/
check.go
722 lines (684 loc) · 20.9 KB
/
check.go
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package sched
import (
"fmt"
"math"
"time"
"bosun.org/cmd/bosun/cache"
"bosun.org/cmd/bosun/conf"
"bosun.org/cmd/bosun/expr"
"bosun.org/collect"
"bosun.org/metadata"
"bosun.org/models"
"bosun.org/opentsdb"
"bosun.org/slog"
"github.com/MiniProfiler/go/miniprofiler"
)
func init() {
metadata.AddMetricMeta(
"bosun.alerts.current_severity", metadata.Gauge, metadata.Alert,
"The number of open alerts by current severity.")
metadata.AddMetricMeta(
"bosun.alerts.last_abnormal_severity", metadata.Gauge, metadata.Alert,
"The number of open alerts by last abnormal severity.")
metadata.AddMetricMeta(
"bosun.alerts.acknowledgement_status", metadata.Gauge, metadata.Alert,
"The number of open alerts by acknowledgement status.")
metadata.AddMetricMeta(
"bosun.alerts.active_status", metadata.Gauge, metadata.Alert,
"The number of open alerts by active status.")
metadata.AddMetricMeta("alerts.acknowledgement_status_by_notification", metadata.Gauge, metadata.Alert,
"The number of alerts by acknowledgement status and notification. Does not reflect escalation chains.")
metadata.AddMetricMeta("alerts.oldest_unacked_by_notification", metadata.Gauge, metadata.Second,
"How old the oldest unacknowledged notification is by notification.. Does not reflect escalation chains.")
collect.AggregateMeta("bosun.template.render", metadata.MilliSecond, "The amount of time it takes to render the specified alert template.")
}
func NewIncident(ak models.AlertKey) *models.IncidentState {
s := &models.IncidentState{}
s.Start = utcNow()
s.AlertKey = ak
s.Alert = ak.Name()
s.Tags = ak.Group().Tags()
s.Result = &models.Result{}
return s
}
type RunHistory struct {
Cache *cache.Cache
Start time.Time
Backends *expr.Backends
Events map[models.AlertKey]*models.Event
schedule *Schedule
}
// AtTime creates a new RunHistory starting at t with the same context and
// events as rh.
func (rh *RunHistory) AtTime(t time.Time) *RunHistory {
n := *rh
n.Start = t
return &n
}
func (s *Schedule) NewRunHistory(start time.Time, cache *cache.Cache) *RunHistory {
r := &RunHistory{
Cache: cache,
Start: start,
Events: make(map[models.AlertKey]*models.Event),
schedule: s,
Backends: &expr.Backends{
TSDBContext: s.SystemConf.GetTSDBContext(),
GraphiteContext: s.SystemConf.GetGraphiteContext(),
InfluxConfig: s.SystemConf.GetInfluxContext(),
LogstashHosts: s.SystemConf.GetLogstashContext(),
ElasticHosts: s.SystemConf.GetElasticContext(),
AnnotateContext: s.SystemConf.GetAnnotateContext(),
},
}
return r
}
// RunHistory processes an event history and triggers notifications if needed.
func (s *Schedule) RunHistory(r *RunHistory) {
checkNotify := false
silenced := s.Silenced()
for ak, event := range r.Events {
shouldNotify, err := s.runHistory(r, ak, event, silenced)
checkNotify = checkNotify || shouldNotify
if err != nil {
slog.Errorf("Error in runHistory for %s. %s.", ak, err)
}
}
if checkNotify && s.nc != nil {
select {
case s.nc <- true:
default:
}
}
}
// RunHistory for a single alert key. Returns true if notifications were altered.
