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health.c
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health.c
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// SPDX-License-Identifier: GPL-3.0-or-later
#include "health.h"
unsigned int default_health_enabled = 1;
char *silencers_filename;
// the queue of executed alarm notifications that haven't been waited for yet
static struct {
ALARM_ENTRY *head; // oldest
ALARM_ENTRY *tail; // latest
} alarm_notifications_in_progress = {NULL, NULL};
static inline void enqueue_alarm_notify_in_progress(ALARM_ENTRY *ae)
{
ae->prev_in_progress = NULL;
ae->next_in_progress = NULL;
if (NULL != alarm_notifications_in_progress.tail) {
ae->prev_in_progress = alarm_notifications_in_progress.tail;
alarm_notifications_in_progress.tail->next_in_progress = ae;
}
if (NULL == alarm_notifications_in_progress.head) {
alarm_notifications_in_progress.head = ae;
}
alarm_notifications_in_progress.tail = ae;
}
static inline void unlink_alarm_notify_in_progress(ALARM_ENTRY *ae)
{
struct alarm_entry *prev = ae->prev_in_progress;
struct alarm_entry *next = ae->next_in_progress;
if (NULL != prev) {
prev->next_in_progress = next;
}
if (NULL != next) {
next->prev_in_progress = prev;
}
if (ae == alarm_notifications_in_progress.head) {
alarm_notifications_in_progress.head = next;
}
if (ae == alarm_notifications_in_progress.tail) {
alarm_notifications_in_progress.tail = prev;
}
}
// ----------------------------------------------------------------------------
// health initialization
/**
* User Config directory
*
* Get the config directory for health and return it.
*
* @return a pointer to the user config directory
*/
inline char *health_user_config_dir(void) {
char buffer[FILENAME_MAX + 1];
snprintfz(buffer, FILENAME_MAX, "%s/health.d", netdata_configured_user_config_dir);
return config_get(CONFIG_SECTION_HEALTH, "health configuration directory", buffer);
}
/**
* Stock Config Directory
*
* Get the Stock config directory and return it.
*
* @return a pointer to the stock config directory.
*/
inline char *health_stock_config_dir(void) {
char buffer[FILENAME_MAX + 1];
snprintfz(buffer, FILENAME_MAX, "%s/health.d", netdata_configured_stock_config_dir);
return config_get(CONFIG_SECTION_HEALTH, "stock health configuration directory", buffer);
}
/**
* Silencers init
*
* Function used to initialize the silencer structure.
*/
static void health_silencers_init(void) {
FILE *fd = fopen(silencers_filename, "r");
if (fd) {
fseek(fd, 0 , SEEK_END);
off_t length = (off_t) ftell(fd);
fseek(fd, 0 , SEEK_SET);
if (length > 0 && length < HEALTH_SILENCERS_MAX_FILE_LEN) {
char *str = mallocz((length+1)* sizeof(char));
if(str) {
size_t copied;
copied = fread(str, sizeof(char), length, fd);
if (copied == (length* sizeof(char))) {
str[length] = 0x00;
json_parse(str, NULL, health_silencers_json_read_callback);
info("Parsed health silencers file %s", silencers_filename);
} else {
error("Cannot read the data from health silencers file %s", silencers_filename);
}
freez(str);
}
} else {
error("Health silencers file %s has the size %ld that is out of range[ 1 , %d ]. Aborting read.", silencers_filename, length, HEALTH_SILENCERS_MAX_FILE_LEN);
}
fclose(fd);
} else {
info("Cannot open the file %s, so Netdata will work with the default health configuration.",silencers_filename);
}
}
/**
* Health Init
*
* Initialize the health thread.
*/
void health_init(void) {
debug(D_HEALTH, "Health configuration initializing");
if(!(default_health_enabled = (unsigned int)config_get_boolean(CONFIG_SECTION_HEALTH, "enabled", default_health_enabled))) {
debug(D_HEALTH, "Health is disabled.");
return;
}
health_silencers_init();
}
// ----------------------------------------------------------------------------
// re-load health configuration
/**
* Reload host
*
* Reload configuration for a specific host.
*
* @param host the structure of the host that the function will reload the configuration.
