->v2)
-                    rrddim_push_metrics_v2(rsb, rd, next_store_ut, NAN, SN_FLAG_NONE);
-
-                rrddim_store_metric(rd, next_store_ut, NAN, SN_FLAG_NONE);
-                continue;
-            }
-
-            if(likely(rrddim_check_updated(rd) && rd->collector.counter > 1 && iterations < gap_when_lost_iterations_above)) {
-                uint32_t dim_storage_flags = storage_flags;
-
-                if (ml_dimension_is_anomalous(rd, current_time_s, new_value, true)) {
-                    // clear anomaly bit: 0 -> is anomalous, 1 -> not anomalous
-                    dim_storage_flags &= ~((storage_number)SN_FLAG_NOT_ANOMALOUS);
-                }
-
-                if(rsb->wb && rsb->v2)
-                    rrddim_push_metrics_v2(rsb, rd, next_store_ut, new_value, dim_storage_flags);
-
-                rrddim_store_metric(rd, next_store_ut, new_value, dim_storage_flags);
-                rd->collector.last_stored_value = new_value;
-            }
-            else {
-                (void) ml_dimension_is_anomalous(rd, current_time_s, 0, false);
-
-                rrdset_debug(st, "%s: STORE[%ld] = NON EXISTING ", rrddim_name(rd), current_entry);
-
-                if(rsb->wb && rsb->v2)
-                    rrddim_push_metrics_v2(rsb, rd, next_store_ut, NAN, SN_FLAG_NONE);
-
-                rrddim_store_metric(rd, next_store_ut, NAN, SN_FLAG_NONE);
-                rd->collector.last_stored_value = NAN;
-            }
-
-            stored_entries++;
-        }
-
-        ml_chart_update_end(st);
-
-        // reset the storage flags for the next point, if any;
-        storage_flags = SN_DEFAULT_FLAGS;
-
-        st->counter = ++counter;
-        st->db.current_entry = current_entry = ((current_entry + 1) >= st->db.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;
-}
-
-void rrdset_done(RRDSET *st) {
-    struct timeval now;
-
-    now_realtime_timeval(&now);
-    rrdset_timed_done(st, now, /* pending_rrdset_next = */ st->counter_done != 0);
-}
-
-void rrdset_timed_done(RRDSET *st, struct timeval now, bool pending_rrdset_next) {
-    if(unlikely(!service_running(SERVICE_COLLECTORS))) return;
-
-    RRDSET_STREAM_BUFFER stream_buffer = { .wb = NULL, };
-    if(unlikely(rrdhost_has_rrdpush_sender_enabled(st->rrdhost)))
-        stream_buffer = rrdset_push_metric_initialize(st, now.tv_sec);
-
-    spinlock_lock(&st->data_collection_lock);
-
-    if (pending_rrdset_next)
-        rrdset_timed_next(st, now, 0ULL);
-
-    netdata_log_debug(D_RRD_CALLS, "rrdset_done() for chart '%s'", rrdset_name(st));
-
-    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
-
-    RRDSET_FLAGS rrdset_flags = rrdset_flag_check(st, ~0);
-    if(unlikely(rrdset_flags & RRDSET_FLAG_COLLECTION_FINISHED)) {
-        spinlock_unlock(&st->data_collection_lock);
-        return;
-    }
-
-    if (unlikely(rrdset_flags & RRDSET_FLAG_OBSOLETE)) {
-        netdata_log_error("Chart '%s' has the OBSOLETE flag set, but it is collected.", rrdset_id(st));
-        rrdset_isnot_obsolete___safe_from_collector_thread(st);
-    }
-
-    // check if the chart has a long time to be updated
-    if(unlikely(st->usec_since_last_update > MAX(st->db.entries, 60) * update_every_ut)) {
-        nd_log_daemon(NDLP_DEBUG, "host '%s', chart '%s': took too long to be updated (counter #%u, update #%u, %0.3" NETDATA_DOUBLE_MODIFIER
-            " secs). Resetting it.", rrdhost_hostname(st->rrdhost), rrdset_id(st), st->counter, st->counter_done,
-            (NETDATA_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;
-    }
-
-    rrdset_debug(st, "microseconds since last update: %"PRIu64"", st->usec_since_last_update);
-
-    // 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, now) - 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 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->db.entries * update_every_ut &&
-                st->rrd_memory_mode != RRD_MEMORY_MODE_DBENGINE)) {
-        netdata_log_info(
-            "'%s': too old data (last updated at %"PRId64".%"PRId64", last collected at %"PRId64".%"PRId64"). "
-            "Resetting it. Will not store the next entry.",
-            rrdset_id(st),
-            (int64_t)st->last_updated.tv_sec,
-            (int64_t)st->last_updated.tv_usec,
-            (int64_t)st->last_collected_time.tv_sec,
-            (int64_t)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;
