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prometheus/rules/alerting_test.go
Julien Pivotto 9adad8ad30 Remove MaxConcurrent from the PromQL engine opts (#6712) 
Since we use ActiveQueryTracker to check for concurrency in
d992c36b3a it does not make sense to keep
the MaxConcurrent value as an option of the PromQL engine.

This pull request removes it from the PromQL engine options, sets the
max concurrent metric to -1 if there is no active query tracker, and use
the value of the active query tracker otherwise.

It removes dead code and also will inform people who import the promql
package that we made that change, as it breaks the EngineOpts struct.

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
2020-01-28 20:38:49 +00:00

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// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rules
import (
"context"
"fmt"
"testing"
"time"
"github.com/go-kit/kit/log"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/pkg/timestamp"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/util/teststorage"
"github.com/prometheus/prometheus/util/testutil"
)
func TestAlertingRuleHTMLSnippet(t *testing.T) {
expr, err := promql.ParseExpr(`foo{html="<b>BOLD<b>"}`)
testutil.Ok(t, err)
rule := NewAlertingRule("testrule", expr, 0, labels.FromStrings("html", "<b>BOLD</b>"), labels.FromStrings("html", "<b>BOLD</b>"), nil, false, nil)
const want = `alert: <a href="/test/prefix/graph?g0.expr=ALERTS%7Balertname%3D%22testrule%22%7D&g0.tab=1">testrule</a>
expr: <a href="/test/prefix/graph?g0.expr=foo%7Bhtml%3D%22%3Cb%3EBOLD%3Cb%3E%22%7D&g0.tab=1">foo{html=&#34;&lt;b&gt;BOLD&lt;b&gt;&#34;}</a>
labels:
html: '&lt;b&gt;BOLD&lt;/b&gt;'
annotations:
html: '&lt;b&gt;BOLD&lt;/b&gt;'
`
got := rule.HTMLSnippet("/test/prefix")
testutil.Assert(t, want == got, "incorrect HTML snippet; want:\n\n|%v|\n\ngot:\n\n|%v|", want, got)
}
func TestAlertingRuleLabelsUpdate(t *testing.T) {
suite, err := promql.NewTest(t, `
load 1m
http_requests{job="app-server", instance="0"} 75 85 70 70
`)
testutil.Ok(t, err)
defer suite.Close()
testutil.Ok(t, suite.Run())
expr, err := promql.ParseExpr(`http_requests < 100`)
testutil.Ok(t, err)
rule := NewAlertingRule(
"HTTPRequestRateLow",
expr,
time.Minute,
// Basing alerting rule labels off of a value that can change is a very bad idea.
// If an alert is going back and forth between two label values it will never fire.
// Instead, you should write two alerts with constant labels.
labels.FromStrings("severity", "{{ if lt $value 80.0 }}critical{{ else }}warning{{ end }}"),
nil, nil, true, nil,
)
results := []promql.Vector{
{
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "HTTPRequestRateLow",
"alertstate", "pending",
"instance", "0",
"job", "app-server",
"severity", "critical",
),
Point: promql.Point{V: 1},
},
},
{
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "HTTPRequestRateLow",
"alertstate", "pending",
"instance", "0",
"job", "app-server",
"severity", "warning",
),
Point: promql.Point{V: 1},
},
},
{
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "HTTPRequestRateLow",
"alertstate", "pending",
"instance", "0",
"job", "app-server",
"severity", "critical",
),
Point: promql.Point{V: 1},
},
},
{
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "HTTPRequestRateLow",
"alertstate", "firing",
"instance", "0",
"job", "app-server",
"severity", "critical",
),
Point: promql.Point{V: 1},
},
},
}
baseTime := time.Unix(0, 0)
for i, result := range results {
t.Logf("case %d", i)
evalTime := baseTime.Add(time.Duration(i) * time.Minute)
result[0].Point.T = timestamp.FromTime(evalTime)
res, err := rule.Eval(suite.Context(), evalTime, EngineQueryFunc(suite.QueryEngine(), suite.Storage()), nil)
testutil.Ok(t, err)
var filteredRes promql.Vector // After removing 'ALERTS_FOR_STATE' samples.
for _, smpl := range res {
smplName := smpl.Metric.Get("__name__")
if smplName == "ALERTS" {
