706 lines
19 KiB
Go
706 lines
19 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rules
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import (
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"context"
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"math"
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"sort"
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"testing"
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"time"
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"github.com/go-kit/kit/log"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/pkg/labels"
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"github.com/prometheus/prometheus/pkg/timestamp"
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"github.com/prometheus/prometheus/pkg/value"
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"github.com/prometheus/prometheus/promql"
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"github.com/prometheus/prometheus/storage"
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"github.com/prometheus/prometheus/util/testutil"
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)
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func TestAlertingRule(t *testing.T) {
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suite, err := promql.NewTest(t, `
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load 5m
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http_requests{job="app-server", instance="0", group="canary", severity="overwrite-me"} 75 85 95 105 105 95 85
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http_requests{job="app-server", instance="1", group="canary", severity="overwrite-me"} 80 90 100 110 120 130 140
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`)
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testutil.Ok(t, err)
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defer suite.Close()
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err = suite.Run()
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testutil.Ok(t, err)
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expr, err := promql.ParseExpr(`http_requests{group="canary", job="app-server"} < 100`)
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testutil.Ok(t, err)
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rule := NewAlertingRule(
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"HTTPRequestRateLow",
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expr,
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time.Minute,
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labels.FromStrings("severity", "{{\"c\"}}ritical"),
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nil, true, nil,
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)
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result := promql.Vector{
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{
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Metric: labels.FromStrings(
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"__name__", "ALERTS",
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"alertname", "HTTPRequestRateLow",
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"alertstate", "pending",
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"group", "canary",
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"instance", "0",
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"job", "app-server",
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"severity", "critical",
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),
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Point: promql.Point{V: 1},
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},
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{
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Metric: labels.FromStrings(
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"__name__", "ALERTS",
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"alertname", "HTTPRequestRateLow",
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"alertstate", "pending",
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"group", "canary",
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"instance", "1",
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"job", "app-server",
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"severity", "critical",
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),
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Point: promql.Point{V: 1},
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},
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{
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Metric: labels.FromStrings(
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"__name__", "ALERTS",
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"alertname", "HTTPRequestRateLow",
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"alertstate", "firing",
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"group", "canary",
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"instance", "0",
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"job", "app-server",
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"severity", "critical",
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),
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Point: promql.Point{V: 1},
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},
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{
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Metric: labels.FromStrings(
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"__name__", "ALERTS",
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"alertname", "HTTPRequestRateLow",
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"alertstate", "firing",
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"group", "canary",
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"instance", "1",
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"job", "app-server",
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"severity", "critical",
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),
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Point: promql.Point{V: 1},
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},
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}
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baseTime := time.Unix(0, 0)
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var tests = []struct {
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time time.Duration
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result promql.Vector
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}{
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{
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time: 0,
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result: result[:2],
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}, {
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time: 5 * time.Minute,
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result: result[2:],
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}, {
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time: 10 * time.Minute,
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result: result[2:3],
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},
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{
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time: 15 * time.Minute,
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result: nil,
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},
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{
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time: 20 * time.Minute,
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result: nil,
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},
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{
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time: 25 * time.Minute,
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result: result[:1],
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},
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{
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time: 30 * time.Minute,
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result: result[2:3],
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},
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}
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for i, test := range tests {
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t.Logf("case %d", i)
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evalTime := baseTime.Add(test.time)
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res, err := rule.Eval(suite.Context(), evalTime, EngineQueryFunc(suite.QueryEngine(), suite.Storage()), nil)
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testutil.Ok(t, err)
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var filteredRes promql.Vector // After removing 'ALERTS_FOR_STATE' samples.
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for _, smpl := range res {
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smplName := smpl.Metric.Get("__name__")
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if smplName == "ALERTS" {
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filteredRes = append(filteredRes, smpl)
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} else {
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// If not 'ALERTS', it has to be 'ALERTS_FOR_STATE'.
