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threshold_rule.go
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threshold_rule.go
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package rules
import (
"bytes"
"context"
"encoding/json"
"fmt"
"math"
"net/url"
"regexp"
"sort"
"sync"
"text/template"
"time"
"unicode"
"go.uber.org/zap"
"github.com/ClickHouse/clickhouse-go/v2"
"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
"go.signoz.io/signoz/pkg/query-service/common"
"go.signoz.io/signoz/pkg/query-service/converter"
"go.signoz.io/signoz/pkg/query-service/postprocess"
"go.signoz.io/signoz/pkg/query-service/app/querier"
querierV2 "go.signoz.io/signoz/pkg/query-service/app/querier/v2"
"go.signoz.io/signoz/pkg/query-service/app/queryBuilder"
"go.signoz.io/signoz/pkg/query-service/constants"
"go.signoz.io/signoz/pkg/query-service/interfaces"
v3 "go.signoz.io/signoz/pkg/query-service/model/v3"
"go.signoz.io/signoz/pkg/query-service/utils/labels"
querytemplate "go.signoz.io/signoz/pkg/query-service/utils/queryTemplate"
"go.signoz.io/signoz/pkg/query-service/utils/times"
"go.signoz.io/signoz/pkg/query-service/utils/timestamp"
logsv3 "go.signoz.io/signoz/pkg/query-service/app/logs/v3"
"go.signoz.io/signoz/pkg/query-service/formatter"
yaml "gopkg.in/yaml.v2"
)
type ThresholdRule struct {
id string
name string
source string
ruleCondition *RuleCondition
// evalWindow is the time window used for evaluating the rule
// i.e each time we lookback from the current time, we look at data for the last
// evalWindow duration
evalWindow time.Duration
// holdDuration is the duration for which the alert waits before firing
holdDuration time.Duration
// holds the static set of labels and annotations for the rule
// these are the same for all alerts created for this rule
labels labels.Labels
annotations labels.Labels
// preferredChannels is the list of channels to send the alert to
// if the rule is triggered
preferredChannels []string
mtx sync.Mutex
// the time it took to evaluate the rule
evaluationDuration time.Duration
// the timestamp of the last evaluation
evaluationTimestamp time.Time
health RuleHealth
lastError error
// map of active alerts
active map[uint64]*Alert
// Ever since we introduced the new metrics query builder, the version is "v4"
// for all the rules
// if the version is "v3", then we use the old querier
// if the version is "v4", then we use the new querierV2
version string
// temporalityMap is a map of metric name to temporality
// to avoid fetching temporality for the same metric multiple times
// querying the v4 table on low cardinal temporality column
// should be fast but we can still avoid the query if we have the data in memory
temporalityMap map[string]map[v3.Temporality]bool
opts ThresholdRuleOpts
// lastTimestampWithDatapoints is the timestamp of the last datapoint we observed
// for this rule
// this is used for missing data alerts
lastTimestampWithDatapoints time.Time
// Type of the rule
// One of ["LOGS_BASED_ALERT", "TRACES_BASED_ALERT", "METRIC_BASED_ALERT", "EXCEPTIONS_BASED_ALERT"]
typ string
// querier is used for alerts created before the introduction of new metrics query builder
querier interfaces.Querier
// querierV2 is used for alerts created after the introduction of new metrics query builder
querierV2 interfaces.Querier
reader interfaces.Reader
evalDelay time.Duration
}
type ThresholdRuleOpts struct {
// sendUnmatched sends observed metric values
// even if they dont match the rule condition. this is
// useful in testing the rule
SendUnmatched bool
// sendAlways will send alert irresepective of resendDelay
// or other params
SendAlways bool
// EvalDelay is the time to wait for data to be available
// before evaluating the rule. This is useful in scenarios
// where data might not be available in the system immediately
// after the timestamp.