*/
static void health_reload_host(RRDHOST *host) {
if(unlikely(!host->health_enabled))
return;
char *user_path = health_user_config_dir();
char *stock_path = health_stock_config_dir();
// free all running alarms
rrdhost_wrlock(host);
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;
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;
rrdhost_unlock(host);
// invalidate all previous entries in the alarm log
ALARM_ENTRY *t;
for(t = host->health_log.alarms ; t ; t = t->next) {
if(t->new_status != RRDCALC_STATUS_REMOVED)
t->flags |= HEALTH_ENTRY_FLAG_UPDATED;
}
rrdhost_rdlock(host);
// reset all thresholds to all charts
RRDSET *st;
rrdset_foreach_read(st, host) {
st->green = NAN;
st->red = NAN;
}
rrdhost_unlock(host);
// load the new alarms
rrdhost_wrlock(host);
health_readdir(host, user_path, stock_path, NULL);
//Discard alarms with labels that do not apply to host
rrdcalc_labels_unlink_alarm_from_host(host);
// link the loaded alarms to their charts
RRDDIM *rd;
rrdset_foreach_write(st, host) {
if (rrdset_flag_check(st, RRDSET_FLAG_ARCHIVED))
continue;
rrdsetcalc_link_matching(st);
rrdcalctemplate_link_matching(st);
//This loop must be the last, because ` rrdcalctemplate_link_matching` will create alarms related to it.
rrdset_rdlock(st);
rrddim_foreach_read(rd, st) {
rrdcalc_link_to_rrddim(rd, st, host);
}
rrdset_unlock(st);
}
rrdhost_unlock(host);
}
/**
* Reload
*
* Reload the host configuration for all hosts.
*/
void health_reload(void) {
#ifdef ENABLE_ACLK
if (netdata_cloud_setting)
aclk_single_update_disable();
#endif
rrd_rdlock();
RRDHOST *host;
rrdhost_foreach_read(host)
health_reload_host(host);
rrd_unlock();
#ifdef ENABLE_ACLK
if (netdata_cloud_setting) {
aclk_single_update_enable();
aclk_alarm_reload();
}
#endif
}
// ----------------------------------------------------------------------------
// health main thread and friends
static inline RRDCALC_STATUS rrdcalc_value2status(calculated_number n) {
if(isnan(n) || isinf(n)) return RRDCALC_STATUS_UNDEFINED;
if(n) return RRDCALC_STATUS_RAISED;
return RRDCALC_STATUS_CLEAR;
}
#define ALARM_EXEC_COMMAND_LENGTH 8192
static inline void health_alarm_execute(RRDHOST *host, ALARM_ENTRY *ae) {
ae->flags |= HEALTH_ENTRY_FLAG_PROCESSED;
if(unlikely(ae->new_status < RRDCALC_STATUS_CLEAR)) {
// do not send notifications for internal statuses
debug(D_HEALTH, "Health not sending notification for alarm '%s.%s' status %s (internal statuses)", ae->chart, ae->name, rrdcalc_status2string(ae->new_status));
goto done;
}
if(unlikely(ae->new_status <= RRDCALC_STATUS_CLEAR && (ae->flags & HEALTH_ENTRY_FLAG_NO_CLEAR_NOTIFICATION))) {
// do not send notifications for disabled statuses
debug(D_HEALTH, "Health not sending notification for alarm '%s.%s' status %s (it has no-clear-notification enabled)", ae->chart, ae->name, rrdcalc_status2string(ae->new_status));
// mark it as run, so that we will send the same alarm if it happens again
goto done;
}
// find the previous notification for the same alarm
// which we have run the exec script
// exception: alarms with HEALTH_ENTRY_FLAG_NO_CLEAR_NOTIFICATION set
if(likely(!(ae->flags & HEALTH_ENTRY_FLAG_NO_CLEAR_NOTIFICATION))) {
uint32_t id = ae->alarm_id;
ALARM_ENTRY *t;
for(t = ae->next; t ; t = t->next) {
if(t->alarm_id == id && t->flags & HEALTH_ENTRY_FLAG_EXEC_RUN)
break;
}
if(likely(t)) {
// we have executed this alarm notification in the past
if(t && t->new_status == ae->new_status) {
// don't send the notification for the same status again
debug(D_HEALTH, "Health not sending again notification for alarm '%s.%s' status %s", ae->chart, ae->name
, rrdcalc_status2string(ae->new_status));
goto done;
}
}
else {
// we have not executed this alarm notification in the past
// so, don't send CLEAR notifications
if(unlikely(ae->new_status == RRDCALC_STATUS_CLEAR)) {
if((!(ae->flags & HEALTH_ENTRY_RUN_ONCE)) || (ae->flags & HEALTH_ENTRY_RUN_ONCE && ae->old_status < RRDCALC_STATUS_RAISED) ) {