func (s *Schedule) runHistory(r *RunHistory, ak models.AlertKey, event *models.Event, silenced SilenceTester) (checkNotify bool, err error) {
event.Time = r.Start
a := s.RuleConf.GetAlert(ak.Name())
if a.UnknownsNormal && event.Status == models.StUnknown {
event.Status = models.StNormal
}
data := s.DataAccess.State()
err = data.TouchAlertKey(ak, utcNow())
if err != nil {
return
}
si := silenced(ak)
// get existing open incident if exists
var incident *models.IncidentState
incident, err = data.GetOpenIncident(ak)
if err != nil {
return
}
defer func() {
// save unless incident is new and closed (log alert)
if incident != nil && (incident.Id != 0 || incident.Open) {
_, err = data.UpdateIncidentState(incident)
} else {
err = data.SetUnevaluated(ak, event.Unevaluated) // if nothing to save, at least store the unevaluated state
}
}()
// If nothing is out of the ordinary we are done
if event.Status <= models.StNormal && incident == nil {
return
}
// if event is unevaluated, we are done also.
if incident != nil {
incident.Unevaluated = event.Unevaluated
}
if event.Unevaluated {
return
}
shouldNotify := false
newIncident := false
if incident == nil {
incident = NewIncident(ak)
newIncident = true
shouldNotify = true
}
// set state.Result according to event result
if event.Status == models.StCritical {
incident.Result = event.Crit
} else if event.Status == models.StWarning {
incident.Result = event.Warn
}
if event.Status > models.StNormal {
incident.LastAbnormalStatus = event.Status
incident.LastAbnormalTime = event.Time.UTC().Unix()
}
if event.Status > incident.WorstStatus {
incident.WorstStatus = event.Status
shouldNotify = true
}
if event.Status != incident.CurrentStatus {
incident.Events = append(incident.Events, *event)
}
incident.CurrentStatus = event.Status
//run a preliminary save on new incidents to get an id
if newIncident {
if a.Log || silencedOrIgnored(a, event, si) {
//a log or silenced/ignored alert will not need to be saved
} else {
incident.Id, err = s.DataAccess.State().UpdateIncidentState(incident)
if err != nil {
return
}
}
}
//render templates and open alert key if abnormal
if event.Status > models.StNormal {
s.executeTemplates(incident, event, a, r)
incident.Open = true
if a.Log {
incident.Open = false
}
}
// On state increase, clear old notifications and notify current.
// Do nothing if state did not change.
notify := func(ns *conf.Notifications) {
if a.Log {
lastLogTime := s.lastLogTimes[ak]
now := utcNow()
if now.Before(lastLogTime.Add(a.MaxLogFrequency)) {
return
}
s.lastLogTimes[ak] = now
}
nots := ns.Get(s.RuleConf, incident.AlertKey.Group())
for _, n := range nots {
s.Notify(incident, n)
checkNotify = true
}
}
notifyCurrent := func() {
//Auto close ignoreUnknowns for new incident.
if silencedOrIgnored(a, event, si) {
incident.Open = false
return
}
incident.NeedAck = true
switch event.Status {
case models.StCritical, models.StUnknown:
notify(a.CritNotification)
case models.StWarning:
notify(a.WarnNotification)
}
}
// lock while we change notifications.
s.Lock("RunHistory")
if shouldNotify {
incident.NeedAck = false
if err = s.DataAccess.Notifications().ClearNotifications(ak); err != nil {
return
}
notifyCurrent()
}
// finally close an open alert with silence once it goes back to normal.