EvalDelay time.Duration
}
func NewThresholdRule(
id string,
p *PostableRule,
opts ThresholdRuleOpts,
featureFlags interfaces.FeatureLookup,
reader interfaces.Reader,
) (*ThresholdRule, error) {
zap.L().Info("creating new ThresholdRule", zap.String("id", id), zap.Any("opts", opts))
if p.RuleCondition == nil {
return nil, fmt.Errorf("no rule condition")
} else if !p.RuleCondition.IsValid() {
return nil, fmt.Errorf("invalid rule condition")
}
t := ThresholdRule{
id: id,
name: p.AlertName,
source: p.Source,
ruleCondition: p.RuleCondition,
evalWindow: time.Duration(p.EvalWindow),
labels: labels.FromMap(p.Labels),
annotations: labels.FromMap(p.Annotations),
preferredChannels: p.PreferredChannels,
health: HealthUnknown,
active: map[uint64]*Alert{},
opts: opts,
typ: p.AlertType,
version: p.Version,
temporalityMap: make(map[string]map[v3.Temporality]bool),
evalDelay: opts.EvalDelay,
}
if int64(t.evalWindow) == 0 {
t.evalWindow = 5 * time.Minute
}
querierOption := querier.QuerierOptions{
Reader: reader,
Cache: nil,
KeyGenerator: queryBuilder.NewKeyGenerator(),
FeatureLookup: featureFlags,
}
querierOptsV2 := querierV2.QuerierOptions{
Reader: reader,
Cache: nil,
KeyGenerator: queryBuilder.NewKeyGenerator(),
FeatureLookup: featureFlags,
}
t.querier = querier.NewQuerier(querierOption)
t.querierV2 = querierV2.NewQuerier(querierOptsV2)
t.reader = reader
zap.L().Info("creating new ThresholdRule", zap.String("name", t.name), zap.String("id", t.id))
return &t, nil
}
func (r *ThresholdRule) Name() string {
return r.name
}
func (r *ThresholdRule) ID() string {
return r.id
}
func (r *ThresholdRule) Condition() *RuleCondition {
return r.ruleCondition
}
func (r *ThresholdRule) GeneratorURL() string {
return prepareRuleGeneratorURL(r.ID(), r.source)
}
func (r *ThresholdRule) PreferredChannels() []string {
return r.preferredChannels
}
// targetVal returns the target value for the rule condition
// when the y-axis and target units are non-empty, it
// converts the target value to the y-axis unit
func (r *ThresholdRule) targetVal() float64 {
if r.ruleCondition == nil || r.ruleCondition.Target == nil {
return 0
}
// get the converter for the target unit
unitConverter := converter.FromUnit(converter.Unit(r.ruleCondition.TargetUnit))
// convert the target value to the y-axis unit
value := unitConverter.Convert(converter.Value{
F: *r.ruleCondition.Target,
U: converter.Unit(r.ruleCondition.TargetUnit),
}, converter.Unit(r.Unit()))
return value.F
}
func (r *ThresholdRule) matchType() MatchType {
if r.ruleCondition == nil {
return AtleastOnce
}
return r.ruleCondition.MatchType
}
func (r *ThresholdRule) compareOp() CompareOp {
if r.ruleCondition == nil {
return ValueIsEq
}
return r.ruleCondition.CompareOp
}
func (r *ThresholdRule) Type() RuleType {
return RuleTypeThreshold
}
func (r *ThresholdRule) SetLastError(err error) {
r.mtx.Lock()
defer r.mtx.Unlock()
r.lastError = err
}
func (r *ThresholdRule) LastError() error {
r.mtx.Lock()
defer r.mtx.Unlock()
return r.lastError
}
func (r *ThresholdRule) SetHealth(health RuleHealth) {
r.mtx.Lock()
defer r.mtx.Unlock()
r.health = health
}
func (r *ThresholdRule) Health() RuleHealth {
r.mtx.Lock()
defer r.mtx.Unlock()
return r.health
}
// SetEvaluationDuration updates evaluationDuration to the duration it took to evaluate the rule on its last evaluation.
func (r *ThresholdRule) SetEvaluationDuration(dur time.Duration) {
r.mtx.Lock()
defer r.mtx.Unlock()
r.evaluationDuration = dur
}
func (r *ThresholdRule) HoldDuration() time.Duration {
return r.holdDuration
}
func (r *ThresholdRule) EvalWindow() time.Duration {
return r.evalWindow
}
// Labels returns the labels of the alerting rule.
func (r *ThresholdRule) Labels() labels.BaseLabels {
return r.labels
}
// Annotations returns the annotations of the alerting rule.