debug(D_HEALTH, "Health not sending notification for first initialization of alarm '%s.%s' status %s"
, ae->chart, ae->name, rrdcalc_status2string(ae->new_status));
goto done;
}
}
}
}
// Check if alarm notifications are silenced
if (ae->flags & HEALTH_ENTRY_FLAG_SILENCED) {
info("Health not sending notification for alarm '%s.%s' status %s (command API has disabled notifications)", ae->chart, ae->name, rrdcalc_status2string(ae->new_status));
goto done;
}
static char command_to_run[ALARM_EXEC_COMMAND_LENGTH + 1];
const char *exec = (ae->exec) ? ae->exec : host->health_default_exec;
const char *recipient = (ae->recipient) ? ae->recipient : host->health_default_recipient;
int n_warn=0, n_crit=0;
RRDCALC *rc;
EVAL_EXPRESSION *expr=NULL;
BUFFER *warn_alarms, *crit_alarms;
warn_alarms = buffer_create(NETDATA_WEB_RESPONSE_INITIAL_SIZE);
crit_alarms = buffer_create(NETDATA_WEB_RESPONSE_INITIAL_SIZE);
for(rc = host->alarms; rc ; rc = rc->next) {
if(unlikely(!rc->rrdset || !rc->rrdset->last_collected_time.tv_sec))
continue;
if (unlikely(rc->status == RRDCALC_STATUS_WARNING)) {
if (likely(ae->alarm_id != rc->id) || likely(ae->alarm_event_id != rc->next_event_id - 1)) {
if (n_warn)
buffer_strcat(warn_alarms, ",");
buffer_strcat(warn_alarms, rc->name);
buffer_strcat(warn_alarms, "=");
buffer_snprintf(warn_alarms, 11, "%ld", rc->last_status_change);
n_warn++;
} else if (ae->alarm_id == rc->id)
expr = rc->warning;
} else if (unlikely(rc->status == RRDCALC_STATUS_CRITICAL)) {
if (likely(ae->alarm_id != rc->id) || likely(ae->alarm_event_id != rc->next_event_id - 1)) {
if (n_crit)
buffer_strcat(crit_alarms, ",");
buffer_strcat(crit_alarms, rc->name);
buffer_strcat(crit_alarms, "=");
buffer_snprintf(crit_alarms, 11, "%ld", rc->last_status_change);
n_crit++;
} else if (ae->alarm_id == rc->id)
expr = rc->critical;
} else if (unlikely(rc->status == RRDCALC_STATUS_CLEAR)) {
if (ae->alarm_id == rc->id)
expr = rc->warning;
}
}
char *edit_command = ae->source ? health_edit_command_from_source(ae->source) : strdupz("UNKNOWN=0");
snprintfz(command_to_run, ALARM_EXEC_COMMAND_LENGTH, "exec %s '%s' '%s' '%u' '%u' '%u' '%lu' '%s' '%s' '%s' '%s' '%s' '" CALCULATED_NUMBER_FORMAT_ZERO "' '" CALCULATED_NUMBER_FORMAT_ZERO "' '%s' '%u' '%u' '%s' '%s' '%s' '%s' '%s' '%s' '%d' '%d' '%s' '%s' '%s' '%s' '%s'",
exec,
recipient,
host->registry_hostname,
ae->unique_id,
ae->alarm_id,
ae->alarm_event_id,
(unsigned long)ae->when,
ae->name,
ae->chart?ae->chart:"NOCHART",
ae->family?ae->family:"NOFAMILY",
rrdcalc_status2string(ae->new_status),
rrdcalc_status2string(ae->old_status),
ae->new_value,
ae->old_value,
ae->source?ae->source:"UNKNOWN",
(uint32_t)ae->duration,
(uint32_t)ae->non_clear_duration,
ae->units?ae->units:"",
ae->info?ae->info:"",
ae->new_value_string,
ae->old_value_string,
(expr && expr->source)?expr->source:"NOSOURCE",
(expr && expr->error_msg)?buffer_tostring(expr->error_msg):"NOERRMSG",
n_warn,
n_crit,
buffer_tostring(warn_alarms),
buffer_tostring(crit_alarms),
ae->classification?ae->classification:"Unknown",
edit_command,
localhost->registry_hostname
);
ae->flags |= HEALTH_ENTRY_FLAG_EXEC_RUN;
ae->exec_run_timestamp = now_realtime_sec(); /* will be updated by real time after spawning */
debug(D_HEALTH, "executing command '%s'", command_to_run);
ae->flags |= HEALTH_ENTRY_FLAG_EXEC_IN_PROGRESS;
ae->exec_spawn_serial = spawn_enq_cmd(command_to_run);
enqueue_alarm_notify_in_progress(ae);
freez(edit_command);
buffer_free(warn_alarms);
buffer_free(crit_alarms);
return; //health_alarm_wait_for_execution
done:
health_alarm_log_save(host, ae);
}
static inline void health_alarm_wait_for_execution(ALARM_ENTRY *ae) {
if (!(ae->flags & HEALTH_ENTRY_FLAG_EXEC_IN_PROGRESS))
return;
spawn_wait_cmd(ae->exec_spawn_serial, &ae->exec_code, &ae->exec_run_timestamp);
debug(D_HEALTH, "done executing command - returned with code %d", ae->exec_code);
ae->flags &= ~HEALTH_ENTRY_FLAG_EXEC_IN_PROGRESS;
if(ae->exec_code != 0)
ae->flags |= HEALTH_ENTRY_FLAG_EXEC_FAILED;
unlink_alarm_notify_in_progress(ae);
}