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testutil.Equals(t, smplName, "ALERTS_FOR_STATE")
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}
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}
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for i := range test.result {
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test.result[i].T = timestamp.FromTime(evalTime)
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}
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testutil.Assert(t, len(test.result) == len(filteredRes), "%d. Number of samples in expected and actual output don't match (%d vs. %d)", i, len(test.result), len(res))
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sort.Slice(filteredRes, func(i, j int) bool {
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return labels.Compare(filteredRes[i].Metric, filteredRes[j].Metric) < 0
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})
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testutil.Equals(t, test.result, filteredRes)
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for _, aa := range rule.ActiveAlerts() {
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testutil.Assert(t, aa.Labels.Get(model.MetricNameLabel) == "", "%s label set on active alert: %s", model.MetricNameLabel, aa.Labels)
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}
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}
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}
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func TestForStateAddSamples(t *testing.T) {
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suite, err := promql.NewTest(t, `
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load 5m
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http_requests{job="app-server", instance="0", group="canary", severity="overwrite-me"} 75 85 95 105 105 95 85
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http_requests{job="app-server", instance="1", group="canary", severity="overwrite-me"} 80 90 100 110 120 130 140
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`)
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testutil.Ok(t, err)
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defer suite.Close()
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err = suite.Run()
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testutil.Ok(t, err)
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expr, err := promql.ParseExpr(`http_requests{group="canary", job="app-server"} < 100`)
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testutil.Ok(t, err)
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rule := NewAlertingRule(
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"HTTPRequestRateLow",
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expr,
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time.Minute,
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labels.FromStrings("severity", "{{\"c\"}}ritical"),
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nil, true, nil,
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)
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result := promql.Vector{
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{
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Metric: labels.FromStrings(
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"__name__", "ALERTS_FOR_STATE",
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"alertname", "HTTPRequestRateLow",
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"group", "canary",
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"instance", "0",
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"job", "app-server",
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"severity", "critical",
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),
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Point: promql.Point{V: 1},
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},
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{
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Metric: labels.FromStrings(
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"__name__", "ALERTS_FOR_STATE",
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"alertname", "HTTPRequestRateLow",
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"group", "canary",
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"instance", "1",
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"job", "app-server",
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"severity", "critical",
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),
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Point: promql.Point{V: 1},
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},
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{
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Metric: labels.FromStrings(
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"__name__", "ALERTS_FOR_STATE",
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"alertname", "HTTPRequestRateLow",
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"group", "canary",
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"instance", "0",
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"job", "app-server",
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"severity", "critical",
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),
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Point: promql.Point{V: 1},
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},
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{
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Metric: labels.FromStrings(
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"__name__", "ALERTS_FOR_STATE",
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"alertname", "HTTPRequestRateLow",
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"group", "canary",
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"instance", "1",
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"job", "app-server",
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"severity", "critical",
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),
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Point: promql.Point{V: 1},
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},
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}
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baseTime := time.Unix(0, 0)
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var tests = []struct {
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time time.Duration
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result promql.Vector
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persistThisTime bool // If true, it means this 'time' is persisted for 'for'.
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}{
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{
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time: 0,
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result: append(promql.Vector{}, result[:2]...),
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persistThisTime: true,
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},
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{
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time: 5 * time.Minute,
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result: append(promql.Vector{}, result[2:]...),
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},
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{
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time: 10 * time.Minute,
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result: append(promql.Vector{}, result[2:3]...),
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},
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{
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time: 15 * time.Minute,
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result: nil,
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},
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{
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time: 20 * time.Minute,
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result: nil,
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},
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{
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time: 25 * time.Minute,
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result: append(promql.Vector{}, result[:1]...),
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persistThisTime: true,
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},
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{
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time: 30 * time.Minute,
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result: append(promql.Vector{}, result[2:3]...),
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},
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}
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var forState float64
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for i, test := range tests {
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t.Logf("case %d", i)
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evalTime := baseTime.Add(test.time)
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if test.persistThisTime {
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forState = float64(evalTime.Unix())
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}
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if test.result == nil {
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forState = float64(value.StaleNaN)
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}
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res, err := rule.Eval(suite.Context(), evalTime, EngineQueryFunc(suite.QueryEngine(), suite.Storage()), nil)
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testutil.Ok(t, err)
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var filteredRes promql.Vector // After removing 'ALERTS' samples.