func (r *ThresholdRule) Annotations() labels.BaseLabels {
return r.annotations
}
// GetEvaluationDuration returns the time in seconds it took to evaluate the alerting rule.
func (r *ThresholdRule) GetEvaluationDuration() time.Duration {
r.mtx.Lock()
defer r.mtx.Unlock()
return r.evaluationDuration
}
// SetEvaluationTimestamp updates evaluationTimestamp to the timestamp of when the rule was last evaluated.
func (r *ThresholdRule) SetEvaluationTimestamp(ts time.Time) {
r.mtx.Lock()
defer r.mtx.Unlock()
r.evaluationTimestamp = ts
}
// GetEvaluationTimestamp returns the time the evaluation took place.
func (r *ThresholdRule) GetEvaluationTimestamp() time.Time {
r.mtx.Lock()
defer r.mtx.Unlock()
return r.evaluationTimestamp
}
// State returns the maximum state of alert instances for this rule.
// StateFiring > StatePending > StateInactive
func (r *ThresholdRule) State() AlertState {
maxState := StateInactive
for _, a := range r.active {
if a.State > maxState {
maxState = a.State
}
}
return maxState
}
func (r *ThresholdRule) currentAlerts() []*Alert {
r.mtx.Lock()
defer r.mtx.Unlock()
alerts := make([]*Alert, 0, len(r.active))
for _, a := range r.active {
anew := *a
alerts = append(alerts, &anew)
}
return alerts
}
func (r *ThresholdRule) ActiveAlerts() []*Alert {
var res []*Alert
for _, a := range r.currentAlerts() {
if a.ResolvedAt.IsZero() {
res = append(res, a)
}
}
return res
}
func (r *ThresholdRule) FetchTemporality(ctx context.Context, metricNames []string, ch driver.Conn) (map[string]map[v3.Temporality]bool, error) {
metricNameToTemporality := make(map[string]map[v3.Temporality]bool)
query := fmt.Sprintf(`SELECT DISTINCT metric_name, temporality FROM %s.%s WHERE metric_name IN $1`, constants.SIGNOZ_METRIC_DBNAME, constants.SIGNOZ_TIMESERIES_v4_1DAY_TABLENAME)
rows, err := ch.Query(ctx, query, metricNames)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var metricName, temporality string
err := rows.Scan(&metricName, &temporality)
if err != nil {
return nil, err
}
if _, ok := metricNameToTemporality[metricName]; !ok {
metricNameToTemporality[metricName] = make(map[v3.Temporality]bool)
}
metricNameToTemporality[metricName][v3.Temporality(temporality)] = true
}
return metricNameToTemporality, nil
}
// populateTemporality same as addTemporality but for v4 and better
func (r *ThresholdRule) populateTemporality(ctx context.Context, qp *v3.QueryRangeParamsV3, ch driver.Conn) error {
missingTemporality := make([]string, 0)
metricNameToTemporality := make(map[string]map[v3.Temporality]bool)
if qp.CompositeQuery != nil && len(qp.CompositeQuery.BuilderQueries) > 0 {
for _, query := range qp.CompositeQuery.BuilderQueries {
// if there is no temporality specified in the query but we have it in the map
// then use the value from the map
if query.Temporality == "" && r.temporalityMap[query.AggregateAttribute.Key] != nil {
// We prefer delta if it is available
if r.temporalityMap[query.AggregateAttribute.Key][v3.Delta] {
query.Temporality = v3.Delta
} else if r.temporalityMap[query.AggregateAttribute.Key][v3.Cumulative] {
query.Temporality = v3.Cumulative
} else {
query.Temporality = v3.Unspecified
}
}
// we don't have temporality for this metric
if query.DataSource == v3.DataSourceMetrics && query.Temporality == "" {
missingTemporality = append(missingTemporality, query.AggregateAttribute.Key)
}
if _, ok := metricNameToTemporality[query.AggregateAttribute.Key]; !ok {
metricNameToTemporality[query.AggregateAttribute.Key] = make(map[v3.Temporality]bool)
}
}
}
var nameToTemporality map[string]map[v3.Temporality]bool
var err error
if len(missingTemporality) > 0 {
nameToTemporality, err = r.FetchTemporality(ctx, missingTemporality, ch)
if err != nil {
return err
}
}
if qp.CompositeQuery != nil && len(qp.CompositeQuery.BuilderQueries) > 0 {
for name := range qp.CompositeQuery.BuilderQueries {
query := qp.CompositeQuery.BuilderQueries[name]
if query.DataSource == v3.DataSourceMetrics && query.Temporality == "" {
if nameToTemporality[query.AggregateAttribute.Key][v3.Delta] {
query.Temporality = v3.Delta
} else if nameToTemporality[query.AggregateAttribute.Key][v3.Cumulative] {
query.Temporality = v3.Cumulative
} else {
query.Temporality = v3.Unspecified
}
r.temporalityMap[query.AggregateAttribute.Key] = nameToTemporality[query.AggregateAttribute.Key]
}
}
}
return nil
}
// ForEachActiveAlert runs the given function on each alert.
