Adding upstream version 1.29.3.upstream/1.29.3upstream

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

1 files changed, 1606 insertions, 0 deletions

diff --git a/database/rrdhost.c b/database/rrdhost.c
new file mode 100644
index 0000000..45c3146
--- /dev/null
+++ b/database/rrdhost.c
@@ -0,0 +1,1606 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define NETDATA_RRD_INTERNALS
+#include "rrd.h"
+
+RRDHOST *localhost = NULL;
+size_t rrd_hosts_available = 0;
+netdata_rwlock_t rrd_rwlock = NETDATA_RWLOCK_INITIALIZER;
+
+time_t rrdset_free_obsolete_time = 3600;
+time_t rrdhost_free_orphan_time = 3600;
+
+// ----------------------------------------------------------------------------
+// RRDHOST index
+
+int rrdhost_compare(void* a, void* b) {
+    if(((RRDHOST *)a)->hash_machine_guid < ((RRDHOST *)b)->hash_machine_guid) return -1;
+    else if(((RRDHOST *)a)->hash_machine_guid > ((RRDHOST *)b)->hash_machine_guid) return 1;
+    else return strcmp(((RRDHOST *)a)->machine_guid, ((RRDHOST *)b)->machine_guid);
+}
+
+avl_tree_lock rrdhost_root_index = {
+        .avl_tree = { NULL, rrdhost_compare },
+        .rwlock = AVL_LOCK_INITIALIZER
+};
+
+RRDHOST *rrdhost_find_by_guid(const char *guid, uint32_t hash) {
+    debug(D_RRDHOST, "Searching in index for host with guid '%s'", guid);
+
+    RRDHOST tmp;
+    strncpyz(tmp.machine_guid, guid, GUID_LEN);
+    tmp.hash_machine_guid = (hash)?hash:simple_hash(tmp.machine_guid);
+
+    return (RRDHOST *)avl_search_lock(&(rrdhost_root_index), (avl *) &tmp);
+}
+
+RRDHOST *rrdhost_find_by_hostname(const char *hostname, uint32_t hash) {
+    if(unlikely(!strcmp(hostname, "localhost")))
+        return localhost;
+
+    if(unlikely(!hash)) hash = simple_hash(hostname);
+
+    rrd_rdlock();
+    RRDHOST *host;
+    rrdhost_foreach_read(host) {
+        if(unlikely((hash == host->hash_hostname && !strcmp(hostname, host->hostname)))) {
+            rrd_unlock();
+            return host;
+        }
+    }
+    rrd_unlock();
+
+    return NULL;
+}
+
+#define rrdhost_index_add(rrdhost) (RRDHOST *)avl_insert_lock(&(rrdhost_root_index), (avl *)(rrdhost))
+#define rrdhost_index_del(rrdhost) (RRDHOST *)avl_remove_lock(&(rrdhost_root_index), (avl *)(rrdhost))
+
+
+// ----------------------------------------------------------------------------
+// RRDHOST - internal helpers
+
+static inline void rrdhost_init_tags(RRDHOST *host, const char *tags) {
+    if(host->tags && tags && !strcmp(host->tags, tags))
+        return;
+
+    void *old = (void *)host->tags;
+    host->tags = (tags && *tags)?strdupz(tags):NULL;
+    freez(old);
+}
+
+static inline void rrdhost_init_hostname(RRDHOST *host, const char *hostname) {
+    if(host->hostname && hostname && !strcmp(host->hostname, hostname))
+        return;
+
+    void *old = host->hostname;
+    host->hostname = strdupz(hostname?hostname:"localhost");
+    host->hash_hostname = simple_hash(host->hostname);
+    freez(old);
+}
+
+static inline void rrdhost_init_os(RRDHOST *host, const char *os) {
+    if(host->os && os && !strcmp(host->os, os))
+        return;
+
+    void *old = (void *)host->os;
+    host->os = strdupz(os?os:"unknown");
+    freez(old);
+}
+
+static inline void rrdhost_init_timezone(RRDHOST *host, const char *timezone) {
+    if(host->timezone && timezone && !strcmp(host->timezone, timezone))
+        return;
+
+    void *old = (void *)host->timezone;
+    host->timezone = strdupz((timezone && *timezone)?timezone:"unknown");
+    freez(old);
+}
+
+static inline void rrdhost_init_machine_guid(RRDHOST *host, const char *machine_guid) {
+    strncpy(host->machine_guid, machine_guid, GUID_LEN);
+    host->machine_guid[GUID_LEN] = '\0';
+    host->hash_machine_guid = simple_hash(host->machine_guid);
+}
+
+void set_host_properties(RRDHOST *host, int update_every, RRD_MEMORY_MODE memory_mode, const char *hostname,
+                         const char *registry_hostname, const char *guid, const char *os, const char *tags,
+                         const char *tzone, const char *program_name, const char *program_version)
+{
+
+    host->rrd_update_every = update_every;
+    host->rrd_memory_mode = memory_mode;
+
+    rrdhost_init_hostname(host, hostname);
+
+    rrdhost_init_machine_guid(host, guid);
+
+    rrdhost_init_os(host, os);
+    rrdhost_init_timezone(host, tzone);
+    rrdhost_init_tags(host, tags);
+
+    host->program_name = strdupz((program_name && *program_name) ? program_name : "unknown");
+    host->program_version = strdupz((program_version && *program_version) ? program_version : "unknown");
+
+    host->registry_hostname = strdupz((registry_hostname && *registry_hostname) ? registry_hostname : host->hostname);
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - add a host
+
+RRDHOST *rrdhost_create(const char *hostname,
+                        const char *registry_hostname,
+                        const char *guid,
+                        const char *os,
+                        const char *timezone,
+                        const char *tags,
+                        const char *program_name,
+                        const char *program_version,
+                        int update_every,
+                        long entries,
+                        RRD_MEMORY_MODE memory_mode,
+                        unsigned int health_enabled,
+                        unsigned int rrdpush_enabled,
+                        char *rrdpush_destination,
+                        char *rrdpush_api_key,
+                        char *rrdpush_send_charts_matching,
+                        struct rrdhost_system_info *system_info,
+                        int is_localhost
+) {
+    debug(D_RRDHOST, "Host '%s': adding with guid '%s'", hostname, guid);
+
+#ifdef ENABLE_DBENGINE
+    int is_legacy = (memory_mode == RRD_MEMORY_MODE_DBENGINE) && is_legacy_child(guid);
+#else
+    int is_legacy = 1;
+#endif
+    rrd_check_wrlock();
+
+    int is_in_multihost = (memory_mode == RRD_MEMORY_MODE_DBENGINE && !is_legacy);
+    RRDHOST *host = callocz(1, sizeof(RRDHOST));
+
+    set_host_properties(host, (update_every > 0)?update_every:1, memory_mode, hostname, registry_hostname, guid, os,
+                        tags, timezone, program_name, program_version);
+
+    host->rrd_history_entries = align_entries_to_pagesize(memory_mode, entries);
+    host->health_enabled      = ((memory_mode == RRD_MEMORY_MODE_NONE)) ? 0 : health_enabled;
+
+    host->sender = mallocz(sizeof(*host->sender));
+    sender_init(host->sender, host);
+    netdata_mutex_init(&host->receiver_lock);
+
+    host->rrdpush_send_enabled     = (rrdpush_enabled && rrdpush_destination && *rrdpush_destination && rrdpush_api_key && *rrdpush_api_key) ? 1 : 0;
+    host->rrdpush_send_destination = (host->rrdpush_send_enabled)?strdupz(rrdpush_destination):NULL;
+    host->rrdpush_send_api_key     = (host->rrdpush_send_enabled)?strdupz(rrdpush_api_key):NULL;
+    host->rrdpush_send_charts_matching = simple_pattern_create(rrdpush_send_charts_matching, NULL, SIMPLE_PATTERN_EXACT);
+
+    host->rrdpush_sender_pipe[0] = -1;
+    host->rrdpush_sender_pipe[1] = -1;
+    host->rrdpush_sender_socket  = -1;
+
+    //host->stream_version = STREAMING_PROTOCOL_CURRENT_VERSION;        Unused?