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for _, smpl := range res {
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smplName := smpl.Metric.Get("__name__")
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if smplName == "ALERTS_FOR_STATE" {
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filteredRes = append(filteredRes, smpl)
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} else {
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// If not 'ALERTS_FOR_STATE', it has to be 'ALERTS'.
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testutil.Equals(t, smplName, "ALERTS")
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}
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}
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for i := range test.result {
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test.result[i].T = timestamp.FromTime(evalTime)
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// Updating the expected 'for' state.
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if test.result[i].V >= 0 {
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test.result[i].V = forState
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}
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}
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testutil.Assert(t, len(test.result) == len(filteredRes), "%d. Number of samples in expected and actual output don't match (%d vs. %d)", i, len(test.result), len(res))
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sort.Slice(filteredRes, func(i, j int) bool {
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return labels.Compare(filteredRes[i].Metric, filteredRes[j].Metric) < 0
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})
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testutil.Equals(t, test.result, filteredRes)
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for _, aa := range rule.ActiveAlerts() {
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testutil.Assert(t, aa.Labels.Get(model.MetricNameLabel) == "", "%s label set on active alert: %s", model.MetricNameLabel, aa.Labels)
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}
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}
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}
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// sortAlerts sorts `[]*Alert` w.r.t. the Labels.
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func sortAlerts(items []*Alert) {
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sort.Slice(items, func(i, j int) bool {
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return labels.Compare(items[i].Labels, items[j].Labels) <= 0
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})
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}
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func TestForStateRestore(t *testing.T) {
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suite, err := promql.NewTest(t, `
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load 5m
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http_requests{job="app-server", instance="0", group="canary", severity="overwrite-me"} 75 85 50 0 0 25 0 0 40 0 120
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http_requests{job="app-server", instance="1", group="canary", severity="overwrite-me"} 125 90 60 0 0 25 0 0 40 0 130
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`)
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testutil.Ok(t, err)
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defer suite.Close()
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err = suite.Run()
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testutil.Ok(t, err)
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expr, err := promql.ParseExpr(`http_requests{group="canary", job="app-server"} < 100`)
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testutil.Ok(t, err)
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opts := &ManagerOptions{
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QueryFunc: EngineQueryFunc(suite.QueryEngine(), suite.Storage()),
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Appendable: suite.Storage(),
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TSDB: suite.Storage(),
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Context: context.Background(),
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Logger: log.NewNopLogger(),
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NotifyFunc: func(ctx context.Context, expr string, alerts ...*Alert) {},
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OutageTolerance: 30 * time.Minute,
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ForGracePeriod: 10 * time.Minute,
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}
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alertForDuration := 25 * time.Minute
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// Initial run before prometheus goes down.
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rule := NewAlertingRule(
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"HTTPRequestRateLow",
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expr,
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alertForDuration,
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labels.FromStrings("severity", "critical"),
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nil, true, nil,
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)
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group := NewGroup("default", "", time.Second, []Rule{rule}, true, opts)
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groups := make(map[string]*Group)
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groups["default;"] = group
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initialRuns := []time.Duration{0, 5 * time.Minute}
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baseTime := time.Unix(0, 0)
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for _, duration := range initialRuns {
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evalTime := baseTime.Add(duration)
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group.Eval(suite.Context(), evalTime)
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}
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exp := rule.ActiveAlerts()
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for _, aa := range exp {
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testutil.Assert(t, aa.Labels.Get(model.MetricNameLabel) == "", "%s label set on active alert: %s", model.MetricNameLabel, aa.Labels)
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}
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sort.Slice(exp, func(i, j int) bool {
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return labels.Compare(exp[i].Labels, exp[j].Labels) < 0
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})
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// Prometheus goes down here. We create new rules and groups.
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type testInput struct {
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restoreDuration time.Duration
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alerts []*Alert
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num int
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noRestore bool
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gracePeriod bool
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downDuration time.Duration
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}
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tests := []testInput{
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{
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// Normal restore (alerts were not firing).
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restoreDuration: 15 * time.Minute,
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alerts: rule.ActiveAlerts(),
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downDuration: 10 * time.Minute,
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},
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{
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// Testing Outage Tolerance.
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restoreDuration: 40 * time.Minute,
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noRestore: true,
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num: 2,
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},
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{
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// No active alerts.