// This should be used when you want to use the actual alerts from the ThresholdRule
// and not on its copy.
// If you want to run on a copy of alerts then don't use this, get the alerts from 'ActiveAlerts()'.
func (r *ThresholdRule) ForEachActiveAlert(f func(*Alert)) {
r.mtx.Lock()
defer r.mtx.Unlock()
for _, a := range r.active {
f(a)
}
}
func (r *ThresholdRule) SendAlerts(ctx context.Context, ts time.Time, resendDelay time.Duration, interval time.Duration, notifyFunc NotifyFunc) {
alerts := []*Alert{}
r.ForEachActiveAlert(func(alert *Alert) {
if r.opts.SendAlways || alert.needsSending(ts, resendDelay) {
alert.LastSentAt = ts
// Allow for two Eval or Alertmanager send failures.
delta := resendDelay
if interval > resendDelay {
delta = interval
}
alert.ValidUntil = ts.Add(4 * delta)
anew := *alert
alerts = append(alerts, &anew)
} else {
zap.L().Debug("skipping send alert due to resend delay", zap.String("rule", r.Name()), zap.Any("alert", alert.Labels))
}
})
notifyFunc(ctx, "", alerts...)
}
func (r *ThresholdRule) Unit() string {
if r.ruleCondition != nil && r.ruleCondition.CompositeQuery != nil {
return r.ruleCondition.CompositeQuery.Unit
}
return ""
}
func (r *ThresholdRule) prepareQueryRange(ts time.Time) *v3.QueryRangeParamsV3 {
zap.L().Info("prepareQueryRange", zap.Int64("ts", ts.UnixMilli()), zap.Int64("evalWindow", r.evalWindow.Milliseconds()), zap.Int64("evalDelay", r.evalDelay.Milliseconds()))
start := ts.Add(-time.Duration(r.evalWindow)).UnixMilli()
end := ts.UnixMilli()
if r.evalDelay > 0 {
start = start - int64(r.evalDelay.Milliseconds())
end = end - int64(r.evalDelay.Milliseconds())
}
// round to minute otherwise we could potentially miss data
start = start - (start % (60 * 1000))
end = end - (end % (60 * 1000))
if r.ruleCondition.QueryType() == v3.QueryTypeClickHouseSQL {
params := &v3.QueryRangeParamsV3{
Start: start,
End: end,
Step: int64(math.Max(float64(common.MinAllowedStepInterval(start, end)), 60)),
CompositeQuery: &v3.CompositeQuery{
QueryType: r.ruleCondition.CompositeQuery.QueryType,
PanelType: r.ruleCondition.CompositeQuery.PanelType,
BuilderQueries: make(map[string]*v3.BuilderQuery),
ClickHouseQueries: make(map[string]*v3.ClickHouseQuery),
PromQueries: make(map[string]*v3.PromQuery),
Unit: r.ruleCondition.CompositeQuery.Unit,
},
Variables: make(map[string]interface{}, 0),
NoCache: true,
}
querytemplate.AssignReservedVarsV3(params)
for name, chQuery := range r.ruleCondition.CompositeQuery.ClickHouseQueries {
if chQuery.Disabled {
continue
}
tmpl := template.New("clickhouse-query")
tmpl, err := tmpl.Parse(chQuery.Query)
if err != nil {
zap.L().Error("failed to parse clickhouse query to populate vars", zap.String("ruleid", r.ID()), zap.Error(err))
r.SetHealth(HealthBad)
return params
}
var query bytes.Buffer
err = tmpl.Execute(&query, params.Variables)
if err != nil {
zap.L().Error("failed to populate clickhouse query", zap.String("ruleid", r.ID()), zap.Error(err))
r.SetHealth(HealthBad)
return params
}
params.CompositeQuery.ClickHouseQueries[name] = &v3.ClickHouseQuery{
Query: query.String(),
Disabled: chQuery.Disabled,
Legend: chQuery.Legend,
}
}
return params
}
if r.ruleCondition.CompositeQuery != nil && r.ruleCondition.CompositeQuery.BuilderQueries != nil {
for _, q := range r.ruleCondition.CompositeQuery.BuilderQueries {
// If the step interval is less than the minimum allowed step interval, set it to the minimum allowed step interval
if minStep := common.MinAllowedStepInterval(start, end); q.StepInterval < minStep {