static inline void health_process_notifications(RRDHOST *host, ALARM_ENTRY *ae) {
debug(D_HEALTH, "Health alarm '%s.%s' = " CALCULATED_NUMBER_FORMAT_AUTO " - changed status from %s to %s",
ae->chart?ae->chart:"NOCHART", ae->name,
ae->new_value,
rrdcalc_status2string(ae->old_status),
rrdcalc_status2string(ae->new_status)
);
health_alarm_execute(host, ae);
}
static inline void health_alarm_log_process(RRDHOST *host) {
uint32_t first_waiting = (host->health_log.alarms)?host->health_log.alarms->unique_id:0;
time_t now = now_realtime_sec();
netdata_rwlock_rdlock(&host->health_log.alarm_log_rwlock);
ALARM_ENTRY *ae;
for(ae = host->health_log.alarms; ae && ae->unique_id >= host->health_last_processed_id; ae = ae->next) {
if(likely(!alarm_entry_isrepeating(host, ae))) {
if(unlikely(
!(ae->flags & HEALTH_ENTRY_FLAG_PROCESSED) &&
!(ae->flags & HEALTH_ENTRY_FLAG_UPDATED)
)) {
if(unlikely(ae->unique_id < first_waiting))
first_waiting = ae->unique_id;
if(likely(now >= ae->delay_up_to_timestamp))
health_process_notifications(host, ae);
}
}
}
// remember this for the next iteration
host->health_last_processed_id = first_waiting;
netdata_rwlock_unlock(&host->health_log.alarm_log_rwlock);
if(host->health_log.count <= host->health_log.max)
return;
// cleanup excess entries in the log
netdata_rwlock_wrlock(&host->health_log.alarm_log_rwlock);
ALARM_ENTRY *last = NULL;
unsigned int count = host->health_log.max * 2 / 3;
for(ae = host->health_log.alarms; ae && count ; count--, last = ae, ae = ae->next) ;
if(ae && last && last->next == ae)
last->next = NULL;
else
ae = NULL;
while(ae) {
debug(D_HEALTH, "Health removing alarm log entry with id: %u", ae->unique_id);
ALARM_ENTRY *t = ae->next;
if(likely(!alarm_entry_isrepeating(host, ae))) {
health_alarm_wait_for_execution(ae);
health_alarm_log_free_one_nochecks_nounlink(ae);
host->health_log.count--;
}
ae = t;
}
netdata_rwlock_unlock(&host->health_log.alarm_log_rwlock);
}
static inline int rrdcalc_isrunnable(RRDCALC *rc, time_t now, time_t *next_run) {
if(unlikely(!rc->rrdset)) {
debug(D_HEALTH, "Health not running alarm '%s.%s'. It is not linked to a chart.", rc->chart?rc->chart:"NOCHART", rc->name);
return 0;
}
if(unlikely(rc->next_update > now)) {
if (unlikely(*next_run > rc->next_update)) {
// update the next_run time of the main loop
// to run this alarm precisely the time required
*next_run = rc->next_update;
}
debug(D_HEALTH, "Health not examining alarm '%s.%s' yet (will do in %d secs).", rc->chart?rc->chart:"NOCHART", rc->name, (int) (rc->next_update - now));
return 0;
}
if(unlikely(!rc->update_every)) {
debug(D_HEALTH, "Health not running alarm '%s.%s'. It does not have an update frequency", rc->chart?rc->chart:"NOCHART", rc->name);
return 0;
}
if(unlikely(rrdset_flag_check(rc->rrdset, RRDSET_FLAG_OBSOLETE))) {
debug(D_HEALTH, "Health not running alarm '%s.%s'. The chart has been marked as obsolete", rc->chart?rc->chart:"NOCHART", rc->name);
return 0;
}
if(unlikely(!rrdset_flag_check(rc->rrdset, RRDSET_FLAG_ENABLED))) {
debug(D_HEALTH, "Health not running alarm '%s.%s'. The chart is not enabled", rc->chart?rc->chart:"NOCHART", rc->name);
return 0;
}
if(unlikely(rrdset_flag_check(rc->rrdset, RRDSET_FLAG_ARCHIVED))) {
debug(D_HEALTH, "Health not running alarm '%s.%s'. The chart has been marked as archived", rc->chart?rc->chart:"NOCHART", rc->name);
return 0;
}
if(unlikely(!rc->rrdset->last_collected_time.tv_sec || rc->rrdset->counter_done < 2)) {
debug(D_HEALTH, "Health not running alarm '%s.%s'. Chart is not fully collected yet.", rc->chart?rc->chart:"NOCHART", rc->name);
return 0;
}
int update_every = rc->rrdset->update_every;
rrdset_rdlock(rc->rrdset);
time_t first = rrdset_first_entry_t_nolock(rc->rrdset);
time_t last = rrdset_last_entry_t_nolock(rc->rrdset);
rrdset_unlock(rc->rrdset);
if(unlikely(now + update_every < first /* || now - update_every > last */)) {
debug(D_HEALTH
, "Health not examining alarm '%s.%s' yet (wanted time is out of bounds - we need %lu but got %lu - %lu)."