-    }
-
-    // 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)) {
-        // 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_flags & RRDSET_FLAG_STORE_FIRST)) {
-            store_this_entry = 1;
-            last_collect_ut = next_store_ut - update_every_ut;
-
-            rrdset_debug(st, "Fixed first entry.");
-        }
-        else {
-            store_this_entry = 0;
-
-            rrdset_debug(st, "Will not store the next entry.");
-        }
-    }
-
-    st->counter_done++;
-
-    if(stream_buffer.wb && !stream_buffer.v2)
-        rrdset_push_metrics_v1(&stream_buffer, st);
-
-    uint32_t has_reset_value = 0;
-
-    size_t rda_slots = dictionary_entries(st->rrddim_root_index);
-    struct rda_item *rda_base = rrdset_thread_rda_get(&rda_slots);
-
-    size_t dim_id;
-    size_t dimensions = 0;
-    struct rda_item *rda = rda_base;
-    total_number collected_total = 0;
-    total_number last_collected_total = 0;
-    rrddim_foreach_read(rd, st) {
-        if(rd_dfe.counter >= rda_slots)
-            break;
-
-        rda = &rda_base[dimensions++];
-
-        if(rrddim_flag_check(rd, RRDDIM_FLAG_ARCHIVED)) {
-            rda->item = NULL;
-            rda->rd = NULL;
-            continue;
-        }
-
-        // store the dimension in the array
-        rda->item = dictionary_acquired_item_dup(st->rrddim_root_index, rd_dfe.item);
-        rda->rd = dictionary_acquired_item_value(rda->item);
-
-        // calculate totals
-        if(likely(rrddim_check_updated(rd))) {
-            // 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->algorithm == RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL && rd->collector.last_collected_value > rd->collector.collected_value)) {
-                netdata_log_debug(D_RRD_STATS, "'%s' / '%s': RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
-                , rrdset_id(st)
-                , rrddim_name(rd)
-                , rd->collector.last_collected_value
-                , rd->collector.collected_value
-                );
-
-                if(!(rrddim_option_check(rd, RRDDIM_OPTION_DONT_DETECT_RESETS_OR_OVERFLOWS)))
-                    has_reset_value = 1;
-
-                rd->collector.last_collected_value = rd->collector.collected_value;
-            }
-
-            last_collected_total += rd->collector.last_collected_value;
-            collected_total += rd->collector.collected_value;
-
-            if(unlikely(rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE))) {
-                netdata_log_error("Dimension %s in chart '%s' has the OBSOLETE flag set, but it is collected.", rrddim_name(rd), rrdset_id(st));
-                rrddim_isnot_obsolete___safe_from_collector_thread(st, rd);
-            }
-        }
-    }
-    rrddim_foreach_done(rd);
-    rda_slots = dimensions;
-
-    rrdset_debug(st, "last_collect_ut = %0.3" NETDATA_DOUBLE_MODIFIER " (last collection time)", (NETDATA_DOUBLE)last_collect_ut/USEC_PER_SEC);
-    rrdset_debug(st, "now_collect_ut  = %0.3" NETDATA_DOUBLE_MODIFIER " (current collection time)", (NETDATA_DOUBLE)now_collect_ut/USEC_PER_SEC);
-    rrdset_debug(st, "last_stored_ut  = %0.3" NETDATA_DOUBLE_MODIFIER " (last updated time)", (NETDATA_DOUBLE)last_stored_ut/USEC_PER_SEC);
-    rrdset_debug(st, "next_store_ut   = %0.3" NETDATA_DOUBLE_MODIFIER " (next interpolation point)", (NETDATA_DOUBLE)next_store_ut/USEC_PER_SEC);
-
-    // process all dimensions to calculate their values
-    // based on the collected figures only
-    // at this stage we do not interpolate anything
-    for(dim_id = 0, rda = rda_base ; dim_id < rda_slots ; ++dim_id, ++rda) {
-        rd = rda->rd;
-        if(unlikely(!rd)) continue;
-
-        if(unlikely(!rrddim_check_updated(rd))) {
-            rd->collector.calculated_value = 0;
-            continue;
-        }
-
-        rrdset_debug(st, "%s: START "
-                " last_collected_value = " COLLECTED_NUMBER_FORMAT
-                " collected_value = " COLLECTED_NUMBER_FORMAT
-                " last_calculated_value = " NETDATA_DOUBLE_FORMAT
-                " calculated_value = " NETDATA_DOUBLE_FORMAT
-                     , rrddim_name(rd)
-                     , rd->collector.last_collected_value
-                     , rd->collector.collected_value
-                     , rd->collector.last_calculated_value