q.StepInterval = minStep
}
}
}
if r.ruleCondition.CompositeQuery.PanelType != v3.PanelTypeGraph {
r.ruleCondition.CompositeQuery.PanelType = v3.PanelTypeGraph
}
// default mode
return &v3.QueryRangeParamsV3{
Start: start,
End: end,
Step: int64(math.Max(float64(common.MinAllowedStepInterval(start, end)), 60)),
CompositeQuery: r.ruleCondition.CompositeQuery,
Variables: make(map[string]interface{}, 0),
NoCache: true,
}
}
// The following function is used to prepare the where clause for the query
// `lbls` contains the key value pairs of the labels from the result of the query
// We iterate over the where clause and replace the labels with the actual values
// There are two cases:
// 1. The label is present in the where clause
// 2. The label is not present in the where clause
//
// Example for case 2:
// Latency by serviceName without any filter
// In this case, for each service with latency > threshold we send a notification
// The expectation will be that clicking on the related traces for service A, will
// take us to the traces page with the filter serviceName=A
// So for all the missing labels in the where clause, we add them as key = value
//
// Example for case 1:
// Severity text IN (WARN, ERROR)
// In this case, the Severity text will appear in the `lbls` if it were part of the group
// by clause, in which case we replace it with the actual value for the notification
// i.e Severity text = WARN
// If the Severity text is not part of the group by clause, then we add it as it is
func (r *ThresholdRule) fetchFilters(selectedQuery string, lbls labels.Labels) []v3.FilterItem {
var filterItems []v3.FilterItem
added := make(map[string]struct{})
if r.ruleCondition.CompositeQuery.QueryType == v3.QueryTypeBuilder &&
r.ruleCondition.CompositeQuery.BuilderQueries[selectedQuery] != nil &&
r.ruleCondition.CompositeQuery.BuilderQueries[selectedQuery].Filters != nil {
for _, item := range r.ruleCondition.CompositeQuery.BuilderQueries[selectedQuery].Filters.Items {
exists := false
for _, label := range lbls {
if item.Key.Key == label.Name {
// if the label is present in the where clause, replace it with key = value
filterItems = append(filterItems, v3.FilterItem{
Key: item.Key,
Operator: v3.FilterOperatorEqual,
Value: label.Value,
})
exists = true
added[label.Name] = struct{}{}
break
}
}
if !exists {
// if the label is not present in the where clause, add it as it is
filterItems = append(filterItems, item)
}
}
}
// add the labels which are not present in the where clause
for _, label := range lbls {
if _, ok := added[label.Name]; !ok {
filterItems = append(filterItems, v3.FilterItem{
Key: v3.AttributeKey{Key: label.Name},
Operator: v3.FilterOperatorEqual,
Value: label.Value,
})
}
}
return filterItems
}
func (r *ThresholdRule) prepareLinksToLogs(ts time.Time, lbls labels.Labels) string {
selectedQuery := r.GetSelectedQuery()
// TODO(srikanthccv): handle formula queries
if selectedQuery < "A" || selectedQuery > "Z" {
return ""
}
q := r.prepareQueryRange(ts)
// Logs list view expects time in milliseconds
tr := timeRange{
Start: q.Start,
End: q.End,
PageSize: 100,
}
options := Options{
MaxLines: 2,
Format: "list",
SelectColumns: []v3.AttributeKey{},
}
period, _ := json.Marshal(tr)
urlEncodedTimeRange := url.QueryEscape(string(period))
filterItems := r.fetchFilters(selectedQuery, lbls)
urlData := urlShareableCompositeQuery{
QueryType: string(v3.QueryTypeBuilder),
Builder: builderQuery{
QueryData: []v3.BuilderQuery{
{
DataSource: v3.DataSourceLogs,
QueryName: "A",