, rc->chart ? rc->chart : "NOCHART", rc->name, (unsigned long) now, (unsigned long) first
, (unsigned long) last);
return 0;
}
if(RRDCALC_HAS_DB_LOOKUP(rc)) {
time_t needed = now + rc->before + rc->after;
if(needed + update_every < first || needed - update_every > last) {
debug(D_HEALTH
, "Health not examining alarm '%s.%s' yet (not enough data yet - we need %lu but got %lu - %lu)."
, rc->chart ? rc->chart : "NOCHART", rc->name, (unsigned long) needed, (unsigned long) first
, (unsigned long) last);
return 0;
}
}
return 1;
}
static inline int check_if_resumed_from_suspension(void) {
static usec_t last_realtime = 0, last_monotonic = 0;
usec_t realtime = now_realtime_usec(), monotonic = now_monotonic_usec();
int ret = 0;
// detect if monotonic and realtime have twice the difference
// in which case we assume the system was just waken from hibernation
if(last_realtime && last_monotonic && realtime - last_realtime > 2 * (monotonic - last_monotonic))
ret = 1;
last_realtime = realtime;
last_monotonic = monotonic;
return ret;
}
static void health_main_cleanup(void *ptr) {
struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
info("cleaning up...");
static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
}
static SILENCE_TYPE check_silenced(RRDCALC *rc, char* host, SILENCERS *silencers) {
SILENCER *s;
debug(D_HEALTH, "Checking if alarm was silenced via the command API. Alarm info name:%s context:%s chart:%s host:%s family:%s",
rc->name, (rc->rrdset)?rc->rrdset->context:"", rc->chart, host, (rc->rrdset)?rc->rrdset->family:"");
for (s = silencers->silencers; s!=NULL; s=s->next){
if (
(!s->alarms_pattern || (rc->name && s->alarms_pattern && simple_pattern_matches(s->alarms_pattern,rc->name))) &&
(!s->contexts_pattern || (rc->rrdset && rc->rrdset->context && s->contexts_pattern && simple_pattern_matches(s->contexts_pattern,rc->rrdset->context))) &&
(!s->hosts_pattern || (host && s->hosts_pattern && simple_pattern_matches(s->hosts_pattern,host))) &&
(!s->charts_pattern || (rc->chart && s->charts_pattern && simple_pattern_matches(s->charts_pattern,rc->chart))) &&
(!s->families_pattern || (rc->rrdset && rc->rrdset->family && s->families_pattern && simple_pattern_matches(s->families_pattern,rc->rrdset->family)))
) {
debug(D_HEALTH, "Alarm matches command API silence entry %s:%s:%s:%s:%s", s->alarms,s->charts, s->contexts, s->hosts, s->families);
if (unlikely(silencers->stype == STYPE_NONE)) {
debug(D_HEALTH, "Alarm %s matched a silence entry, but no SILENCE or DISABLE command was issued via the command API. The match has no effect.", rc->name);
} else {
debug(D_HEALTH, "Alarm %s via the command API - name:%s context:%s chart:%s host:%s family:%s"
, (silencers->stype == STYPE_DISABLE_ALARMS)?"Disabled":"Silenced"
, rc->name
, (rc->rrdset)?rc->rrdset->context:""
, rc->chart
, host
, (rc->rrdset)?rc->rrdset->family:""
);
}
return silencers->stype;
}
}
return STYPE_NONE;
}
/**
* Update Disabled Silenced
*
* Update the variable rrdcalc_flags of the structure RRDCALC according with the values of the host structure
*
* @param host structure that contains information about the host monitored.