if si := silenced(ak); si != nil && event.Status == models.StNormal {
go func(ak models.AlertKey) {
slog.Infof("auto close %s because was silenced", ak)
err := s.ActionByAlertKey("bosun", "Auto close because was silenced.", models.ActionClose, ak)
if err != nil {
slog.Errorln(err)
}
}(ak)
}
s.Unlock()
return checkNotify, nil
}
func silencedOrIgnored(a *conf.Alert, event *models.Event, si *models.Silence) bool {
if a.IgnoreUnknown && event.Status == models.StUnknown {
return true
}
if si != nil && si.Forget && event.Status == models.StUnknown {
return true
}
return false
}
func (s *Schedule) executeTemplates(state *models.IncidentState, event *models.Event, a *conf.Alert, r *RunHistory) {
if event.Status != models.StUnknown {
var errs []error
metric := "template.render"
//Render subject
endTiming := collect.StartTimer(metric, opentsdb.TagSet{"alert": a.Name, "type": "subject"})
subject, err := s.ExecuteSubject(r, a, state, false)
if err != nil {
slog.Infof("%s: %v", state.AlertKey, err)
errs = append(errs, err)
} else if subject == nil {
err = fmt.Errorf("Empty subject on %s", state.AlertKey)
slog.Error(err)
errs = append(errs, err)
}
endTiming()
//Render body
endTiming = collect.StartTimer(metric, opentsdb.TagSet{"alert": a.Name, "type": "body"})
body, _, err := s.ExecuteBody(r, a, state, false)
if err != nil {
slog.Infof("%s: %v", state.AlertKey, err)
errs = append(errs, err)
} else if subject == nil {
err = fmt.Errorf("Empty body on %s", state.AlertKey)
slog.Error(err)
errs = append(errs, err)
}
endTiming()
//Render email body
endTiming = collect.StartTimer(metric, opentsdb.TagSet{"alert": a.Name, "type": "emailbody"})
emailbody, attachments, err := s.ExecuteBody(r, a, state, true)
if err != nil {
slog.Infof("%s: %v", state.AlertKey, err)
errs = append(errs, err)
} else if subject == nil {
err = fmt.Errorf("Empty email body on %s", state.AlertKey)
slog.Error(err)
errs = append(errs, err)
}
endTiming()
//Render email subject
endTiming = collect.StartTimer(metric, opentsdb.TagSet{"alert": a.Name, "type": "emailsubject"})
emailsubject, err := s.ExecuteSubject(r, a, state, true)
if err != nil {
slog.Infof("%s: %v", state.AlertKey, err)
errs = append(errs, err)
} else if subject == nil {
err = fmt.Errorf("Empty email subject on %s", state.AlertKey)
slog.Error(err)
errs = append(errs, err)
}
endTiming()
if errs != nil {
endTiming = collect.StartTimer(metric, opentsdb.TagSet{"alert": a.Name, "type": "bad"})
subject, body, err = s.ExecuteBadTemplate(errs, r, a, state)
endTiming()
if err != nil {
subject = []byte(fmt.Sprintf("unable to create template error notification: %v", err))
}
emailbody = body
attachments = nil
}
state.Subject = string(subject)
state.Body = string(body)
//don't save email seperately if they are identical
if string(state.EmailBody) != state.Body {
state.EmailBody = emailbody
}
if string(state.EmailSubject) != state.Subject {
state.EmailSubject = emailsubject
}
state.Attachments = attachments
}
}
// CollectStates sends various state information to bosun with collect.