AggregateOperator: v3.AggregateOperatorNoOp,
AggregateAttribute: v3.AttributeKey{},
Filters: &v3.FilterSet{
Items: filterItems,
Operator: "AND",
},
Expression: "A",
Disabled: false,
Having: []v3.Having{},
StepInterval: 60,
OrderBy: []v3.OrderBy{
{
ColumnName: "timestamp",
Order: "desc",
},
},
},
},
QueryFormulas: make([]string, 0),
},
}
data, _ := json.Marshal(urlData)
compositeQuery := url.QueryEscape(string(data))
optionsData, _ := json.Marshal(options)
urlEncodedOptions := url.QueryEscape(string(optionsData))
return fmt.Sprintf("compositeQuery=%s&timeRange=%s&startTime=%d&endTime=%d&options=%s", compositeQuery, urlEncodedTimeRange, tr.Start, tr.End, urlEncodedOptions)
}
func (r *ThresholdRule) prepareLinksToTraces(ts time.Time, lbls labels.Labels) string {
selectedQuery := r.GetSelectedQuery()
// TODO(srikanthccv): handle formula queries
if selectedQuery < "A" || selectedQuery > "Z" {
return ""
}
q := r.prepareQueryRange(ts)
// Traces list view expects time in nanoseconds
tr := timeRange{
Start: q.Start * time.Second.Microseconds(),
End: q.End * time.Second.Microseconds(),
PageSize: 100,
}
options := Options{
MaxLines: 2,
Format: "list",
SelectColumns: constants.TracesListViewDefaultSelectedColumns,
}
period, _ := json.Marshal(tr)
urlEncodedTimeRange := url.QueryEscape(string(period))
filterItems := r.fetchFilters(selectedQuery, lbls)
urlData := urlShareableCompositeQuery{
QueryType: string(v3.QueryTypeBuilder),
Builder: builderQuery{
QueryData: []v3.BuilderQuery{
{
DataSource: v3.DataSourceTraces,
QueryName: "A",
AggregateOperator: v3.AggregateOperatorNoOp,
AggregateAttribute: v3.AttributeKey{},
Filters: &v3.FilterSet{
Items: filterItems,
Operator: "AND",
},
Expression: "A",
Disabled: false,
Having: []v3.Having{},
StepInterval: 60,
OrderBy: []v3.OrderBy{
{
ColumnName: "timestamp",
Order: "desc",
},
},
},
},
QueryFormulas: make([]string, 0),
},
}
data, _ := json.Marshal(urlData)
compositeQuery := url.QueryEscape(string(data))
optionsData, _ := json.Marshal(options)
urlEncodedOptions := url.QueryEscape(string(optionsData))
return fmt.Sprintf("compositeQuery=%s&timeRange=%s&startTime=%d&endTime=%d&options=%s", compositeQuery, urlEncodedTimeRange, tr.Start, tr.End, urlEncodedOptions)
}
func (r *ThresholdRule) hostFromSource() string {
parsedUrl, err := url.Parse(r.source)
if err != nil {
return ""
}
if parsedUrl.Port() != "" {
return fmt.Sprintf("%s://%s:%s", parsedUrl.Scheme, parsedUrl.Hostname(), parsedUrl.Port())
}
return fmt.Sprintf("%s://%s", parsedUrl.Scheme, parsedUrl.Hostname())
}
func (r *ThresholdRule) GetSelectedQuery() string {
if r.ruleCondition != nil {
if r.ruleCondition.SelectedQuery != "" {
return r.ruleCondition.SelectedQuery
}
queryNames := map[string]struct{}{}
if r.ruleCondition.CompositeQuery != nil {
if r.ruleCondition.QueryType() == v3.QueryTypeBuilder {
for name := range r.ruleCondition.CompositeQuery.BuilderQueries {
queryNames[name] = struct{}{}
}
} else if r.ruleCondition.QueryType() == v3.QueryTypeClickHouseSQL {
for name := range r.ruleCondition.CompositeQuery.ClickHouseQueries {
queryNames[name] = struct{}{}
}
}
}
// The following logic exists for backward compatibility
// If there is no selected query, then
// - check if F1 is present, if yes, return F1
// - else return the query with max ascii value
// this logic is not really correct. we should be considering
// whether the query is enabled or not. but this is a temporary
// fix to support backward compatibility
if _, ok := queryNames["F1"]; ok {
return "F1"