* @param rc structure with information about the alarm
*
* @return It returns 1 case rrdcalc_flags is DISABLED or 0 otherwise
*/
static int update_disabled_silenced(RRDHOST *host, RRDCALC *rc) {
uint32_t rrdcalc_flags_old = rc->rrdcalc_flags;
// Clear the flags
rc->rrdcalc_flags &= ~(RRDCALC_FLAG_DISABLED | RRDCALC_FLAG_SILENCED);
if (unlikely(silencers->all_alarms)) {
if (silencers->stype == STYPE_DISABLE_ALARMS) rc->rrdcalc_flags |= RRDCALC_FLAG_DISABLED;
else if (silencers->stype == STYPE_SILENCE_NOTIFICATIONS) rc->rrdcalc_flags |= RRDCALC_FLAG_SILENCED;
} else {
SILENCE_TYPE st = check_silenced(rc, host->hostname, silencers);
if (st == STYPE_DISABLE_ALARMS) rc->rrdcalc_flags |= RRDCALC_FLAG_DISABLED;
else if (st == STYPE_SILENCE_NOTIFICATIONS) rc->rrdcalc_flags |= RRDCALC_FLAG_SILENCED;
}
if (rrdcalc_flags_old != rc->rrdcalc_flags) {
info("Alarm silencing changed for host '%s' alarm '%s': Disabled %s->%s Silenced %s->%s",
host->hostname,
rc->name,
(rrdcalc_flags_old & RRDCALC_FLAG_DISABLED)?"true":"false",
(rc->rrdcalc_flags & RRDCALC_FLAG_DISABLED)?"true":"false",
(rrdcalc_flags_old & RRDCALC_FLAG_SILENCED)?"true":"false",
(rc->rrdcalc_flags & RRDCALC_FLAG_SILENCED)?"true":"false"
);
}
if (rc->rrdcalc_flags & RRDCALC_FLAG_DISABLED)
return 1;
else
return 0;
}
/**
* Health Main
*
* The main thread of the health system. In this function all the alarms will be processed.
*
* @param ptr is a pointer to the netdata_static_thread structure.
*
* @return It always returns NULL
*/
void *health_main(void *ptr) {
netdata_thread_cleanup_push(health_main_cleanup, ptr);
int min_run_every = (int)config_get_number(CONFIG_SECTION_HEALTH, "run at least every seconds", 10);
if(min_run_every < 1) min_run_every = 1;
time_t now = now_realtime_sec();
time_t hibernation_delay = config_get_number(CONFIG_SECTION_HEALTH, "postpone alarms during hibernation for seconds", 60);
rrdcalc_labels_unlink();
unsigned int loop = 0;
while(!netdata_exit) {
loop++;
debug(D_HEALTH, "Health monitoring iteration no %u started", loop);
int runnable = 0, apply_hibernation_delay = 0;
time_t next_run = now + min_run_every;
RRDCALC *rc;
if (unlikely(check_if_resumed_from_suspension())) {
apply_hibernation_delay = 1;
info("Postponing alarm checks for %ld seconds, because it seems that the system was just resumed from suspension.",
hibernation_delay
);
}
if (unlikely(silencers->all_alarms && silencers->stype == STYPE_DISABLE_ALARMS)) {
static int logged=0;
if (!logged) {
info("Skipping health checks, because all alarms are disabled via a %s command.",
HEALTH_CMDAPI_CMD_DISABLEALL);
logged = 1;
}
}
rrd_rdlock();
RRDHOST *host;
rrdhost_foreach_read(host) {
if (unlikely(!host->health_enabled))
continue;
if (unlikely(apply_hibernation_delay)) {
info("Postponing health checks for %ld seconds, on host '%s'.", hibernation_delay, host->hostname
);
host->health_delay_up_to = now + hibernation_delay;
}
if (unlikely(host->health_delay_up_to)) {
if (unlikely(now < host->health_delay_up_to))
continue;
info("Resuming health checks on host '%s'.", host->hostname);
host->health_delay_up_to = 0;
}
rrdhost_rdlock(host);
// the first loop is to lookup values from the db
for (rc = host->alarms; rc; rc = rc->next) {
if (update_disabled_silenced(host, rc))
continue;
if (unlikely(!rrdcalc_isrunnable(rc, now, &next_run))) {
if (unlikely(rc->rrdcalc_flags & RRDCALC_FLAG_RUNNABLE))
rc->rrdcalc_flags &= ~RRDCALC_FLAG_RUNNABLE;
continue;
}
runnable++;
rc->old_value = rc->value;
rc->rrdcalc_flags |= RRDCALC_FLAG_RUNNABLE;
// ------------------------------------------------------------
// if there is database lookup, do it
if (unlikely(RRDCALC_HAS_DB_LOOKUP(rc))) {
/* time_t old_db_timestamp = rc->db_before; */
int value_is_null = 0;
int ret = rrdset2value_api_v1(rc->rrdset, NULL, &rc->value, rc->dimensions, 1, rc->after,
rc->before, rc->group, 0, rc->options, &rc->db_after,