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restoreDuration: 50 * time.Minute,
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alerts: []*Alert{},
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},
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}
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testFunc := func(tst testInput) {
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newRule := NewAlertingRule(
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"HTTPRequestRateLow",
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expr,
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alertForDuration,
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labels.FromStrings("severity", "critical"),
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nil, false, nil,
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)
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newGroup := NewGroup("default", "", time.Second, []Rule{newRule}, true, opts)
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newGroups := make(map[string]*Group)
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newGroups["default;"] = newGroup
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restoreTime := baseTime.Add(tst.restoreDuration)
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// First eval before restoration.
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newGroup.Eval(suite.Context(), restoreTime)
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// Restore happens here.
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newGroup.RestoreForState(restoreTime)
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got := newRule.ActiveAlerts()
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for _, aa := range got {
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testutil.Assert(t, aa.Labels.Get(model.MetricNameLabel) == "", "%s label set on active alert: %s", model.MetricNameLabel, aa.Labels)
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}
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sort.Slice(got, func(i, j int) bool {
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return labels.Compare(got[i].Labels, got[j].Labels) < 0
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})
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// Checking if we have restored it correctly.
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if tst.noRestore {
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testutil.Equals(t, tst.num, len(got))
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for _, e := range got {
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testutil.Equals(t, e.ActiveAt, restoreTime)
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}
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} else if tst.gracePeriod {
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testutil.Equals(t, tst.num, len(got))
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for _, e := range got {
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testutil.Equals(t, opts.ForGracePeriod, e.ActiveAt.Add(alertForDuration).Sub(restoreTime))
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}
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} else {
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exp := tst.alerts
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testutil.Equals(t, len(exp), len(got))
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sortAlerts(exp)
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sortAlerts(got)
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for i, e := range exp {
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testutil.Equals(t, e.Labels, got[i].Labels)
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// Difference in time should be within 1e6 ns, i.e. 1ms
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// (due to conversion between ns & ms, float64 & int64).
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activeAtDiff := float64(e.ActiveAt.Unix() + int64(tst.downDuration/time.Second) - got[i].ActiveAt.Unix())
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testutil.Assert(t, math.Abs(activeAtDiff) == 0, "'for' state restored time is wrong")
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}
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}
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}
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for _, tst := range tests {
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testFunc(tst)
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}
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// Testing the grace period.
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for _, duration := range []time.Duration{10 * time.Minute, 15 * time.Minute, 20 * time.Minute} {
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evalTime := baseTime.Add(duration)
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group.Eval(suite.Context(), evalTime)
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}
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testFunc(testInput{
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restoreDuration: 25 * time.Minute,
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alerts: []*Alert{},
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gracePeriod: true,
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num: 2,
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})
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}
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func TestStaleness(t *testing.T) {
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storage := testutil.NewStorage(t)
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defer storage.Close()
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engine := promql.NewEngine(nil, nil, 10, 10*time.Second)
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opts := &ManagerOptions{
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QueryFunc: EngineQueryFunc(engine, storage),
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Appendable: storage,
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TSDB: storage,
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Context: context.Background(),
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Logger: log.NewNopLogger(),
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}
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expr, err := promql.ParseExpr("a + 1")
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testutil.Ok(t, err)
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rule := NewRecordingRule("a_plus_one", expr, labels.Labels{})
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group := NewGroup("default", "", time.Second, []Rule{rule}, true, opts)
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// A time series that has two samples and then goes stale.
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app, _ := storage.Appender()
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app.Add(labels.FromStrings(model.MetricNameLabel, "a"), 0, 1)
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app.Add(labels.FromStrings(model.MetricNameLabel, "a"), 1000, 2)
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app.Add(labels.FromStrings(model.MetricNameLabel, "a"), 2000, math.Float64frombits(value.StaleNaN))
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err = app.Commit()
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testutil.Ok(t, err)
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ctx := context.Background()
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|
// Execute 3 times, 1 second apart.