+#ifdef ENABLE_HTTPS
+    host->ssl.conn = NULL;
+    host->ssl.flags = NETDATA_SSL_START;
+    host->stream_ssl.conn = NULL;
+    host->stream_ssl.flags = NETDATA_SSL_START;
+#endif
+
+    netdata_rwlock_init(&host->rrdhost_rwlock);
+    netdata_rwlock_init(&host->labels.labels_rwlock);
+
+    netdata_mutex_init(&host->aclk_state_lock);
+
+    host->system_info = system_info;
+
+    avl_init_lock(&(host->rrdset_root_index),      rrdset_compare);
+    avl_init_lock(&(host->rrdset_root_index_name), rrdset_compare_name);
+    avl_init_lock(&(host->rrdfamily_root_index),   rrdfamily_compare);
+    avl_init_lock(&(host->rrdvar_root_index),   rrdvar_compare);
+
+    if(config_get_boolean(CONFIG_SECTION_GLOBAL, "delete obsolete charts files", 1))
+        rrdhost_flag_set(host, RRDHOST_FLAG_DELETE_OBSOLETE_CHARTS);
+
+    if(config_get_boolean(CONFIG_SECTION_GLOBAL, "delete orphan hosts files", 1) && !is_localhost)
+        rrdhost_flag_set(host, RRDHOST_FLAG_DELETE_ORPHAN_HOST);
+
+    host->health_default_warn_repeat_every = config_get_duration(CONFIG_SECTION_HEALTH, "default repeat warning", "never");
+    host->health_default_crit_repeat_every = config_get_duration(CONFIG_SECTION_HEALTH, "default repeat critical", "never");
+    avl_init_lock(&(host->alarms_idx_health_log), alarm_compare_id);
+    avl_init_lock(&(host->alarms_idx_name), alarm_compare_name);
+
+    // ------------------------------------------------------------------------
+    // initialize health variables
+
+    host->health_log.next_log_id = 1;
+    host->health_log.next_alarm_id = 1;
+    host->health_log.max = 1000;
+    host->health_log.next_log_id = (uint32_t)now_realtime_sec();
+    host->health_log.next_alarm_id = 0;
+
+    long n = config_get_number(CONFIG_SECTION_HEALTH, "in memory max health log entries", host->health_log.max);
+    if(n < 10) {
+        error("Host '%s': health configuration has invalid max log entries %ld. Using default %u", host->hostname, n, host->health_log.max);
+        config_set_number(CONFIG_SECTION_HEALTH, "in memory max health log entries", (long)host->health_log.max);
+    }
+    else
+        host->health_log.max = (unsigned int)n;
+
+    netdata_rwlock_init(&host->health_log.alarm_log_rwlock);
+
+    char filename[FILENAME_MAX + 1];
+
+    if(is_localhost) {
+
+        host->cache_dir  = strdupz(netdata_configured_cache_dir);
+        host->varlib_dir = strdupz(netdata_configured_varlib_dir);
+
+    }
+    else {
+        // this is not localhost - append our GUID to localhost path
+        if (is_in_multihost) { // don't append to cache dir in multihost
+            host->cache_dir  = strdupz(netdata_configured_cache_dir);
+        } else {
+            snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_cache_dir, host->machine_guid);
+            host->cache_dir = strdupz(filename);
+        }
+
+        if((host->rrd_memory_mode == RRD_MEMORY_MODE_MAP || host->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || (
+           host->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE && is_legacy))) {
+            int r = mkdir(host->cache_dir, 0775);
+            if(r != 0 && errno != EEXIST)
+                error("Host '%s': cannot create directory '%s'", host->hostname, host->cache_dir);
+        }
+
+        snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_varlib_dir, host->machine_guid);
+        host->varlib_dir = strdupz(filename);
+
+        if(host->health_enabled) {
+            int r = mkdir(host->varlib_dir, 0775);
+            if(r != 0 && errno != EEXIST)
+                error("Host '%s': cannot create directory '%s'", host->hostname, host->varlib_dir);
+       }
+
+    }
+
+    if(host->health_enabled) {
+        snprintfz(filename, FILENAME_MAX, "%s/health", host->varlib_dir);
+        int r = mkdir(filename, 0775);
+        if(r != 0 && errno != EEXIST)
+            error("Host '%s': cannot create directory '%s'", host->hostname, filename);
+    }
+
+    snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", host->varlib_dir);
+    host->health_log_filename = strdupz(filename);
+
+    snprintfz(filename, FILENAME_MAX, "%s/alarm-notify.sh", netdata_configured_primary_plugins_dir);
+    host->health_default_exec = strdupz(config_get(CONFIG_SECTION_HEALTH, "script to execute on alarm", filename));
+    host->health_default_recipient = strdupz("root");
+
+
+    // ------------------------------------------------------------------------
+    // load health configuration
+
+    if(host->health_enabled) {
+        rrdhost_wrlock(host);
+        health_readdir(host, health_user_config_dir(), health_stock_config_dir(), NULL);
+        rrdhost_unlock(host);
+
+        health_alarm_log_load(host);
+        health_alarm_log_open(host);
+    }
+
+    RRDHOST *t = rrdhost_index_add(host);
+
+    if(t != host) {
+        error("Host '%s': cannot add host with machine guid '%s' to index. It already exists as host '%s' with machine guid '%s'.", host->hostname, host->machine_guid, t->hostname, t->machine_guid);
+        rrdhost_free(host);
+        return NULL;
+    }
+
+    if (host->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE) {
+#ifdef ENABLE_DBENGINE
+        if (likely(!uuid_parse(host->machine_guid, host->host_uuid))) {
+            int rc = sql_store_host(&host->host_uuid, hostname, registry_hostname, update_every, os, timezone, tags);
+            if (unlikely(rc))
+                error_report("Failed to store machine GUID to the database");
+        }
+        else
+            error_report("Host machine GUID %s is not valid", host->machine_guid);
+        char dbenginepath[FILENAME_MAX + 1];
+        int ret;
+
+        snprintfz(dbenginepath, FILENAME_MAX, "%s/dbengine", host->cache_dir);
+        ret = mkdir(dbenginepath, 0775);
+        if (ret != 0 && errno != EEXIST)
+            error("Host '%s': cannot create directory '%s'", host->hostname, dbenginepath);
+        else ret = 0; // succeed
+        if (is_legacy) // initialize legacy dbengine instance as needed
+            ret = rrdeng_init(host, &host->rrdeng_ctx, dbenginepath, default_rrdeng_page_cache_mb,
+                              default_rrdeng_disk_quota_mb); // may fail here for legacy dbengine initialization
+        else
+            host->rrdeng_ctx = &multidb_ctx;
+        if (ret) { // check legacy or multihost initialization success
+            error(
+                "Host '%s': cannot initialize host with machine guid '%s'. Failed to initialize DB engine at '%s'.",
+                host->hostname, host->machine_guid, host->cache_dir);
+            rrdhost_free(host);
+            host = NULL;
+            //rrd_hosts_available++; //TODO: maybe we want this?