&rc->db_before, &value_is_null
);
if (unlikely(ret != 200)) {
// database lookup failed
rc->value = NAN;
rc->rrdcalc_flags |= RRDCALC_FLAG_DB_ERROR;
debug(D_HEALTH, "Health on host '%s', alarm '%s.%s': database lookup returned error %d",
host->hostname, rc->chart ? rc->chart : "NOCHART", rc->name, ret
);
} else
rc->rrdcalc_flags &= ~RRDCALC_FLAG_DB_ERROR;
/* - RRDCALC_FLAG_DB_STALE not currently used
if (unlikely(old_db_timestamp == rc->db_before)) {
// database is stale
debug(D_HEALTH, "Health on host '%s', alarm '%s.%s': database is stale", host->hostname, rc->chart?rc->chart:"NOCHART", rc->name);
if (unlikely(!(rc->rrdcalc_flags & RRDCALC_FLAG_DB_STALE))) {
rc->rrdcalc_flags |= RRDCALC_FLAG_DB_STALE;
error("Health on host '%s', alarm '%s.%s': database is stale", host->hostname, rc->chart?rc->chart:"NOCHART", rc->name);
}
}
else if (unlikely(rc->rrdcalc_flags & RRDCALC_FLAG_DB_STALE))
rc->rrdcalc_flags &= ~RRDCALC_FLAG_DB_STALE;
*/
if (unlikely(value_is_null)) {
// collected value is null
rc->value = NAN;
rc->rrdcalc_flags |= RRDCALC_FLAG_DB_NAN;
debug(D_HEALTH,
"Health on host '%s', alarm '%s.%s': database lookup returned empty value (possibly value is not collected yet)",
host->hostname, rc->chart ? rc->chart : "NOCHART", rc->name
);
} else
rc->rrdcalc_flags &= ~RRDCALC_FLAG_DB_NAN;
debug(D_HEALTH, "Health on host '%s', alarm '%s.%s': database lookup gave value "
CALCULATED_NUMBER_FORMAT, host->hostname, rc->chart ? rc->chart : "NOCHART", rc->name,
rc->value
);
}
// ------------------------------------------------------------
// if there is calculation expression, run it
if (unlikely(rc->calculation)) {
if (unlikely(!expression_evaluate(rc->calculation))) {
// calculation failed
rc->value = NAN;
rc->rrdcalc_flags |= RRDCALC_FLAG_CALC_ERROR;
debug(D_HEALTH, "Health on host '%s', alarm '%s.%s': expression '%s' failed: %s",
host->hostname, rc->chart ? rc->chart : "NOCHART", rc->name,
rc->calculation->parsed_as, buffer_tostring(rc->calculation->error_msg)
);
} else {
rc->rrdcalc_flags &= ~RRDCALC_FLAG_CALC_ERROR;
debug(D_HEALTH, "Health on host '%s', alarm '%s.%s': expression '%s' gave value "
CALCULATED_NUMBER_FORMAT
": %s (source: %s)", host->hostname, rc->chart ? rc->chart : "NOCHART", rc->name,
rc->calculation->parsed_as, rc->calculation->result,
buffer_tostring(rc->calculation->error_msg), rc->source
);
rc->value = rc->calculation->result;
if (rc->local) rc->local->last_updated = now;
if (rc->family) rc->family->last_updated = now;
if (rc->hostid) rc->hostid->last_updated = now;
if (rc->hostname) rc->hostname->last_updated = now;
}
}
}
rrdhost_unlock(host);
if (unlikely(runnable && !netdata_exit)) {
rrdhost_rdlock(host);
for (rc = host->alarms; rc; rc = rc->next) {
if (unlikely(!(rc->rrdcalc_flags & RRDCALC_FLAG_RUNNABLE)))
continue;
if (rc->rrdcalc_flags & RRDCALC_FLAG_DISABLED) {
continue;
}
RRDCALC_STATUS warning_status = RRDCALC_STATUS_UNDEFINED;
RRDCALC_STATUS critical_status = RRDCALC_STATUS_UNDEFINED;
// --------------------------------------------------------
// check the warning expression
if (likely(rc->warning)) {
if (unlikely(!expression_evaluate(rc->warning))) {
// calculation failed
rc->rrdcalc_flags |= RRDCALC_FLAG_WARN_ERROR;
debug(D_HEALTH,
"Health on host '%s', alarm '%s.%s': warning expression failed with error: %s",
host->hostname, rc->chart ? rc->chart : "NOCHART", rc->name,
buffer_tostring(rc->warning->error_msg)
);
} else {
rc->rrdcalc_flags &= ~RRDCALC_FLAG_WARN_ERROR;
debug(D_HEALTH, "Health on host '%s', alarm '%s.%s': warning expression gave value "
CALCULATED_NUMBER_FORMAT
": %s (source: %s)", host->hostname, rc->chart ? rc->chart : "NOCHART",
rc->name, rc->warning->result, buffer_tostring(rc->warning->error_msg), rc->source
);
warning_status = rrdcalc_value2status(rc->warning->result);
}
}
// --------------------------------------------------------