}
keys := make([]string, 0, len(queryNames))
for k := range queryNames {
keys = append(keys, k)
}
sort.Strings(keys)
return keys[len(keys)-1]
}
// This should never happen
return ""
}
func (r *ThresholdRule) buildAndRunQuery(ctx context.Context, ts time.Time, ch clickhouse.Conn) (Vector, error) {
if r.ruleCondition == nil || r.ruleCondition.CompositeQuery == nil {
r.SetHealth(HealthBad)
r.SetLastError(fmt.Errorf("no rule condition"))
return nil, fmt.Errorf("invalid rule condition")
}
params := r.prepareQueryRange(ts)
err := r.populateTemporality(ctx, params, ch)
if err != nil {
r.SetHealth(HealthBad)
zap.L().Error("failed to set temporality", zap.String("rule", r.Name()), zap.Error(err))
return nil, fmt.Errorf("internal error while setting temporality")
}
if params.CompositeQuery.QueryType == v3.QueryTypeBuilder {
// check if any enrichment is required for logs if yes then enrich them
if logsv3.EnrichmentRequired(params) {
// Note: Sending empty fields key because enrichment is only needed for json
// TODO: Add support for attribute enrichment later
logsv3.Enrich(params, map[string]v3.AttributeKey{})
}
}
var results []*v3.Result
var errQuriesByName map[string]error
if r.version == "v4" {
results, errQuriesByName, err = r.querierV2.QueryRange(ctx, params, map[string]v3.AttributeKey{})
} else {
results, errQuriesByName, err = r.querier.QueryRange(ctx, params, map[string]v3.AttributeKey{})
}
if err != nil {
zap.L().Error("failed to get alert query result", zap.String("rule", r.Name()), zap.Error(err), zap.Any("queries", errQuriesByName))
r.SetHealth(HealthBad)
return nil, fmt.Errorf("internal error while querying")
}
if params.CompositeQuery.QueryType == v3.QueryTypeBuilder {
results, err = postprocess.PostProcessResult(results, params)
if err != nil {
r.SetHealth(HealthBad)
zap.L().Error("failed to post process result", zap.String("rule", r.Name()), zap.Error(err))
return nil, fmt.Errorf("internal error while post processing")
}
}
selectedQuery := r.GetSelectedQuery()
var queryResult *v3.Result
for _, res := range results {
if res.QueryName == selectedQuery {
queryResult = res
break
}
}
if queryResult != nil && len(queryResult.Series) > 0 {
r.lastTimestampWithDatapoints = time.Now()
}
var resultVector Vector
// if the data is missing for `For` duration then we should send alert
if r.ruleCondition.AlertOnAbsent && r.lastTimestampWithDatapoints.Add(time.Duration(r.Condition().AbsentFor)*time.Minute).Before(time.Now()) {
zap.L().Info("no data found for rule condition", zap.String("ruleid", r.ID()))
lbls := labels.NewBuilder(labels.Labels{})
if !r.lastTimestampWithDatapoints.IsZero() {
lbls.Set("lastSeen", r.lastTimestampWithDatapoints.Format(constants.AlertTimeFormat))
}
resultVector = append(resultVector, Sample{
Metric: lbls.Labels(),
IsMissing: true,
})
return resultVector, nil
}
for _, series := range queryResult.Series {
smpl, shouldAlert := r.shouldAlert(*series)
if shouldAlert {
resultVector = append(resultVector, smpl)
}
}
return resultVector, nil
}
func normalizeLabelName(name string) string {
// See https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels
// Regular expression to match non-alphanumeric characters except underscores
reg := regexp.MustCompile(`[^a-zA-Z0-9_]`)
// Replace all non-alphanumeric characters except underscores with underscores
normalized := reg.ReplaceAllString(name, "_")
// If the first character is not a letter or an underscore, prepend an underscore
if len(normalized) > 0 && !unicode.IsLetter(rune(normalized[0])) && normalized[0] != '_' {