-                     , rd->collector.calculated_value
-        );
-
-        switch(rd->algorithm) {
-            case RRD_ALGORITHM_ABSOLUTE:
-                rd->collector.calculated_value = (NETDATA_DOUBLE)rd->collector.collected_value
-                                                 * (NETDATA_DOUBLE)rd->multiplier
-                                                 / (NETDATA_DOUBLE)rd->divisor;
-
-                rrdset_debug(st, "%s: CALC ABS/ABS-NO-IN " NETDATA_DOUBLE_FORMAT " = "
-                            COLLECTED_NUMBER_FORMAT
-                            " * " NETDATA_DOUBLE_FORMAT
-                            " / " NETDATA_DOUBLE_FORMAT
-                          , rrddim_name(rd)
-                          , rd->collector.calculated_value
-                          , rd->collector.collected_value
-                          , (NETDATA_DOUBLE)rd->multiplier
-                          , (NETDATA_DOUBLE)rd->divisor
-                );
-                break;
-
-            case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
-                if(unlikely(!collected_total))
-                    rd->collector.calculated_value = 0;
-                else
-                    // the percentage of the current value
-                    // over the total of all dimensions
-                    rd->collector.calculated_value =
-                            (NETDATA_DOUBLE)100
-                            * (NETDATA_DOUBLE)rd->collector.collected_value
-                            / (NETDATA_DOUBLE)collected_total;
-
-                rrdset_debug(st, "%s: CALC PCENT-ROW " NETDATA_DOUBLE_FORMAT " = 100"
-                            " * " COLLECTED_NUMBER_FORMAT
-                            " / " COLLECTED_NUMBER_FORMAT
-                          , rrddim_name(rd)
-                          , rd->collector.calculated_value
-                          , rd->collector.collected_value
-                          , collected_total
-                );
-                break;
-
-            case RRD_ALGORITHM_INCREMENTAL:
-                if(unlikely(rd->collector.counter <= 1)) {
-                    rd->collector.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->collector.last_collected_value > (uint64_t)rd->collector.collected_value)) {
-                    netdata_log_debug(D_RRD_STATS, "'%s' / '%s': RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
-                          , rrdset_id(st)
-                          , rrddim_name(rd)
-                          , rd->collector.last_collected_value
-                          , rd->collector.collected_value);
-
-                    if(!(rrddim_option_check(rd, RRDDIM_OPTION_DONT_DETECT_RESETS_OR_OVERFLOWS)))
-                        has_reset_value = 1;
-
-                    uint64_t last = (uint64_t)rd->collector.last_collected_value;
-                    uint64_t new = (uint64_t)rd->collector.collected_value;
-                    uint64_t max = (uint64_t)rd->collector.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->collector.calculated_value +=
-                                (NETDATA_DOUBLE) delta
-                                * (NETDATA_DOUBLE) rd->multiplier
-                                / (NETDATA_DOUBLE) 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->collector.calculated_value += (NETDATA_DOUBLE)0;
-                    }
-                }
-                else {
-                    rd->collector.calculated_value +=
-                            (NETDATA_DOUBLE) (rd->collector.collected_value - rd->collector.last_collected_value)
-                            * (NETDATA_DOUBLE) rd->multiplier
-                            / (NETDATA_DOUBLE) rd->divisor;
-                }
-
-                rrdset_debug(st, "%s: CALC INC PRE " NETDATA_DOUBLE_FORMAT " = ("
-                            COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
-                            ")"
-                                    " * " NETDATA_DOUBLE_FORMAT
-                            " / " NETDATA_DOUBLE_FORMAT
-                          , rrddim_name(rd)
-                          , rd->collector.calculated_value
-                          , rd->collector.collected_value, rd->collector.last_collected_value
-                          , (NETDATA_DOUBLE)rd->multiplier
-                          , (NETDATA_DOUBLE)rd->divisor