+
+            return host;
+        }
+
+#else
+        fatal("RRD_MEMORY_MODE_DBENGINE is not supported in this platform.");
+#endif
+    }
+
+    // ------------------------------------------------------------------------
+    // link it and add it to the index
+
+    if(is_localhost) {
+        host->next = localhost;
+        localhost = host;
+    }
+    else {
+        if(localhost) {
+            host->next = localhost->next;
+            localhost->next = host;
+        }
+        else localhost = host;
+    }
+
+    info("Host '%s' (at registry as '%s') with guid '%s' initialized"
+                 ", os '%s'"
+                 ", timezone '%s'"
+                 ", tags '%s'"
+                 ", program_name '%s'"
+                 ", program_version '%s'"
+                 ", update every %d"
+                 ", memory mode %s"
+                 ", history entries %ld"
+                 ", streaming %s"
+                 " (to '%s' with api key '%s')"
+                 ", health %s"
+                 ", cache_dir '%s'"
+                 ", varlib_dir '%s'"
+                 ", health_log '%s'"
+                 ", alarms default handler '%s'"
+                 ", alarms default recipient '%s'"
+         , host->hostname
+         , host->registry_hostname
+         , host->machine_guid
+         , host->os
+         , host->timezone
+         , (host->tags)?host->tags:""
+         , host->program_name
+         , host->program_version
+         , host->rrd_update_every
+         , rrd_memory_mode_name(host->rrd_memory_mode)
+         , host->rrd_history_entries
+         , host->rrdpush_send_enabled?"enabled":"disabled"
+         , host->rrdpush_send_destination?host->rrdpush_send_destination:""
+         , host->rrdpush_send_api_key?host->rrdpush_send_api_key:""
+         , host->health_enabled?"enabled":"disabled"
+         , host->cache_dir
+         , host->varlib_dir
+         , host->health_log_filename
+         , host->health_default_exec
+         , host->health_default_recipient
+    );
+
+    rrd_hosts_available++;
+
+    return host;
+}
+
+void rrdhost_update(RRDHOST *host
+                    , const char *hostname
+                    , const char *registry_hostname
+                    , const char *guid
+                    , const char *os
+                    , const char *timezone
+                    , const char *tags
+                    , const char *program_name
+                    , const char *program_version
+                    , int update_every
+                    , long history
+                    , RRD_MEMORY_MODE mode
+                    , unsigned int health_enabled
+                    , unsigned int rrdpush_enabled
+                    , char *rrdpush_destination
+                    , char *rrdpush_api_key
+                    , char *rrdpush_send_charts_matching
+                    , struct rrdhost_system_info *system_info
+)
+{
+    UNUSED(guid);
+    UNUSED(rrdpush_enabled);
+    UNUSED(rrdpush_destination);
+    UNUSED(rrdpush_api_key);
+    UNUSED(rrdpush_send_charts_matching);
+
+    host->health_enabled = (mode == RRD_MEMORY_MODE_NONE) ? 0 : health_enabled;
+    //host->stream_version = STREAMING_PROTOCOL_CURRENT_VERSION;        Unused?
+
+    rrdhost_system_info_free(host->system_info);
+    host->system_info = system_info;
+
+    rrdhost_init_os(host, os);
+    rrdhost_init_timezone(host, timezone);
+
+    freez(host->registry_hostname);
+    host->registry_hostname = strdupz((registry_hostname && *registry_hostname)?registry_hostname:hostname);
+
+    if(strcmp(host->hostname, hostname) != 0) {
+        info("Host '%s' has been renamed to '%s'. If this is not intentional it may mean multiple hosts are using the same machine_guid.", host->hostname, hostname);
+        char *t = host->hostname;
+        host->hostname = strdupz(hostname);
+        host->hash_hostname = simple_hash(host->hostname);
+        freez(t);
+    }
+
+    if(strcmp(host->program_name, program_name) != 0) {
+        info("Host '%s' switched program name from '%s' to '%s'", host->hostname, host->program_name, program_name);
+        char *t = host->program_name;
+        host->program_name = strdupz(program_name);
+        freez(t);
+    }
+
+    if(strcmp(host->program_version, program_version) != 0) {
+        info("Host '%s' switched program version from '%s' to '%s'", host->hostname, host->program_version, program_version);
+        char *t = host->program_version;
+        host->program_version = strdupz(program_version);
+        freez(t);
+    }
+
+    if(host->rrd_update_every != update_every)
+        error("Host '%s' has an update frequency of %d seconds, but the wanted one is %d seconds. Restart netdata here to apply the new settings.", host->hostname, host->rrd_update_every, update_every);
+
+    if(host->rrd_history_entries < history)
+        error("Host '%s' has history of %ld entries, but the wanted one is %ld entries. Restart netdata here to apply the new settings.", host->hostname, host->rrd_history_entries, history);
+
+    if(host->rrd_memory_mode != mode)
+        error("Host '%s' has memory mode '%s', but the wanted one is '%s'. Restart netdata here to apply the new settings.", host->hostname, rrd_memory_mode_name(host->rrd_memory_mode), rrd_memory_mode_name(mode));
+
+    // update host tags
+    rrdhost_init_tags(host, tags);
+
+    if (rrdhost_flag_check(host, RRDHOST_FLAG_ARCHIVED)) {
+        rrdhost_flag_clear(host, RRDHOST_FLAG_ARCHIVED);
+        if(host->health_enabled) {
+            int r;
+            char filename[FILENAME_MAX + 1];
+
+            if (host != localhost) {
+                r = mkdir(host->varlib_dir, 0775);
+                if (r != 0 && errno != EEXIST)
+                    error("Host '%s': cannot create directory '%s'", host->hostname, host->varlib_dir);
+            }
+            snprintfz(filename, FILENAME_MAX, "%s/health", host->varlib_dir);
+            r = mkdir(filename, 0775);
+            if(r != 0 && errno != EEXIST)
+                error("Host '%s': cannot create directory '%s'", host->hostname, filename);
+
+            rrdhost_wrlock(host);
+            health_readdir(host, health_user_config_dir(), health_stock_config_dir(), NULL);
+            rrdhost_unlock(host);
+
+            health_alarm_log_load(host);
+            health_alarm_log_open(host);
+        }
+        rrd_hosts_available++;
+        info("Host %s is not in archived mode anymore", host->hostname);
+    }
+
+    return;
+}
+
+RRDHOST *rrdhost_find_or_create(
+          const char *hostname
+        , const char *registry_hostname
+        , const char *guid
+        , const char *os
+        , const char *timezone
+        , const char *tags
+        , const char *program_name
+        , const char *program_version
+        , int update_every
+        , long history
+        , RRD_MEMORY_MODE mode
+        , unsigned int health_enabled
+        , unsigned int rrdpush_enabled
+        , char *rrdpush_destination
+        , char *rrdpush_api_key
+        , char *rrdpush_send_charts_matching
+        , struct rrdhost_system_info *system_info
+) {
+    debug(D_RRDHOST, "Searching for host '%s' with guid '%s'", hostname, guid);
+
+    rrd_wrlock();
+    RRDHOST *host = rrdhost_find_by_guid(guid, 0);
+    if (unlikely(host && RRD_MEMORY_MODE_DBENGINE != mode && rrdhost_flag_check(host, RRDHOST_FLAG_ARCHIVED))) {
+        /* If a legacy memory mode instantiates all dbengine state must be discarded to avoid inconsistencies */
+        error("Archived host '%s' has memory mode '%s', but the wanted one is '%s'. Discarding archived state.",