|
|
group.Eval(ctx, time.Unix(0, 0))
|
|
group.Eval(ctx, time.Unix(1, 0))
|
|
group.Eval(ctx, time.Unix(2, 0))
|
|
|
|
querier, err := storage.Querier(context.Background(), 0, 2000)
|
|
testutil.Ok(t, err)
|
|
defer querier.Close()
|
|
|
|
matcher, err := labels.NewMatcher(labels.MatchEqual, model.MetricNameLabel, "a_plus_one")
|
|
testutil.Ok(t, err)
|
|
|
|
set, err := querier.Select(nil, matcher)
|
|
testutil.Ok(t, err)
|
|
|
|
samples, err := readSeriesSet(set)
|
|
testutil.Ok(t, err)
|
|
|
|
metric := labels.FromStrings(model.MetricNameLabel, "a_plus_one").String()
|
|
metricSample, ok := samples[metric]
|
|
|
|
testutil.Assert(t, ok, "Series %s not returned.", metric)
|
|
testutil.Assert(t, value.IsStaleNaN(metricSample[2].V), "Appended second sample not as expected. Wanted: stale NaN Got: %x", math.Float64bits(metricSample[2].V))
|
|
metricSample[2].V = 42 // reflect.DeepEqual cannot handle NaN.
|
|
|
|
want := map[string][]promql.Point{
|
|
metric: []promql.Point{{0, 2}, {1000, 3}, {2000, 42}},
|
|
}
|
|
|
|
testutil.Equals(t, want, samples)
|
|
}
|
|
|
|
// Convert a SeriesSet into a form useable with reflect.DeepEqual.
|
|
func readSeriesSet(ss storage.SeriesSet) (map[string][]promql.Point, error) {
|
|
result := map[string][]promql.Point{}
|
|
|
|
for ss.Next() {
|
|
series := ss.At()
|
|
|
|
points := []promql.Point{}
|
|
it := series.Iterator()
|
|
for it.Next() {
|
|
t, v := it.At()
|
|
points = append(points, promql.Point{T: t, V: v})
|
|
}
|
|
|
|
name := series.Labels().String()
|
|
result[name] = points
|
|
}
|
|
return result, ss.Err()
|
|
}
|
|
|
|
func TestCopyState(t *testing.T) {
|
|
oldGroup := &Group{
|
|
rules: []Rule{
|
|
NewAlertingRule("alert", nil, 0, nil, nil, true, nil),
|
|
NewRecordingRule("rule1", nil, nil),
|
|
NewRecordingRule("rule2", nil, nil),
|
|
NewRecordingRule("rule3", nil, nil),
|
|
NewRecordingRule("rule3", nil, nil),
|
|
},
|
|
seriesInPreviousEval: []map[string]labels.Labels{
|
|
map[string]labels.Labels{"a": nil},
|
|
map[string]labels.Labels{"r1": nil},
|
|
map[string]labels.Labels{"r2": nil},
|
|
map[string]labels.Labels{"r3a": nil},
|
|
map[string]labels.Labels{"r3b": nil},
|
|
},
|
|
evaluationDuration: time.Second,
|
|
}
|
|
oldGroup.rules[0].(*AlertingRule).active[42] = nil
|
|
newGroup := &Group{
|
|
rules: []Rule{
|
|
NewRecordingRule("rule3", nil, nil),
|
|
NewRecordingRule("rule3", nil, nil),
|
|
NewRecordingRule("rule3", nil, nil),
|
|
NewAlertingRule("alert", nil, 0, nil, nil, true, nil),
|
|
NewRecordingRule("rule1", nil, nil),
|
|
NewRecordingRule("rule4", nil, nil),
|
|
},
|
|
seriesInPreviousEval: make([]map[string]labels.Labels, 6),
|
|
}
|
|
newGroup.CopyState(oldGroup)
|
|
|
|
want := []map[string]labels.Labels{
|
|
map[string]labels.Labels{"r3a": nil},
|
|
map[string]labels.Labels{"r3b": nil},
|
|
nil,
|
|
map[string]labels.Labels{"a": nil},
|
|
map[string]labels.Labels{"r1": nil},
|
|
nil,
|
|
}
|
|
testutil.Equals(t, want, newGroup.seriesInPreviousEval)
|
|
testutil.Equals(t, oldGroup.rules[0], newGroup.rules[3])