-                );
-                break;
-
-            case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
-                if(unlikely(rd->collector.counter <= 1)) {
-                    rd->collector.calculated_value = 0;
-                    continue;
-                }
-
-                // the percentage of the current increment
-                // over the increment of all dimensions together
-                if(unlikely(collected_total == last_collected_total))
-                    rd->collector.calculated_value = 0;
-                else
-                    rd->collector.calculated_value =
-                            (NETDATA_DOUBLE)100
-                            * (NETDATA_DOUBLE)(rd->collector.collected_value - rd->collector.last_collected_value)
-                            / (NETDATA_DOUBLE)(collected_total - last_collected_total);
-
-                rrdset_debug(st, "%s: CALC PCENT-DIFF " NETDATA_DOUBLE_FORMAT " = 100"
-                            " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
-                            " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
-                          , rrddim_name(rd)
-                          , rd->collector.calculated_value
-                          , rd->collector.collected_value, rd->collector.last_collected_value
-                          , collected_total, last_collected_total
-                );
-                break;
-
-            default:
-                // make the default zero, to make sure
-                // it gets noticed when we add new types
-                rd->collector.calculated_value = 0;
-
-                rrdset_debug(st, "%s: CALC " NETDATA_DOUBLE_FORMAT " = 0"
-                          , rrddim_name(rd)
-                          , rd->collector.calculated_value
-                );
-                break;
-        }
-
-        rrdset_debug(st, "%s: PHASE2 "
-                    " last_collected_value = " COLLECTED_NUMBER_FORMAT
-                    " collected_value = " COLLECTED_NUMBER_FORMAT
-                    " last_calculated_value = " NETDATA_DOUBLE_FORMAT
-                    " calculated_value = " NETDATA_DOUBLE_FORMAT
-                    , rrddim_name(rd)
-                    , rd->collector.last_collected_value
-                    , rd->collector.collected_value
-                    , rd->collector.last_calculated_value
-                    , rd->collector.calculated_value
-        );
-    }
-
-    // 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 && st->counter_done > 1)) {
-//         // this is collected in the same interpolation point
-//         rrdset_debug(st, "THIS IS IN THE SAME INTERPOLATION POINT");
-//         netdata_log_info("INTERNAL CHECK: host '%s', chart '%s' collection %zu is in the same interpolation point: short by %llu microseconds", st->rrdhost->hostname, rrdset_name(st), st->counter_done, next_store_ut - now_collect_ut);
-//     }
-// #endif
-
-    rrdset_done_interpolate(
-            &stream_buffer
-            , st
-            , rda_base
-            , rda_slots
-            , update_every_ut
-            , last_stored_ut
-            , next_store_ut
-            , last_collect_ut
-            , now_collect_ut
-            , store_this_entry
-            , has_reset_value
-    );
-
-    for(dim_id = 0, rda = rda_base ; dim_id < rda_slots ; ++dim_id, ++rda) {
-        rd = rda->rd;
-        if(unlikely(!rd)) continue;
-
-        if(unlikely(!rrddim_check_updated(rd)))
-            continue;
-
-        rrdset_debug(st, "%s: setting last_collected_value (old: " COLLECTED_NUMBER_FORMAT ") to last_collected_value (new: " COLLECTED_NUMBER_FORMAT ")", rrddim_name(rd), rd->collector.last_collected_value, rd->collector.collected_value);
-
-        rd->collector.last_collected_value = rd->collector.collected_value;
-
-        switch(rd->algorithm) {
-            case RRD_ALGORITHM_INCREMENTAL:
-                if(unlikely(!first_entry)) {
-                    rrdset_debug(st, "%s: setting last_calculated_value (old: " NETDATA_DOUBLE_FORMAT ") to "
-                                     "last_calculated_value (new: " NETDATA_DOUBLE_FORMAT ")"
-                        , rrddim_name(rd)
-                        , rd->collector.last_calculated_value + rd->collector.calculated_value
-                        , rd->collector.calculated_value);