normalized = "_" + normalized
}
return normalized
}
func (r *ThresholdRule) Eval(ctx context.Context, ts time.Time, queriers *Queriers) (interface{}, error) {
prevState := r.State()
valueFormatter := formatter.FromUnit(r.Unit())
res, err := r.buildAndRunQuery(ctx, ts, queriers.Ch)
if err != nil {
r.SetHealth(HealthBad)
r.SetLastError(err)
zap.L().Error("failure in buildAndRunQuery", zap.String("ruleid", r.ID()), zap.Error(err))
return nil, err
}
r.mtx.Lock()
defer r.mtx.Unlock()
resultFPs := map[uint64]struct{}{}
var alerts = make(map[uint64]*Alert, len(res))
for _, smpl := range res {
l := make(map[string]string, len(smpl.Metric))
for _, lbl := range smpl.Metric {
l[lbl.Name] = lbl.Value
}
value := valueFormatter.Format(smpl.V, r.Unit())
threshold := valueFormatter.Format(r.targetVal(), r.Unit())
zap.L().Debug("Alert template data for rule", zap.String("name", r.Name()), zap.String("formatter", valueFormatter.Name()), zap.String("value", value), zap.String("threshold", threshold))
tmplData := AlertTemplateData(l, value, threshold)
// Inject some convenience variables that are easier to remember for users
// who are not used to Go's templating system.
defs := "{{$labels := .Labels}}{{$value := .Value}}{{$threshold := .Threshold}}"
// utility function to apply go template on labels and annotations
expand := func(text string) string {
tmpl := NewTemplateExpander(
ctx,
defs+text,
"__alert_"+r.Name(),
tmplData,
times.Time(timestamp.FromTime(ts)),
nil,
)
result, err := tmpl.Expand()
if err != nil {
result = fmt.Sprintf("<error expanding template: %s>", err)
zap.L().Error("Expanding alert template failed", zap.Error(err), zap.Any("data", tmplData))
}
return result
}
lb := labels.NewBuilder(smpl.Metric).Del(labels.MetricNameLabel).Del(labels.TemporalityLabel)
for _, l := range r.labels {
lb.Set(l.Name, expand(l.Value))
}
lb.Set(labels.AlertNameLabel, r.Name())
lb.Set(labels.AlertRuleIdLabel, r.ID())
lb.Set(labels.RuleSourceLabel, r.GeneratorURL())
annotations := make(labels.Labels, 0, len(r.annotations))
for _, a := range r.annotations {
annotations = append(annotations, labels.Label{Name: normalizeLabelName(a.Name), Value: expand(a.Value)})
}
if smpl.IsMissing {
lb.Set(labels.AlertNameLabel, "[No data] "+r.Name())
}
// Links with timestamps should go in annotations since labels
// is used alert grouping, and we want to group alerts with the same
// label set, but different timestamps, together.
if r.typ == "TRACES_BASED_ALERT" {
link := r.prepareLinksToTraces(ts, smpl.MetricOrig)
if link != "" && r.hostFromSource() != "" {
annotations = append(annotations, labels.Label{Name: "related_traces", Value: fmt.Sprintf("%s/traces-explorer?%s", r.hostFromSource(), link)})
}
} else if r.typ == "LOGS_BASED_ALERT" {
link := r.prepareLinksToLogs(ts, smpl.MetricOrig)
if link != "" && r.hostFromSource() != "" {
annotations = append(annotations, labels.Label{Name: "related_logs", Value: fmt.Sprintf("%s/logs/logs-explorer?%s", r.hostFromSource(), link)})
}
}
lbs := lb.Labels()
h := lbs.Hash()
resultFPs[h] = struct{}{}
if _, ok := alerts[h]; ok {
zap.L().Error("the alert query returns duplicate records", zap.String("ruleid", r.ID()), zap.Any("alert", alerts[h]))
err = fmt.Errorf("duplicate alert found, vector contains metrics with the same labelset after applying alert labels")
// We have already acquired the lock above hence using SetHealth and
// SetLastError will deadlock.
r.health = HealthBad
r.lastError = err
return nil, err