+              host->hostname, rrd_memory_mode_name(host->rrd_memory_mode), rrd_memory_mode_name(mode));
+        rrdhost_free(host);
+        host = NULL;
+    }
+    if(!host) {
+        host = rrdhost_create(
+                hostname
+                , registry_hostname
+                , guid
+                , os
+                , timezone
+                , tags
+                , program_name
+                , program_version
+                , update_every
+                , history
+                , mode
+                , health_enabled
+                , rrdpush_enabled
+                , rrdpush_destination
+                , rrdpush_api_key
+                , rrdpush_send_charts_matching
+                , system_info
+                , 0
+        );
+    }
+    else {
+        rrdhost_update(host
+           , hostname
+           , registry_hostname
+           , guid
+           , os
+           , timezone
+           , tags
+           , program_name
+           , program_version
+           , update_every
+           , history
+           , mode
+           , health_enabled
+           , rrdpush_enabled
+           , rrdpush_destination
+           , rrdpush_api_key
+           , rrdpush_send_charts_matching
+           , system_info);
+    }
+    if (host) {
+        rrdhost_wrlock(host);
+        rrdhost_flag_clear(host, RRDHOST_FLAG_ORPHAN);
+        host->senders_disconnected_time = 0;
+        rrdhost_unlock(host);
+    }
+
+    rrdhost_cleanup_orphan_hosts_nolock(host);
+
+    rrd_unlock();
+
+    return host;
+}
+inline int rrdhost_should_be_removed(RRDHOST *host, RRDHOST *protected, time_t now) {
+    if(host != protected
+       && host != localhost
+       && rrdhost_flag_check(host, RRDHOST_FLAG_ORPHAN)
+       && host->receiver
+       && host->senders_disconnected_time
+       && host->senders_disconnected_time + rrdhost_free_orphan_time < now)
+        return 1;
+
+    return 0;
+}
+
+void rrdhost_cleanup_orphan_hosts_nolock(RRDHOST *protected) {
+    time_t now = now_realtime_sec();
+
+    RRDHOST *host;
+
+restart_after_removal:
+    rrdhost_foreach_write(host) {
+        if(rrdhost_should_be_removed(host, protected, now)) {
+            info("Host '%s' with machine guid '%s' is obsolete - cleaning up.", host->hostname, host->machine_guid);
+
+            if (rrdhost_flag_check(host, RRDHOST_FLAG_DELETE_ORPHAN_HOST)
+#ifdef ENABLE_DBENGINE
+                /* don't delete multi-host DB host files */
+                && !(host->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE && host->rrdeng_ctx == &multidb_ctx)
+#endif
+            )
+                rrdhost_delete_charts(host);
+            else
+                rrdhost_save_charts(host);
+
+            rrdhost_free(host);
+            goto restart_after_removal;
+        }
+    }
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST global / startup initialization
+
+int rrd_init(char *hostname, struct rrdhost_system_info *system_info) {
+    rrdset_free_obsolete_time = config_get_number(CONFIG_SECTION_GLOBAL, "cleanup obsolete charts after seconds", rrdset_free_obsolete_time);
+    gap_when_lost_iterations_above = (int)config_get_number(CONFIG_SECTION_GLOBAL, "gap when lost iterations above", gap_when_lost_iterations_above);
+    if (gap_when_lost_iterations_above < 1)
+        gap_when_lost_iterations_above = 1;
+
+#ifdef ENABLE_DBENGINE
+    if (unlikely(sql_init_database())) {
+        return 1;
+    }
+#endif
+
+    health_init();
+
+    rrdpush_init();
+
+    debug(D_RRDHOST, "Initializing localhost with hostname '%s'", hostname);
+    rrd_wrlock();
+    localhost = rrdhost_create(
+            hostname
+            , registry_get_this_machine_hostname()
+            , registry_get_this_machine_guid()
+            , os_type
+            , netdata_configured_timezone
+            , config_get(CONFIG_SECTION_BACKEND, "host tags", "")
+            , program_name
+            , program_version
+            , default_rrd_update_every
+            , default_rrd_history_entries
+            , default_rrd_memory_mode
+            , default_health_enabled
+            , default_rrdpush_enabled
+            , default_rrdpush_destination
+            , default_rrdpush_api_key
+            , default_rrdpush_send_charts_matching
+            , system_info
+            , 1
+    );
+    if (unlikely(!localhost)) {
+        rrd_unlock();
+        return 1;
+    }
+
+#ifdef ENABLE_DBENGINE
+    char dbenginepath[FILENAME_MAX + 1];
+    int ret;
+    snprintfz(dbenginepath, FILENAME_MAX, "%s/dbengine", localhost->cache_dir);
+    ret = mkdir(dbenginepath, 0775);
+    if (ret != 0 && errno != EEXIST)
+        error("Host '%s': cannot create directory '%s'", localhost->hostname, dbenginepath);
+    else  // Unconditionally create multihost db to support on demand host creation
+        ret = rrdeng_init(NULL, NULL, dbenginepath, default_rrdeng_page_cache_mb, default_multidb_disk_quota_mb);
+    if (ret) {
+        error(
+            "Host '%s' with machine guid '%s' failed to initialize multi-host DB engine instance at '%s'.",
+            localhost->hostname, localhost->machine_guid, localhost->cache_dir);
+        rrdhost_free(localhost);
+        localhost = NULL;
+        rrd_unlock();
+        return 1;
+    }
+#endif
+    rrd_unlock();
+
+    web_client_api_v1_management_init();
+    return localhost==NULL;
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - lock validations
+// there are only used when NETDATA_INTERNAL_CHECKS is set
+
+void __rrdhost_check_rdlock(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
+    debug(D_RRDHOST, "Checking read lock on host '%s'", host->hostname);
+
+    int ret = netdata_rwlock_trywrlock(&host->rrdhost_rwlock);
+    if(ret == 0)
+        fatal("RRDHOST '%s' should be read-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
+}
+
+void __rrdhost_check_wrlock(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
+    debug(D_RRDHOST, "Checking write lock on host '%s'", host->hostname);
+
+    int ret = netdata_rwlock_tryrdlock(&host->rrdhost_rwlock);
+    if(ret == 0)
+        fatal("RRDHOST '%s' should be write-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
+}
+
+void __rrd_check_rdlock(const char *file, const char *function, const unsigned long line) {
+    debug(D_RRDHOST, "Checking read lock on all RRDs");
+
+    int ret = netdata_rwlock_trywrlock(&rrd_rwlock);
+    if(ret == 0)
+        fatal("RRDs should be read-locked, but it are not, at function %s() at line %lu of file '%s'", function, line, file);
+}
+
+void __rrd_check_wrlock(const char *file, const char *function, const unsigned long line) {
+    debug(D_RRDHOST, "Checking write lock on all RRDs");
+
+    int ret = netdata_rwlock_tryrdlock(&rrd_rwlock);
+    if(ret == 0)
+        fatal("RRDs should be write-locked, but it are not, at function %s() at line %lu of file '%s'", function, line, file);
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - free
+
+void rrdhost_system_info_free(struct rrdhost_system_info *system_info) {
+    info("SYSTEM_INFO: free %p", system_info);
+
+    if(likely(system_info)) {
+        freez(system_info->host_os_name);
+        freez(system_info->host_os_id);
+        freez(system_info->host_os_id_like);
+        freez(system_info->host_os_version);
+        freez(system_info->host_os_version_id);
+        freez(system_info->host_os_detection);
+        freez(system_info->host_cores);
+        freez(system_info->host_cpu_freq);
+        freez(system_info->host_ram_total);
+        freez(system_info->host_disk_space);
+        freez(system_info->container_os_name);
+        freez(system_info->container_os_id);