-
-                    rd->collector.last_calculated_value += rd->collector.calculated_value;
-                }
-                else {
-                    rrdset_debug(st, "THIS IS THE FIRST POINT");
-                }
-                break;
-
-            case RRD_ALGORITHM_ABSOLUTE:
-            case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
-            case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
-                rrdset_debug(st, "%s: setting last_calculated_value (old: " NETDATA_DOUBLE_FORMAT ") to "
-                                 "last_calculated_value (new: " NETDATA_DOUBLE_FORMAT ")"
-                    , rrddim_name(rd)
-                    , rd->collector.last_calculated_value
-                    , rd->collector.calculated_value);
-
-                rd->collector.last_calculated_value = rd->collector.calculated_value;
-                break;
-        }
-
-        rd->collector.calculated_value = 0;
-        rd->collector.collected_value = 0;
-        rrddim_clear_updated(rd);
-
-        rrdset_debug(st, "%s: END "
-                    " last_collected_value = " COLLECTED_NUMBER_FORMAT
-                    " collected_value = " COLLECTED_NUMBER_FORMAT
-                    " last_calculated_value = " NETDATA_DOUBLE_FORMAT
-                    " calculated_value = " NETDATA_DOUBLE_FORMAT
-                    , rrddim_name(rd)
-                    , rd->collector.last_collected_value
-                    , rd->collector.collected_value
-                    , rd->collector.last_calculated_value
-                    , rd->collector.calculated_value
-        );
-    }
-
-    spinlock_unlock(&st->data_collection_lock);
-    rrdset_push_metrics_finished(&stream_buffer, st);
-
-    // ALL DONE ABOUT THE DATA UPDATE
-    // --------------------------------------------------------------------
-
-    if(unlikely(st->rrd_memory_mode == RRD_MEMORY_MODE_MAP)) {
-        // update the memory mapped files with the latest values
-
-        rrdset_memory_file_update(st);
-
-        for(dim_id = 0, rda = rda_base; dim_id < rda_slots ; ++dim_id, ++rda) {
-            rd = rda->rd;
-            if(unlikely(!rd)) continue;
-            rrddim_memory_file_update(rd);
-        }
-    }
-
-    for(dim_id = 0, rda = rda_base; dim_id < rda_slots ; ++dim_id, ++rda) {
-        rd = rda->rd;
-        if(unlikely(!rd)) continue;
-
-        dictionary_acquired_item_release(st->rrddim_root_index, rda->item);
-        rda->item = NULL;
-        rda->rd = NULL;
-    }
-
-    rrdcontext_collected_rrdset(st);
-
-    store_metric_collection_completed();
-}
-
-time_t rrdset_set_update_every_s(RRDSET *st, time_t update_every_s) {
-    if(unlikely(update_every_s == st->update_every))
-        return st->update_every;
-
-    internal_error(true, "RRDSET '%s' switching update every from %d to %d",
-                   rrdset_id(st), (int)st->update_every, (int)update_every_s);
-
-    time_t prev_update_every_s = (time_t) st->update_every;
-    st->update_every = (int) update_every_s;
-
-    // switch update every to the storage engine
-    RRDDIM *rd;
-    rrddim_foreach_read(rd, st) {
-        for (size_t tier = 0; tier < storage_tiers; tier++) {
-            if (rd->tiers[tier].db_collection_handle)
-                storage_engine_store_change_collection_frequency(
-                        rd->tiers[tier].db_collection_handle,
-                        (int)(st->rrdhost->db[tier].tier_grouping * st->update_every));
-        }
-    }
-    rrddim_foreach_done(rd);
-
-    return prev_update_every_s;
-}
-
-// ----------------------------------------------------------------------------
-// compatibility layer for RRDSET files v019
-
-#define RRDSET_MAGIC_V019 "NETDATA RRD SET FILE V019"
-#define RRD_ID_LENGTH_MAX_V019 200
-
-struct avl_element_v019 {
-    void *avl_link[2];
-    signed char avl_balance;
-};
-struct avl_tree_type_v019 {
-    void *root;
-    int (*compar)(void *a, void *b);
-};
-struct avl_tree_lock_v019 {
-    struct avl_tree_type_v019 avl_tree;
-    pthread_rwlock_t rwlock;
-};
-struct rrdset_map_save_v019 {
-    struct avl_element_v019 avl;                    // ignored
-    struct avl_element_v019 avlname;                // ignored
-    char id[RRD_ID_LENGTH_MAX_V019 + 1];            // check to reset all - update on load
-    void *name;                                     // ignored