func (s *Schedule) CollectStates() {
// [AlertName][Severity]Count
severityCounts := make(map[string]map[string]int64)
abnormalCounts := make(map[string]map[string]int64)
ackStatusCounts := make(map[string]map[bool]int64)
ackByNotificationCounts := make(map[string]map[bool]int64)
unAckOldestByNotification := make(map[string]time.Time)
activeStatusCounts := make(map[string]map[bool]int64)
// Initalize the Counts
for _, alert := range s.RuleConf.GetAlerts() {
severityCounts[alert.Name] = make(map[string]int64)
abnormalCounts[alert.Name] = make(map[string]int64)
var i models.Status
for i = 1; i.String() != "none"; i++ {
severityCounts[alert.Name][i.String()] = 0
abnormalCounts[alert.Name][i.String()] = 0
}
ackStatusCounts[alert.Name] = make(map[bool]int64)
activeStatusCounts[alert.Name] = make(map[bool]int64)
ackStatusCounts[alert.Name][false] = 0
activeStatusCounts[alert.Name][false] = 0
ackStatusCounts[alert.Name][true] = 0
activeStatusCounts[alert.Name][true] = 0
}
for notificationName := range s.RuleConf.GetNotifications() {
unAckOldestByNotification[notificationName] = time.Unix(1<<63-62135596801, 999999999)
ackByNotificationCounts[notificationName] = make(map[bool]int64)
ackByNotificationCounts[notificationName][false] = 0
ackByNotificationCounts[notificationName][true] = 0
}
//TODO:
// for _, state := range s.status {
// if !state.Open {
// continue
// }
// name := state.AlertKey.Name()
// alertDef := s.Conf.Alerts[name]
// nots := make(map[string]bool)
// for name := range alertDef.WarnNotification.Get(s.Conf, state.Group) {
// nots[name] = true
// }
// for name := range alertDef.CritNotification.Get(s.Conf, state.Group) {
// nots[name] = true
// }
// incident, err := s.GetIncident(state.Last().IncidentId)
// if err != nil {
// slog.Errorln(err)
// }
// for notificationName := range nots {
// ackByNotificationCounts[notificationName][state.NeedAck]++
// if incident != nil && incident.Start.Before(unAckOldestByNotification[notificationName]) && state.NeedAck {
// unAckOldestByNotification[notificationName] = incident.Start
// }
// }
// severity := state.CurrentStatus.String()
// lastAbnormal := state.LastAbnormalStatus.String()
// severityCounts[state.Alert][severity]++
// abnormalCounts[state.Alert][lastAbnormal]++
// ackStatusCounts[state.Alert][state.NeedAck]++
// activeStatusCounts[state.Alert][state.IsActive()]++
// }
for notification := range ackByNotificationCounts {
ts := opentsdb.TagSet{"notification": notification}
err := collect.Put("alerts.acknowledgement_status_by_notification",
ts.Copy().Merge(opentsdb.TagSet{"status": "unacknowledged"}),
ackByNotificationCounts[notification][true])
if err != nil {
slog.Errorln(err)
}
err = collect.Put("alerts.acknowledgement_status_by_notification",
ts.Copy().Merge(opentsdb.TagSet{"status": "acknowledged"}),
ackByNotificationCounts[notification][false])
if err != nil {
slog.Errorln(err)
}
}
for notification, timeStamp := range unAckOldestByNotification {
ts := opentsdb.TagSet{"notification": notification}
var ago time.Duration
if !timeStamp.Equal(time.Unix(1<<63-62135596801, 999999999)) {
ago = utcNow().Sub(timeStamp)
}
err := collect.Put("alerts.oldest_unacked_by_notification",
ts,
ago.Seconds())
if err != nil {
slog.Errorln(err)
}
}
for alertName := range severityCounts {
ts := opentsdb.TagSet{"alert": alertName}
// The tagset of the alert is not included because there is no way to
// store the string of a group in OpenTSBD in a parsable way. This is
// because any delimiter we chose could also be part of a tag key or tag
// value.