+        freez(system_info->container_os_id_like);
+        freez(system_info->container_os_version);
+        freez(system_info->container_os_version_id);
+        freez(system_info->container_os_detection);
+        freez(system_info->kernel_name);
+        freez(system_info->kernel_version);
+        freez(system_info->architecture);
+        freez(system_info->virtualization);
+        freez(system_info->virt_detection);
+        freez(system_info->container);
+        freez(system_info->container_detection);
+        freez(system_info->is_k8s_node);
+        freez(system_info);
+    }
+}
+
+void destroy_receiver_state(struct receiver_state *rpt);
+void rrdhost_free(RRDHOST *host) {
+    if(!host) return;
+
+    info("Freeing all memory for host '%s'...", host->hostname);
+
+    rrd_check_wrlock();     // make sure the RRDs are write locked
+
+    // ------------------------------------------------------------------------
+    // clean up streaming
+    rrdpush_sender_thread_stop(host); // stop a possibly running thread
+    cbuffer_free(host->sender->buffer);
+    buffer_free(host->sender->build);
+    freez(host->sender);
+    host->sender = NULL;
+    if (netdata_exit) {
+        netdata_mutex_lock(&host->receiver_lock);
+        if (host->receiver) {
+            if (!host->receiver->exited)
+                netdata_thread_cancel(host->receiver->thread);
+            netdata_mutex_unlock(&host->receiver_lock);
+            struct receiver_state *rpt = host->receiver;
+            while (host->receiver && !rpt->exited)
+                sleep_usec(50 * USEC_PER_MS);
+            // If the receiver detached from the host then its thread will destroy the state
+            if (host->receiver == rpt)
+                destroy_receiver_state(host->receiver);
+        }
+        else
+            netdata_mutex_unlock(&host->receiver_lock);
+    }
+
+
+
+    rrdhost_wrlock(host);   // lock this RRDHOST
+
+    // ------------------------------------------------------------------------
+    // release its children resources
+
+#ifdef ENABLE_DBENGINE
+    if (host->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE) {
+        if (host->rrdeng_ctx != &multidb_ctx)
+            rrdeng_prepare_exit(host->rrdeng_ctx);
+    }
+#endif
+    while(host->rrdset_root)
+        rrdset_free(host->rrdset_root);
+
+    freez(host->exporting_flags);
+
+    while(host->alarms)
+        rrdcalc_unlink_and_free(host, host->alarms);
+
+    RRDCALC *rc,*nc;
+    for(rc = host->alarms_with_foreach; rc ; rc = nc) {
+        nc = rc->next;
+        rrdcalc_free(rc);
+    }
+    host->alarms_with_foreach = NULL;
+
+    while(host->templates)
+        rrdcalctemplate_unlink_and_free(host, host->templates);
+
+    RRDCALCTEMPLATE *rt,*next;
+    for(rt = host->alarms_template_with_foreach; rt ; rt = next) {
+        next = rt->next;
+        rrdcalctemplate_free(rt);
+    }
+    host->alarms_template_with_foreach = NULL;
+
+    debug(D_RRD_CALLS, "RRDHOST: Cleaning up remaining host variables for host '%s'", host->hostname);
+    rrdvar_free_remaining_variables(host, &host->rrdvar_root_index);
+
+    health_alarm_log_free(host);
+
+#ifdef ENABLE_DBENGINE
+    if (host->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE && host->rrdeng_ctx != &multidb_ctx)
+        rrdeng_exit(host->rrdeng_ctx);
+#endif
+
+    // ------------------------------------------------------------------------
+    // remove it from the indexes
+
+    if(rrdhost_index_del(host) != host)
+        error("RRDHOST '%s' removed from index, deleted the wrong entry.", host->hostname);
+
+
+    // ------------------------------------------------------------------------
+    // unlink it from the host
+
+    if(host == localhost) {
+        localhost = host->next;
+    }
+    else {
+        // find the previous one
+        RRDHOST *h;
+        for(h = localhost; h && h->next != host ; h = h->next) ;
+
+        // bypass it
+        if(h) h->next = host->next;
+        else error("Request to free RRDHOST '%s': cannot find it", host->hostname);
+    }
+
+
+
+    // ------------------------------------------------------------------------
+    // free it
+
+    pthread_mutex_destroy(&host->aclk_state_lock);
+    freez(host->aclk_state.claimed_id);
+    freez((void *)host->tags);
+    free_label_list(host->labels.head);
+    freez((void *)host->os);
+    freez((void *)host->timezone);
+    freez(host->program_version);
+    freez(host->program_name);
+    rrdhost_system_info_free(host->system_info);
+    freez(host->cache_dir);
+    freez(host->varlib_dir);
+    freez(host->rrdpush_send_api_key);
+    freez(host->rrdpush_send_destination);
+    freez(host->health_default_exec);
+    freez(host->health_default_recipient);
+    freez(host->health_log_filename);
+    freez(host->hostname);
+    freez(host->registry_hostname);
+    simple_pattern_free(host->rrdpush_send_charts_matching);
+    rrdhost_unlock(host);
+    netdata_rwlock_destroy(&host->labels.labels_rwlock);
+    netdata_rwlock_destroy(&host->health_log.alarm_log_rwlock);
+    netdata_rwlock_destroy(&host->rrdhost_rwlock);
+
+    freez(host);
+
+    rrd_hosts_available--;
+}
+
+void rrdhost_free_all(void) {
+    rrd_wrlock();
+    /* Make sure child-hosts are released before the localhost. */
+    while(localhost->next) rrdhost_free(localhost->next);
+    rrdhost_free(localhost);
+    rrd_unlock();
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - save host files
+
+void rrdhost_save_charts(RRDHOST *host) {
+    if(!host) return;
+
+    info("Saving/Closing database of host '%s'...", host->hostname);
+
+    RRDSET *st;
+
+    // we get a write lock
+    // to ensure only one thread is saving the database
+    rrdhost_wrlock(host);
+
+    rrdset_foreach_write(st, host) {
+        rrdset_rdlock(st);
+        rrdset_save(st);
+        rrdset_unlock(st);
+    }
+
+    rrdhost_unlock(host);
+}
+
+static struct label *rrdhost_load_auto_labels(void)
+{
+    struct label *label_list = NULL;
+
+    if (localhost->system_info->host_os_name)
+        label_list =
+            add_label_to_list(label_list, "_os_name", localhost->system_info->host_os_name, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->host_os_version)
+        label_list =
+            add_label_to_list(label_list, "_os_version", localhost->system_info->host_os_version, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->kernel_version)
+        label_list =
+            add_label_to_list(label_list, "_kernel_version", localhost->system_info->kernel_version, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->host_cores)
+        label_list =
+                add_label_to_list(label_list, "_system_cores", localhost->system_info->host_cores, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->host_cpu_freq)
+        label_list =
+                add_label_to_list(label_list, "_system_cpu_freq", localhost->system_info->host_cpu_freq, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->host_ram_total)
+        label_list =
+                add_label_to_list(label_list, "_system_ram_total", localhost->system_info->host_ram_total, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->host_disk_space)
+        label_list =
+                add_label_to_list(label_list, "_system_disk_space", localhost->system_info->host_disk_space, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->architecture)
+        label_list =
+            add_label_to_list(label_list, "_architecture", localhost->system_info->architecture, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->virtualization)
+        label_list =