// check the critical expression
if (likely(rc->critical)) {
if (unlikely(!expression_evaluate(rc->critical))) {
// calculation failed
rc->rrdcalc_flags |= RRDCALC_FLAG_CRIT_ERROR;
debug(D_HEALTH,
"Health on host '%s', alarm '%s.%s': critical expression failed with error: %s",
host->hostname, rc->chart ? rc->chart : "NOCHART", rc->name,
buffer_tostring(rc->critical->error_msg)
);
} else {
rc->rrdcalc_flags &= ~RRDCALC_FLAG_CRIT_ERROR;
debug(D_HEALTH, "Health on host '%s', alarm '%s.%s': critical expression gave value "
CALCULATED_NUMBER_FORMAT
": %s (source: %s)", host->hostname, rc->chart ? rc->chart : "NOCHART",
rc->name, rc->critical->result, buffer_tostring(rc->critical->error_msg),
rc->source
);
critical_status = rrdcalc_value2status(rc->critical->result);
}
}
// --------------------------------------------------------
// decide the final alarm status
RRDCALC_STATUS status = RRDCALC_STATUS_UNDEFINED;
switch (warning_status) {
case RRDCALC_STATUS_CLEAR:
status = RRDCALC_STATUS_CLEAR;
break;
case RRDCALC_STATUS_RAISED:
status = RRDCALC_STATUS_WARNING;
break;
default:
break;
}
switch (critical_status) {
case RRDCALC_STATUS_CLEAR:
if (status == RRDCALC_STATUS_UNDEFINED)
status = RRDCALC_STATUS_CLEAR;
break;
case RRDCALC_STATUS_RAISED:
status = RRDCALC_STATUS_CRITICAL;
break;
default:
break;
}
// --------------------------------------------------------
// check if the new status and the old differ
if (status != rc->status) {
int delay = 0;
// apply trigger hysteresis
if (now > rc->delay_up_to_timestamp) {
rc->delay_up_current = rc->delay_up_duration;
rc->delay_down_current = rc->delay_down_duration;
rc->delay_last = 0;
rc->delay_up_to_timestamp = 0;
} else {
rc->delay_up_current = (int) (rc->delay_up_current * rc->delay_multiplier);
if (rc->delay_up_current > rc->delay_max_duration)
rc->delay_up_current = rc->delay_max_duration;
rc->delay_down_current = (int) (rc->delay_down_current * rc->delay_multiplier);
if (rc->delay_down_current > rc->delay_max_duration)
rc->delay_down_current = rc->delay_max_duration;
}
if (status > rc->status)
delay = rc->delay_up_current;
else
delay = rc->delay_down_current;
// COMMENTED: because we do need to send raising alarms
// if(now + delay < rc->delay_up_to_timestamp)
// delay = (int)(rc->delay_up_to_timestamp - now);
rc->delay_last = delay;
rc->delay_up_to_timestamp = now + delay;
if(likely(!rrdcalc_isrepeating(rc))) {
ALARM_ENTRY *ae = health_create_alarm_entry(
host, rc->id, rc->next_event_id++, now, rc->name, rc->rrdset->id,
rc->rrdset->family, rc->classification, rc->component, rc->type, rc->exec, rc->recipient, now - rc->last_status_change,
rc->old_value, rc->value, rc->status, status, rc->source, rc->units, rc->info,
rc->delay_last,
(
((rc->options & RRDCALC_FLAG_NO_CLEAR_NOTIFICATION)? HEALTH_ENTRY_FLAG_NO_CLEAR_NOTIFICATION : 0) |
((rc->rrdcalc_flags & RRDCALC_FLAG_SILENCED)? HEALTH_ENTRY_FLAG_SILENCED : 0)
)
);
health_alarm_log(host, ae);
}
rc->last_status_change = now;
rc->old_status = rc->status;
rc->status = status;
}
rc->last_updated = now;
rc->next_update = now + rc->update_every;
if (next_run > rc->next_update)
next_run = rc->next_update;
}
// process repeating alarms
RRDCALC *rc;
for(rc = host->alarms; rc ; rc = rc->next) {
int repeat_every = 0;
if(unlikely(rrdcalc_isrepeating(rc))) {
if(unlikely(rc->status == RRDCALC_STATUS_WARNING)) {
rc->rrdcalc_flags &= ~RRDCALC_FLAG_RUN_ONCE;
repeat_every = rc->warn_repeat_every;
} else if(unlikely(rc->status == RRDCALC_STATUS_CRITICAL)) {
rc->rrdcalc_flags &= ~RRDCALC_FLAG_RUN_ONCE;
repeat_every = rc->crit_repeat_every;
} else if(unlikely(rc->status == RRDCALC_STATUS_CLEAR)) {
if(!(rc->rrdcalc_flags & RRDCALC_FLAG_RUN_ONCE)) {
if(rc->old_status == RRDCALC_STATUS_CRITICAL) {
repeat_every = 1;
} else if (rc->old_status == RRDCALC_STATUS_WARNING) {
repeat_every = 1;
}
}