-    void *unused_ptr;                               // ignored
-    void *type;                                     // ignored
-    void *family;                                   // ignored
-    void *title;                                    // ignored
-    void *units;                                    // ignored
-    void *context;                                  // ignored
-    uint32_t hash_context;                          // ignored
-    uint32_t chart_type;                            // ignored
-    int update_every;                               // check to reset all - update on load
-    long entries;                                   // check to reset all - update on load
-    long current_entry;                             // NEEDS TO BE UPDATED - FIXED ON LOAD
-    uint32_t flags;                                 // ignored
-    void *exporting_flags;                          // ignored
-    int gap_when_lost_iterations_above;             // ignored
-    long priority;                                  // ignored
-    uint32_t rrd_memory_mode;                       // ignored
-    void *cache_dir;                                // ignored
-    char cache_filename[FILENAME_MAX+1];            // ignored - update on load
-    pthread_rwlock_t rrdset_rwlock;                 // ignored
-    size_t counter;                                 // NEEDS TO BE UPDATED - maintained on load
-    size_t counter_done;                            // ignored
-    union {                                         //
-        time_t last_accessed_time_s;                // ignored
-        time_t last_entry_s;                        // ignored
-    };                                              //
-    time_t upstream_resync_time;                    // ignored
-    void *plugin_name;                              // ignored
-    void *module_name;                              // ignored
-    void *chart_uuid;                               // ignored
-    void *state;                                    // ignored
-    size_t unused[3];                               // ignored
-    size_t rrddim_page_alignment;                   // ignored
-    uint32_t hash;                                  // ignored
-    uint32_t hash_name;                             // ignored
-    usec_t usec_since_last_update;                  // NEEDS TO BE UPDATED - maintained on load
-    struct timeval last_updated;                    // NEEDS TO BE UPDATED - check to reset all - fixed on load
-    struct timeval last_collected_time;             // ignored
-    long long collected_total;                      // ignored
-    long long last_collected_total;                 // ignored
-    void *rrdfamily;                                // ignored
-    void *rrdhost;                                  // ignored
-    void *next;                                     // ignored
-    long double green;                              // ignored
-    long double red;                                // ignored
-    struct avl_tree_lock_v019 rrdvar_root_index;    // ignored
-    void *variables;                                // ignored
-    void *alarms;                                   // ignored
-    unsigned long memsize;                          // check to reset all - update on load
-    char magic[sizeof(RRDSET_MAGIC_V019) + 1];      // check to reset all - update on load
-    struct avl_tree_lock_v019 dimensions_index;     // ignored
-    void *dimensions;                               // ignored
-};
-
-void rrdset_memory_file_update(RRDSET *st) {
-    if(!st->db.st_on_file) return;
-    struct rrdset_map_save_v019 *st_on_file = st->db.st_on_file;
-
-    st_on_file->current_entry = st->db.current_entry;
-    st_on_file->counter = st->counter;
-    st_on_file->usec_since_last_update = st->usec_since_last_update;
-    st_on_file->last_updated.tv_sec = st->last_updated.tv_sec;
-    st_on_file->last_updated.tv_usec = st->last_updated.tv_usec;
-}
-
-const char *rrdset_cache_filename(RRDSET *st) {
-    if(!st->db.st_on_file) return NULL;
-    struct rrdset_map_save_v019 *st_on_file = st->db.st_on_file;
-    return st_on_file->cache_filename;
-}
-
-const char *rrdset_cache_dir(RRDSET *st) {
-    if(!st->db.cache_dir)
-        st->db.cache_dir = rrdhost_cache_dir_for_rrdset_alloc(st->rrdhost, rrdset_id(st));
-
-    return st->db.cache_dir;