+            add_label_to_list(label_list, "_virtualization", localhost->system_info->virtualization, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->container)
+        label_list =
+            add_label_to_list(label_list, "_container", localhost->system_info->container, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->container_detection)
+        label_list =
+            add_label_to_list(label_list, "_container_detection", localhost->system_info->container_detection, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->virt_detection)
+        label_list =
+            add_label_to_list(label_list, "_virt_detection", localhost->system_info->virt_detection, LABEL_SOURCE_AUTO);
+
+    if (localhost->system_info->is_k8s_node)
+        label_list =
+            add_label_to_list(label_list, "_is_k8s_node", localhost->system_info->is_k8s_node, LABEL_SOURCE_AUTO);
+
+    label_list = add_aclk_host_labels(label_list);
+
+    label_list = add_label_to_list(
+        label_list, "_is_parent", (localhost->next || configured_as_parent()) ? "true" : "false", LABEL_SOURCE_AUTO);
+
+    if (localhost->rrdpush_send_destination)
+        label_list =
+            add_label_to_list(label_list, "_streams_to", localhost->rrdpush_send_destination, LABEL_SOURCE_AUTO);
+
+    return label_list;
+}
+
+static inline int rrdhost_is_valid_label_config_option(char *name, char *value)
+{
+    return (is_valid_label_key(name) && is_valid_label_value(value) && strcmp(name, "from environment") &&
+            strcmp(name, "from kubernetes pods"));
+}
+
+static struct label *rrdhost_load_config_labels()
+{
+    int status = config_load(NULL, 1, CONFIG_SECTION_HOST_LABEL);
+    if(!status) {
+        char *filename = CONFIG_DIR "/" CONFIG_FILENAME;
+        error("LABEL: Cannot reload the configuration file '%s', using labels in memory", filename);
+    }
+
+    struct label *l = NULL;
+    struct section *co = appconfig_get_section(&netdata_config, CONFIG_SECTION_HOST_LABEL);
+    if(co) {
+        config_section_wrlock(co);
+        struct config_option *cv;
+        for(cv = co->values; cv ; cv = cv->next) {
+            if(rrdhost_is_valid_label_config_option(cv->name, cv->value)) {
+                l = add_label_to_list(l, cv->name, cv->value, LABEL_SOURCE_NETDATA_CONF);
+                cv->flags |= CONFIG_VALUE_USED;
+            } else {
+                error("LABELS: It was not possible to create the label '%s' because it contains invalid character(s) or values."
+                       , cv->name);
+            }
+        }
+        config_section_unlock(co);
+    }
+
+    return l;
+}
+
+struct label *parse_simple_tags(
+    struct label *label_list,
+    const char *tags,
+    char key_value_separator,
+    char label_separator,
+    STRIP_QUOTES_OPTION strip_quotes_from_key,
+    STRIP_QUOTES_OPTION strip_quotes_from_value,
+    SKIP_ESCAPED_CHARACTERS_OPTION skip_escaped_characters)
+{
+    const char *end = tags;
+
+    while (*end) {
+        const char *start = end;
+        char key[CONFIG_MAX_VALUE + 1];
+        char value[CONFIG_MAX_VALUE + 1];
+
+        while (*end && *end != key_value_separator)
+            end++;
+        strncpyz(key, start, end - start);
+
+        if (*end)
+            start = ++end;
+        while (*end && *end != label_separator)
+            end++;
+        strncpyz(value, start, end - start);
+
+        label_list = add_label_to_list(
+            label_list,
+            strip_quotes_from_key ? strip_double_quotes(trim(key), skip_escaped_characters) : trim(key),
+            strip_quotes_from_value ? strip_double_quotes(trim(value), skip_escaped_characters) : trim(value),
+            LABEL_SOURCE_NETDATA_CONF);
+
+        if (*end)
+            end++;
+    }
+
+    return label_list;
+}
+
+struct label *parse_json_tags(struct label *label_list, const char *tags)
+{
+    char tags_buf[CONFIG_MAX_VALUE + 1];
+    strncpy(tags_buf, tags, CONFIG_MAX_VALUE);
+    char *str = tags_buf;
+
+    switch (*str) {
+    case '{':
+        str++;
+        strip_last_symbol(str, '}', SKIP_ESCAPED_CHARACTERS);
+
+        label_list = parse_simple_tags(label_list, str, ':', ',', STRIP_QUOTES, STRIP_QUOTES, SKIP_ESCAPED_CHARACTERS);
+
+        break;
+    case '[':
+        str++;
+        strip_last_symbol(str, ']', SKIP_ESCAPED_CHARACTERS);
+
+        char *end = str + strlen(str);
+        size_t i = 0;
+
+        while (str < end) {
+            char key[CONFIG_MAX_VALUE + 1];
+            snprintfz(key, CONFIG_MAX_VALUE, "host_tag%zu", i);
+
+            str = strip_double_quotes(trim(str), SKIP_ESCAPED_CHARACTERS);
+
+            label_list = add_label_to_list(label_list, key, str, LABEL_SOURCE_NETDATA_CONF);
+
+            // skip to the next element in the array
+            str += strlen(str) + 1;
+            while (*str && *str != ',')
+                str++;
+            str++;
+            i++;
+        }
+
+        break;
+    case '"':
+        label_list = add_label_to_list(
+            label_list, "host_tag", strip_double_quotes(str, SKIP_ESCAPED_CHARACTERS), LABEL_SOURCE_NETDATA_CONF);
+        break;
+    default:
+        label_list = add_label_to_list(label_list, "host_tag", str, LABEL_SOURCE_NETDATA_CONF);
+        break;
+    }
+
+    return label_list;
+}
+
+static struct label *rrdhost_load_labels_from_tags(void)
+{
+    if (!localhost->tags)
+        return NULL;
+
+    struct label *label_list = NULL;
+    BACKEND_TYPE type = BACKEND_TYPE_UNKNOWN;
+
+    if (config_exists(CONFIG_SECTION_BACKEND, "enabled")) {
+        if (config_get_boolean(CONFIG_SECTION_BACKEND, "enabled", CONFIG_BOOLEAN_NO) != CONFIG_BOOLEAN_NO) {
+            const char *type_name = config_get(CONFIG_SECTION_BACKEND, "type", "graphite");
+            type = backend_select_type(type_name);
+        }
+    }
+
+    switch (type) {
+        case BACKEND_TYPE_GRAPHITE:
+            label_list = parse_simple_tags(
+                label_list, localhost->tags, '=', ';', DO_NOT_STRIP_QUOTES, DO_NOT_STRIP_QUOTES,
+                DO_NOT_SKIP_ESCAPED_CHARACTERS);
+            break;
+        case BACKEND_TYPE_OPENTSDB_USING_TELNET:
+            label_list = parse_simple_tags(
+                label_list, localhost->tags, '=', ' ', DO_NOT_STRIP_QUOTES, DO_NOT_STRIP_QUOTES,
+                DO_NOT_SKIP_ESCAPED_CHARACTERS);
+            break;
+        case BACKEND_TYPE_OPENTSDB_USING_HTTP:
+            label_list = parse_simple_tags(
+                label_list, localhost->tags, ':', ',', STRIP_QUOTES, STRIP_QUOTES,
+                DO_NOT_SKIP_ESCAPED_CHARACTERS);
+            break;
+        case BACKEND_TYPE_JSON:
+            label_list = parse_json_tags(label_list, localhost->tags);
+            break;
+        default:
+            label_list = parse_simple_tags(
+                label_list, localhost->tags, '=', ',', DO_NOT_STRIP_QUOTES, STRIP_QUOTES,
+                DO_NOT_SKIP_ESCAPED_CHARACTERS);
+            break;
+    }
+
+    return label_list;
+}
+
+static struct label *rrdhost_load_kubernetes_labels(void)
+{
+    struct label *l=NULL;
+    char *label_script = mallocz(sizeof(char) * (strlen(netdata_configured_primary_plugins_dir) + strlen("get-kubernetes-labels.sh") + 2));
+    sprintf(label_script, "%s/%s", netdata_configured_primary_plugins_dir, "get-kubernetes-labels.sh");
+    if (unlikely(access(label_script, R_OK) != 0)) {
+        error("Kubernetes pod label fetching script %s not found.",label_script);
+        freez(label_script);
+    } else {
+        pid_t command_pid;
+
+        debug(D_RRDHOST, "Attempting to fetch external labels via %s", label_script);
+
+        FILE *fp = mypopen(label_script, &command_pid);