|
|
testutil.Equals(t, oldGroup.evaluationDuration, newGroup.evaluationDuration)
|
|
}
|
|
|
|
func TestUpdate(t *testing.T) {
|
|
files := []string{"fixtures/rules.yaml"}
|
|
expected := map[string]labels.Labels{
|
|
"test": labels.FromStrings("name", "value"),
|
|
}
|
|
storage := testutil.NewStorage(t)
|
|
defer storage.Close()
|
|
engine := promql.NewEngine(nil, nil, 10, 10*time.Second)
|
|
ruleManager := NewManager(&ManagerOptions{
|
|
Appendable: storage,
|
|
TSDB: storage,
|
|
QueryFunc: EngineQueryFunc(engine, storage),
|
|
Context: context.Background(),
|
|
Logger: log.NewNopLogger(),
|
|
})
|
|
ruleManager.Run()
|
|
defer ruleManager.Stop()
|
|
|
|
err := ruleManager.Update(10*time.Second, files)
|
|
testutil.Ok(t, err)
|
|
testutil.Assert(t, len(ruleManager.groups) > 0, "expected non-empty rule groups")
|
|
for _, g := range ruleManager.groups {
|
|
g.seriesInPreviousEval = []map[string]labels.Labels{
|
|
expected,
|
|
}
|
|
}
|
|
|
|
err = ruleManager.Update(10*time.Second, files)
|
|
testutil.Ok(t, err)
|
|
for _, g := range ruleManager.groups {
|
|
for _, actual := range g.seriesInPreviousEval {
|
|
testutil.Equals(t, expected, actual)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestNotify(t *testing.T) {
|
|
storage := testutil.NewStorage(t)
|
|
defer storage.Close()
|
|
engine := promql.NewEngine(nil, nil, 10, 10*time.Second)
|
|
var lastNotified []*Alert
|
|
notifyFunc := func(ctx context.Context, expr string, alerts ...*Alert) {
|
|
lastNotified = alerts
|
|
}
|
|
opts := &ManagerOptions{
|
|
QueryFunc: EngineQueryFunc(engine, storage),
|
|
Appendable: storage,
|
|
TSDB: storage,
|
|
Context: context.Background(),
|
|
Logger: log.NewNopLogger(),
|
|
NotifyFunc: notifyFunc,
|
|
ResendDelay: 2 * time.Second,
|
|
}
|
|
|
|
expr, err := promql.ParseExpr("a > 1")
|
|
testutil.Ok(t, err)
|
|
rule := NewAlertingRule("aTooHigh", expr, 0, labels.Labels{}, labels.Labels{}, true, log.NewNopLogger())
|
|
group := NewGroup("alert", "", time.Second, []Rule{rule}, true, opts)
|
|
|
|
app, _ := storage.Appender()
|
|
app.Add(labels.FromStrings(model.MetricNameLabel, "a"), 1000, 2)
|
|
app.Add(labels.FromStrings(model.MetricNameLabel, "a"), 2000, 3)
|
|
app.Add(labels.FromStrings(model.MetricNameLabel, "a"), 5000, 3)
|
|
app.Add(labels.FromStrings(model.MetricNameLabel, "a"), 6000, 0)
|
|
|
|
err = app.Commit()
|
|
testutil.Ok(t, err)
|
|
|
|
ctx := context.Background()
|
|
|
|
// Alert sent right away
|
|
group.Eval(ctx, time.Unix(1, 0))
|
|
testutil.Equals(t, 1, len(lastNotified))
|
|
testutil.Assert(t, !lastNotified[0].ValidUntil.IsZero(), "ValidUntil should not be zero")
|
|
|
|
// Alert is not sent 1s later
|
|
group.Eval(ctx, time.Unix(2, 0))
|
|
testutil.Equals(t, 0, len(lastNotified))
|
|
|
|
// Alert is resent at t=5s
|
|
group.Eval(ctx, time.Unix(5, 0))
|
|
testutil.Equals(t, 1, len(lastNotified))
|
|
|
|
// Resolution alert sent right away
|
|
group.Eval(ctx, time.Unix(6, 0))
|
|
testutil.Equals(t, 1, len(lastNotified))
|
|
}
|