-}
-
-void rrdset_memory_file_free(RRDSET *st) {
-    if(!st->db.st_on_file) return;
-
-    // needed for memory mode map, to save the latest state
-    rrdset_memory_file_update(st);
-
-    struct rrdset_map_save_v019 *st_on_file = st->db.st_on_file;
-    __atomic_sub_fetch(&rrddim_db_memory_size, st_on_file->memsize, __ATOMIC_RELAXED);
-    netdata_munmap(st_on_file, st_on_file->memsize);
-
-    // remove the pointers from the RRDDIM
-    st->db.st_on_file = NULL;
-}
-
-void rrdset_memory_file_save(RRDSET *st) {
-    if(!st->db.st_on_file) return;
-
-    rrdset_memory_file_update(st);
-
-    struct rrdset_map_save_v019 *st_on_file = st->db.st_on_file;
-    if(st_on_file->rrd_memory_mode != RRD_MEMORY_MODE_SAVE) return;
-
-    memory_file_save(st_on_file->cache_filename, st->db.st_on_file, st_on_file->memsize);
-}
-
-bool rrdset_memory_load_or_create_map_save(RRDSET *st, RRD_MEMORY_MODE memory_mode) {
-    if(memory_mode != RRD_MEMORY_MODE_SAVE && memory_mode != RRD_MEMORY_MODE_MAP)
-        return false;
-
-    char fullfilename[FILENAME_MAX + 1];
-    snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", rrdset_cache_dir(st));
-
-    unsigned long size = sizeof(struct rrdset_map_save_v019);
-    struct rrdset_map_save_v019 *st_on_file = (struct rrdset_map_save_v019 *)netdata_mmap(
-        fullfilename, size, ((memory_mode == RRD_MEMORY_MODE_MAP) ? MAP_SHARED : MAP_PRIVATE), 0, false, NULL);
-
-    if(!st_on_file) return false;
-
-    time_t now_s = now_realtime_sec();
-
-    st_on_file->magic[sizeof(RRDSET_MAGIC_V019)] = '\0';
-    if(strcmp(st_on_file->magic, RRDSET_MAGIC_V019) != 0) {
-        netdata_log_info("Initializing file '%s'.", fullfilename);
-        memset(st_on_file, 0, size);
-    }
-    else if(strncmp(st_on_file->id, rrdset_id(st), RRD_ID_LENGTH_MAX_V019) != 0) {
-        netdata_log_error("File '%s' contents are not for chart '%s'. Clearing it.", fullfilename, rrdset_id(st));
-        memset(st_on_file, 0, size);
-    }
-    else if(st_on_file->memsize != size || st_on_file->entries != st->db.entries) {
-        netdata_log_error("File '%s' does not have the desired size. Clearing it.", fullfilename);
-        memset(st_on_file, 0, size);
-    }
-    else if(st_on_file->update_every != st->update_every) {
-        netdata_log_error("File '%s' does not have the desired granularity. Clearing it.", fullfilename);
-        memset(st_on_file, 0, size);
-    }
-    else if((now_s - st_on_file->last_updated.tv_sec) > (long)st->update_every * (long)st->db.entries) {
-        netdata_log_info("File '%s' is too old. Clearing it.", fullfilename);
-        memset(st_on_file, 0, size);
-    }
-    else if(st_on_file->last_updated.tv_sec > now_s + st->update_every) {
-        netdata_log_error("File '%s' refers to the future by %zd secs. Resetting it to now.", fullfilename, (ssize_t)(st_on_file->last_updated.tv_sec - now_s));
-        st_on_file->last_updated.tv_sec = now_s;
-    }
-
-    if(st_on_file->current_entry >= st_on_file->entries)
-        st_on_file->current_entry = 0;
-
-    // make sure the database is aligned
-    bool align_last_updated = false;
-    if(st_on_file->last_updated.tv_sec) {
-        st_on_file->update_every = st->update_every;
-        align_last_updated = true;
-    }
-
-    // copy the useful values to st
-    st->db.current_entry = st_on_file->current_entry;
-    st->counter = st_on_file->counter;
-    st->usec_since_last_update = st_on_file->usec_since_last_update;
-    st->last_updated.tv_sec = st_on_file->last_updated.tv_sec;
-    st->last_updated.tv_usec = st_on_file->last_updated.tv_usec;
-
-    // link it to st
-    st->db.st_on_file = st_on_file;
-
-    // clear everything
-    memset(st_on_file, 0, size);
-
-    // set the values we need
-    strncpyz(st_on_file->id, rrdset_id(st), RRD_ID_LENGTH_MAX_V019);
-    strcpy(st_on_file->cache_filename, fullfilename);
-    strcpy(st_on_file->magic, RRDSET_MAGIC_V019);
-    st_on_file->memsize = size;
-    st_on_file->entries = st->db.entries;
-    st_on_file->update_every = st->update_every;
-    st_on_file->rrd_memory_mode = memory_mode;
-
-    if(align_last_updated)
-        last_updated_time_align(st);
-
-    // copy the useful values back to st_on_file
-    rrdset_memory_file_update(st);
-
-    __atomic_add_fetch(&rrddim_db_memory_size, st_on_file->memsize, __ATOMIC_RELAXED);
-    return true;
-}