+        if(fp) {
+            int MAX_LINE_SIZE=300;
+            char buffer[MAX_LINE_SIZE + 1];
+            while (fgets(buffer, MAX_LINE_SIZE, fp) != NULL) {
+                char *name=buffer;
+                char *value=buffer;
+                while (*value && *value != ':') value++;
+                if (*value == ':') {
+                    *value = '\0';
+                    value++;
+                }
+                char *eos=value;
+                while (*eos && *eos != '\n') eos++;
+                if (*eos == '\n') *eos = '\0';
+                if (strlen(value)>0) {
+                    if (is_valid_label_key(name)){
+                        l = add_label_to_list(l, name, value, LABEL_SOURCE_KUBERNETES);
+                    } else {
+                        info("Ignoring invalid label name '%s'", name);
+                    }
+                } else {
+                    error("%s outputted unexpected result: '%s'", label_script, name);
+                }
+            };
+            // Non-zero exit code means that all the script output is error messages. We've shown already any message that didn't include a ':'
+            // Here we'll inform with an ERROR that the script failed, show whatever (if anything) was added to the list of labels, free the memory and set the return to null
+            int retcode=mypclose(fp, command_pid);
+            if (retcode) {
+                error("%s exited abnormally. No kubernetes labels will be added to the host.", label_script);
+                struct label *ll=l;
+                while (ll != NULL) {
+                    info("Ignoring Label [source id=%s]: \"%s\" -> \"%s\"\n", translate_label_source(ll->label_source), ll->key, ll->value);
+                    ll = ll->next;
+                    freez(l);
+                    l=ll;
+                }
+            }
+        }
+        freez(label_script);
+    }
+
+    return l;
+}
+
+void reload_host_labels(void)
+{
+    struct label *from_auto = rrdhost_load_auto_labels();
+    struct label *from_k8s = rrdhost_load_kubernetes_labels();
+    struct label *from_config = rrdhost_load_config_labels();
+    struct label *from_tags = rrdhost_load_labels_from_tags();
+
+    struct label *new_labels = merge_label_lists(from_auto, from_k8s);
+    new_labels = merge_label_lists(new_labels, from_tags);
+    new_labels = merge_label_lists(new_labels, from_config);
+
+    rrdhost_rdlock(localhost);
+    replace_label_list(&localhost->labels, new_labels);
+
+    health_label_log_save(localhost);
+    rrdhost_unlock(localhost);
+
+/*  TODO-GAPS - fix this so that it looks properly at the state and version of the sender
+    if(localhost->rrdpush_send_enabled && localhost->rrdpush_sender_buffer){
+        localhost->labels.labels_flag |= LABEL_FLAG_UPDATE_STREAM;
+        rrdpush_send_labels(localhost);
+    }
+*/
+    health_reload();
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - delete host files
+
+void rrdhost_delete_charts(RRDHOST *host) {
+    if(!host) return;
+
+    info("Deleting database of host '%s'...", host->hostname);
+
+    RRDSET *st;
+
+    // we get a write lock
+    // to ensure only one thread is saving the database
+    rrdhost_wrlock(host);
+
+    rrdset_foreach_write(st, host) {
+        rrdset_rdlock(st);
+        rrdset_delete(st);
+        rrdset_unlock(st);
+    }
+
+    recursively_delete_dir(host->cache_dir, "left over host");
+
+    rrdhost_unlock(host);
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - cleanup host files
+
+void rrdhost_cleanup_charts(RRDHOST *host) {
+    if(!host) return;
+
+    info("Cleaning up database of host '%s'...", host->hostname);
+
+    RRDSET *st;
+    uint32_t rrdhost_delete_obsolete_charts = rrdhost_flag_check(host, RRDHOST_FLAG_DELETE_OBSOLETE_CHARTS);
+
+    // we get a write lock
+    // to ensure only one thread is saving the database
+    rrdhost_wrlock(host);
+
+    rrdset_foreach_write(st, host) {
+        rrdset_rdlock(st);
+
+        if(rrdhost_delete_obsolete_charts && rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE))
+            rrdset_delete(st);
+        else if(rrdhost_delete_obsolete_charts && rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE_DIMENSIONS))
+            rrdset_delete_obsolete_dimensions(st);
+        else
+            rrdset_save(st);
+
+        rrdset_unlock(st);
+    }
+
+    rrdhost_unlock(host);
+}
+
+
+// ----------------------------------------------------------------------------
+// RRDHOST - save all hosts to disk
+
+void rrdhost_save_all(void) {
+    info("Saving database [%zu hosts(s)]...", rrd_hosts_available);
+
+    rrd_rdlock();
+
+    RRDHOST *host;
+    rrdhost_foreach_read(host)
+        rrdhost_save_charts(host);
+
+    rrd_unlock();
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - save or delete all hosts from disk
+
+void rrdhost_cleanup_all(void) {
+    info("Cleaning up database [%zu hosts(s)]...", rrd_hosts_available);
+
+    rrd_rdlock();
+
+    RRDHOST *host;
+    rrdhost_foreach_read(host) {
+        if (host != localhost && rrdhost_flag_check(host, RRDHOST_FLAG_DELETE_ORPHAN_HOST) && !host->receiver
+#ifdef ENABLE_DBENGINE
+            /* don't delete multi-host DB host files */
+            && !(host->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE && host->rrdeng_ctx == &multidb_ctx)
+#endif
+        )
+            rrdhost_delete_charts(host);
+        else
+            rrdhost_cleanup_charts(host);
+    }
+
+    rrd_unlock();
+}
+
+
+// ----------------------------------------------------------------------------
+// RRDHOST - save or delete all the host charts from disk
+
+void rrdhost_cleanup_obsolete_charts(RRDHOST *host) {
+    time_t now = now_realtime_sec();
+
+    RRDSET *st;
+
+    uint32_t rrdhost_delete_obsolete_charts = rrdhost_flag_check(host, RRDHOST_FLAG_DELETE_OBSOLETE_CHARTS);
+
+restart_after_removal:
+    rrdset_foreach_write(st, host) {
+        if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE)
+                    && st->last_accessed_time + rrdset_free_obsolete_time < now
+                    && st->last_updated.tv_sec + rrdset_free_obsolete_time < now
+                    && st->last_collected_time.tv_sec + rrdset_free_obsolete_time < now
+        )) {
+#ifdef ENABLE_DBENGINE
+            if(st->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE) {
+                RRDDIM *rd, *last;
+
+                rrdset_flag_set(st, RRDSET_FLAG_ARCHIVED);
+                while (st->variables)  rrdsetvar_free(st->variables);
+                while (st->alarms)     rrdsetcalc_unlink(st->alarms);
+                rrdset_wrlock(st);
+                for (rd = st->dimensions, last = NULL ; likely(rd) ; ) {
+                    if (rrddim_flag_check(rd, RRDDIM_FLAG_ARCHIVED)) {
+                        last = rd;
+                        rd = rd->next;
+                        continue;
+                    }
+
+                    rrddim_flag_set(rd, RRDDIM_FLAG_ARCHIVED);
+                    while (rd->variables)
+                        rrddimvar_free(rd->variables);
+
+                    if (rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE)) {
+                        rrddim_flag_clear(rd, RRDDIM_FLAG_OBSOLETE);
+                        /* only a collector can mark a chart as obsolete, so we must remove the reference */
+                        uint8_t can_delete_metric = rd->state->collect_ops.finalize(rd);
+                        if (can_delete_metric) {
+                            /* This metric has no data and no references */
+                            delete_dimension_uuid(rd->state->metric_uuid);