for severity := range severityCounts[alertName] {
err := collect.Put("alerts.current_severity",
ts.Copy().Merge(opentsdb.TagSet{"severity": severity}),
severityCounts[alertName][severity])
if err != nil {
slog.Errorln(err)
}
err = collect.Put("alerts.last_abnormal_severity",
ts.Copy().Merge(opentsdb.TagSet{"severity": severity}),
abnormalCounts[alertName][severity])
if err != nil {
slog.Errorln(err)
}
}
err := collect.Put("alerts.acknowledgement_status",
ts.Copy().Merge(opentsdb.TagSet{"status": "unacknowledged"}),
ackStatusCounts[alertName][true])
err = collect.Put("alerts.acknowledgement_status",
ts.Copy().Merge(opentsdb.TagSet{"status": "acknowledged"}),
ackStatusCounts[alertName][false])
if err != nil {
slog.Errorln(err)
}
err = collect.Put("alerts.active_status",
ts.Copy().Merge(opentsdb.TagSet{"status": "active"}),
activeStatusCounts[alertName][true])
if err != nil {
slog.Errorln(err)
}
err = collect.Put("alerts.active_status",
ts.Copy().Merge(opentsdb.TagSet{"status": "inactive"}),
activeStatusCounts[alertName][false])
if err != nil {
slog.Errorln(err)
}
}
}
func (s *Schedule) GetUnknownAndUnevaluatedAlertKeys(alert string) (unknown, uneval []models.AlertKey) {
unknown, uneval, err := s.DataAccess.State().GetUnknownAndUnevalAlertKeys(alert)
if err != nil {
slog.Errorf("Error getting unknown/unevaluated alert keys: %s", err)
return nil, nil
}
return unknown, uneval
}
var bosunStartupTime = utcNow()
func (s *Schedule) findUnknownAlerts(now time.Time, alert string) []models.AlertKey {
keys := []models.AlertKey{}
if utcNow().Sub(bosunStartupTime) < s.SystemConf.GetCheckFrequency() {
return keys
}
if !s.AlertSuccessful(alert) {
return keys
}
a := s.RuleConf.GetAlert(alert)
t := a.Unknown
if t == 0 {
runEvery := s.SystemConf.GetDefaultRunEvery()
if a.RunEvery != 0 {
runEvery = a.RunEvery
}
t = s.SystemConf.GetCheckFrequency() * 2 * time.Duration(runEvery)
}
maxTouched := now.UTC().Unix() - int64(t.Seconds())
untouched, err := s.DataAccess.State().GetUntouchedSince(alert, maxTouched)
if err != nil {
slog.Errorf("Error finding unknown alerts for alert %s: %s.", alert, err)
return keys
}
for _, ak := range untouched {
if a.Squelch.Squelched(ak.Group()) {
continue
}
keys = append(keys, ak)
}
return keys
}
func (s *Schedule) CheckAlert(T miniprofiler.Timer, r *RunHistory, a *conf.Alert) (cancelled bool) {
slog.Infof("check alert %v start", a.Name)
start := utcNow()
for _, ak := range s.findUnknownAlerts(r.Start, a.Name) {
r.Events[ak] = &models.Event{Status: models.StUnknown}
}
var warns, crits models.AlertKeys
type res struct {
results *expr.Results
error error
}
// buffered channel so go func that runs executeExpr won't leak if the Check is cancelled
// by the closing of the schedule
rc := make(chan res, 1)
var d *expr.Results
var err error
go func() {
d, err := s.executeExpr(T, r, a, a.Depends)
rc <- res{d, err} // this will hang forever if the channel isn't buffered since nothing will ever receieve from rc
}()
select {
case res := <-rc:
d = res.results
err = res.error
// If the schedule closes before the expression has finised executing, we abandon the
// execution of the expression
case <-s.runnerContext.Done():
return true
}
var deps expr.ResultSlice
if err == nil {
deps = filterDependencyResults(d)
crits, err, cancelled = s.CheckExpr(T, r, a, a.Crit, models.StCritical, nil)
if err == nil && !cancelled {
warns, err, cancelled = s.CheckExpr(T, r, a, a.Warn, models.StWarning, crits)
}
}
if cancelled {
return true
}
unevalCount, unknownCount := markDependenciesUnevaluated(r.Events, deps, a.Name)
if err != nil {
slog.Errorf("Error checking alert %s: %s", a.Name, err.Error())
removeUnknownEvents(r.Events, a.Name)
s.markAlertError(a.Name, err)
} else {
s.markAlertSuccessful(a.Name)
}
collect.Put("check.duration", opentsdb.TagSet{"name": a.Name}, time.Since(start).Seconds())
slog.Infof("check alert %v done (%s): %v crits, %v warns, %v unevaluated, %v unknown", a.Name, time.Since(start), len(crits), len(warns), unevalCount, unknownCount)
return false
}
func removeUnknownEvents(evs map[models.AlertKey]*models.Event, alert string) {
for k, v := range evs {
if v.Status == models.StUnknown && k.Name() == alert {
delete(evs, k)
}
}
}
func filterDependencyResults(results *expr.Results) expr.ResultSlice {
// take the results of the dependency expression and filter it to
// non-zero tag sets.