+                            rrddim_free(st, rd);
+                            if (unlikely(!last)) {
+                                rd = st->dimensions;
+                            }
+                            else {
+                                rd = last->next;
+                            }
+                            continue;
+                        }
+                    }
+                    last = rd;
+                    rd = rd->next;
+                }
+                rrdset_unlock(st);
+
+                debug(D_RRD_CALLS, "RRDSET: Cleaning up remaining chart variables for host '%s', chart '%s'", host->hostname, st->id);
+                rrdvar_free_remaining_variables(host, &st->rrdvar_root_index);
+
+                rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
+                if (st->dimensions) {
+                    /* If the chart still has dimensions don't delete it from the metadata log */
+                    continue;
+                }
+            }
+#endif
+            rrdset_rdlock(st);
+
+            if(rrdhost_delete_obsolete_charts)
+                rrdset_delete(st);
+            else
+                rrdset_save(st);
+
+            rrdset_unlock(st);
+
+            rrdset_free(st);
+            goto restart_after_removal;
+        }
+    }
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - set system info from environment variables
+// system_info fields must be heap allocated or NULL
+int rrdhost_set_system_info_variable(struct rrdhost_system_info *system_info, char *name, char *value) {
+    int res = 0;
+
+    if (!strcmp(name, "NETDATA_PROTOCOL_VERSION"))
+        return res;
+    else if(!strcmp(name, "NETDATA_CONTAINER_OS_NAME")){
+        freez(system_info->container_os_name);
+        system_info->container_os_name = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_CONTAINER_OS_ID")){
+        freez(system_info->container_os_id);
+        system_info->container_os_id = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_CONTAINER_OS_ID_LIKE")){
+        freez(system_info->container_os_id_like);
+        system_info->container_os_id_like = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_CONTAINER_OS_VERSION")){
+        freez(system_info->container_os_version);
+        system_info->container_os_version = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_CONTAINER_OS_VERSION_ID")){
+        freez(system_info->container_os_version_id);
+        system_info->container_os_version_id = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_CONTAINER_OS_DETECTION")){
+        freez(system_info->host_os_detection);
+        system_info->host_os_detection = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_HOST_OS_NAME")){
+        freez(system_info->host_os_name);
+        system_info->host_os_name = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_HOST_OS_ID")){
+        freez(system_info->host_os_id);
+        system_info->host_os_id = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_HOST_OS_ID_LIKE")){
+        freez(system_info->host_os_id_like);
+        system_info->host_os_id_like = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_HOST_OS_VERSION")){
+        freez(system_info->host_os_version);
+        system_info->host_os_version = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_HOST_OS_VERSION_ID")){
+        freez(system_info->host_os_version_id);
+        system_info->host_os_version_id = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_HOST_OS_DETECTION")){
+        freez(system_info->host_os_detection);
+        system_info->host_os_detection = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_KERNEL_NAME")){
+        freez(system_info->kernel_name);
+        system_info->kernel_name = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_CPU_LOGICAL_CPU_COUNT")){
+        freez(system_info->host_cores);
+        system_info->host_cores = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_CPU_FREQ")){
+        freez(system_info->host_cpu_freq);
+        system_info->host_cpu_freq = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_TOTAL_RAM")){
+        freez(system_info->host_ram_total);
+        system_info->host_ram_total = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_TOTAL_DISK_SIZE")){
+        freez(system_info->host_disk_space);
+        system_info->host_disk_space = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_KERNEL_VERSION")){
+        freez(system_info->kernel_version);
+        system_info->kernel_version = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_ARCHITECTURE")){
+        freez(system_info->architecture);
+        system_info->architecture = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_VIRTUALIZATION")){
+        freez(system_info->virtualization);
+        system_info->virtualization = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_VIRT_DETECTION")){
+        freez(system_info->virt_detection);
+        system_info->virt_detection = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_CONTAINER")){
+        freez(system_info->container);
+        system_info->container = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_SYSTEM_CONTAINER_DETECTION")){
+        freez(system_info->container_detection);
+        system_info->container_detection = strdupz(value);
+    }
+    else if(!strcmp(name, "NETDATA_HOST_IS_K8S_NODE")){
+        freez(system_info->is_k8s_node);
+        system_info->is_k8s_node = strdupz(value);
+    }
+    else if (!strcmp(name, "NETDATA_SYSTEM_CPU_VENDOR"))
+        return res;
+    else if (!strcmp(name, "NETDATA_SYSTEM_CPU_MODEL"))
+        return res;
+    else if (!strcmp(name, "NETDATA_SYSTEM_CPU_DETECTION"))
+        return res;
+    else if (!strcmp(name, "NETDATA_SYSTEM_RAM_DETECTION"))
+        return res;
+    else if (!strcmp(name, "NETDATA_SYSTEM_DISK_DETECTION"))
+        return res;
+    else {
+        res = 1;
+    }
+
+    return res;
+}
+
+/**
+ * Alarm Compare ID
+ *
+ * Callback function used with the binary trees to compare the id of RRDCALC
+ *
+ * @param a a pointer to the RRDCAL item to insert,compare or update the binary tree
+ * @param b the pointer to the binary tree.
+ *
+ * @return It returns 0 case the values are equal, 1 case a is bigger than b and -1 case a is smaller than b.
+ */
+int alarm_compare_id(void *a, void *b) {
+    register uint32_t hash1 = ((RRDCALC *)a)->id;
+    register uint32_t hash2 = ((RRDCALC *)b)->id;
+
+    if(hash1 < hash2) return -1;
+    else if(hash1 > hash2) return 1;
+
+    return 0;
+}
+
+/**
+ * Alarm Compare NAME
+ *
+ * Callback function used with the binary trees to compare the name of RRDCALC
+ *
+ * @param a a pointer to the RRDCAL item to insert,compare or update the binary tree
+ * @param b the pointer to the binary tree.
+ *
+ * @return It returns 0 case the values are equal, 1 case a is bigger than b and -1 case a is smaller than b.
+ */
+int alarm_compare_name(void *a, void *b) {
+    RRDCALC *in1 = (RRDCALC *)a;
+    RRDCALC *in2 = (RRDCALC *)b;
+
+    if(in1->hash < in2->hash) return -1;
+    else if(in1->hash > in2->hash) return 1;
+
+    return strcmp(in1->name,in2->name);
+}
+
+// Added for gap-filling, if this proves to be a bottleneck in large-scale systems then we will need to cache
+// the last entry times as the metric updates, but let's see if it is a problem first.
+time_t rrdhost_last_entry_t(RRDHOST *h) {
+    rrdhost_rdlock(h);
+    RRDSET *st;
+    time_t result = 0;
+    rrdset_foreach_read(st, h) {
+        time_t st_last = rrdset_last_entry_t(st);
+        if (st_last > result)
+            result = st_last;
+    }
+    rrdhost_unlock(h);
+    return result;
+}