filtered := expr.ResultSlice{}
if results == nil {
return filtered
}
for _, r := range results.Results {
var n float64
switch v := r.Value.(type) {
case expr.Number:
n = float64(v)
case expr.Scalar:
n = float64(v)
}
if !math.IsNaN(n) && n != 0 {
filtered = append(filtered, r)
}
}
return filtered
}
func markDependenciesUnevaluated(events map[models.AlertKey]*models.Event, deps expr.ResultSlice, alert string) (unevalCount, unknownCount int) {
for ak, ev := range events {
if ak.Name() != alert {
continue
}
for _, dep := range deps {
if dep.Group.Overlaps(ak.Group()) {
ev.Unevaluated = true
unevalCount++
}
if ev.Status == models.StUnknown {
unknownCount++
}
}
}
return unevalCount, unknownCount
}
func (s *Schedule) executeExpr(T miniprofiler.Timer, rh *RunHistory, a *conf.Alert, e *expr.Expr) (*expr.Results, error) {
if e == nil {
return nil, nil
}
providers := &expr.BosunProviders{
Cache: rh.Cache,
Search: s.Search,
Squelched: s.RuleConf.AlertSquelched(a),
History: s,
}
results, _, err := e.Execute(rh.Backends, providers, T, rh.Start, 0, a.UnjoinedOK)
return results, err
}
func (s *Schedule) CheckExpr(T miniprofiler.Timer, rh *RunHistory, a *conf.Alert, e *expr.Expr, checkStatus models.Status, ignore models.AlertKeys) (alerts models.AlertKeys, err error, cancelled bool) {
if e == nil {
return
}
defer func() {
if err == nil {
return
}
collect.Add("check.errs", opentsdb.TagSet{"metric": a.Name}, 1)
slog.Errorln(err)
}()
type res struct {
results *expr.Results
error error
}
// See s.CheckAlert for an explanation of execution and cancellation with this channel
rc := make(chan res, 1)
var results *expr.Results
go func() {
results, err := s.executeExpr(T, rh, a, e)
rc <- res{results, err}
}()
select {
case res := <-rc:
results = res.results
err = res.error
case <-s.runnerContext.Done():
return nil, nil, true
}
if err != nil {
return
}
Loop:
for _, r := range results.Results {
if s.RuleConf.Squelched(a, r.Group) {
continue
}
ak := models.NewAlertKey(a.Name, r.Group)
for _, v := range ignore {
if ak == v {
continue Loop
}
}
var n float64
n, err = valueToFloat(r.Value)
if err != nil {
return
}
event := rh.Events[ak]
if event == nil {
event = new(models.Event)
rh.Events[ak] = event
}
result := &models.Result{
Computations: r.Computations,
Value: models.Float(n),
Expr: e.String(),
}
switch checkStatus {
case models.StWarning:
event.Warn = result
case models.StCritical:
event.Crit = result
}
status := checkStatus
if math.IsNaN(n) {
status = checkStatus
} else if n == 0 {
status = models.StNormal
}
if status != models.StNormal {
alerts = append(alerts, ak)
}
if status > rh.Events[ak].Status {
event.Status = status
}
}
return
}
func valueToFloat(val expr.Value) (float64, error) {
var n float64
switch v := val.(type) {
case expr.Number:
n = float64(v)
case expr.Scalar:
n = float64(v)
default:
return 0, fmt.Errorf("expected number or scalar")
}
return n, nil
}