filteredRes = append(filteredRes, smpl)
} else {
// If not 'ALERTS', it has to be 'ALERTS_FOR_STATE'.
testutil.Equals(t, "ALERTS_FOR_STATE", smplName)
}
}
testutil.Equals(t, result, filteredRes)
}
}
func TestAlertingRuleExternalLabelsInTemplate(t *testing.T) {
suite, err := promql.NewTest(t, `
load 1m
http_requests{job="app-server", instance="0"} 75 85 70 70
`)
testutil.Ok(t, err)
defer suite.Close()
testutil.Ok(t, suite.Run())
expr, err := promql.ParseExpr(`http_requests < 100`)
testutil.Ok(t, err)
ruleWithoutExternalLabels := NewAlertingRule(
"ExternalLabelDoesNotExist",
expr,
time.Minute,
labels.FromStrings("templated_label", "There are {{ len $externalLabels }} external Labels, of which foo is {{ $externalLabels.foo }}."),
nil,
nil,
true, log.NewNopLogger(),
)
ruleWithExternalLabels := NewAlertingRule(
"ExternalLabelExists",
expr,
time.Minute,
labels.FromStrings("templated_label", "There are {{ len $externalLabels }} external Labels, of which foo is {{ $externalLabels.foo }}."),
nil,
labels.FromStrings("foo", "bar", "dings", "bums"),
true, log.NewNopLogger(),
)
result := promql.Vector{
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "ExternalLabelDoesNotExist",
"alertstate", "pending",
"instance", "0",
"job", "app-server",
"templated_label", "There are 0 external Labels, of which foo is .",
),
Point: promql.Point{V: 1},
},
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "ExternalLabelExists",
"alertstate", "pending",
"instance", "0",
"job", "app-server",
"templated_label", "There are 2 external Labels, of which foo is bar.",
),
Point: promql.Point{V: 1},
},
}
evalTime := time.Unix(0, 0)
result[0].Point.T = timestamp.FromTime(evalTime)
result[1].Point.T = timestamp.FromTime(evalTime)
var filteredRes promql.Vector // After removing 'ALERTS_FOR_STATE' samples.
res, err := ruleWithoutExternalLabels.Eval(
suite.Context(), evalTime, EngineQueryFunc(suite.QueryEngine(), suite.Storage()), nil,
)
testutil.Ok(t, err)
for _, smpl := range res {
smplName := smpl.Metric.Get("__name__")
if smplName == "ALERTS" {
filteredRes = append(filteredRes, smpl)
} else {
// If not 'ALERTS', it has to be 'ALERTS_FOR_STATE'.
testutil.Equals(t, "ALERTS_FOR_STATE", smplName)
}
}
res, err = ruleWithExternalLabels.Eval(
suite.Context(), evalTime, EngineQueryFunc(suite.QueryEngine(), suite.Storage()), nil,
)
testutil.Ok(t, err)
for _, smpl := range res {
smplName := smpl.Metric.Get("__name__")
if smplName == "ALERTS" {
filteredRes = append(filteredRes, smpl)
} else {
// If not 'ALERTS', it has to be 'ALERTS_FOR_STATE'.
testutil.Equals(t, "ALERTS_FOR_STATE", smplName)
}
}
testutil.Equals(t, result, filteredRes)
}
func TestAlertingRuleEmptyLabelFromTemplate(t *testing.T) {
suite, err := promql.NewTest(t, `
load 1m
http_requests{job="app-server", instance="0"} 75 85 70 70
`)
testutil.Ok(t, err)
defer suite.Close()
testutil.Ok(t, suite.Run())
expr, err := promql.ParseExpr(`http_requests < 100`)
testutil.Ok(t, err)
rule := NewAlertingRule(
"EmptyLabel",
expr,
time.Minute,
labels.FromStrings("empty_label", ""),
nil,
nil,
true, log.NewNopLogger(),
)
result := promql.Vector{
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "EmptyLabel",
"alertstate", "pending",
"instance", "0",
"job", "app-server",
),
Point: promql.Point{V: 1},
},
}
evalTime := time.Unix(0, 0)
result[0].Point.T = timestamp.FromTime(evalTime)
var filteredRes promql.Vector // After removing 'ALERTS_FOR_STATE' samples.
res, err := rule.Eval(
suite.Context(), evalTime, EngineQueryFunc(suite.QueryEngine(), suite.Storage()), nil,
)
testutil.Ok(t, err)
for _, smpl := range res {
smplName := smpl.Metric.Get("__name__")
if smplName == "ALERTS" {
filteredRes = append(filteredRes, smpl)
} else {
// If not 'ALERTS', it has to be 'ALERTS_FOR_STATE'.
testutil.Equals(t, "ALERTS_FOR_STATE", smplName)
}
}
testutil.Equals(t, result, filteredRes)
}
func TestAlertingRuleDuplicate(t *testing.T) {
storage := teststorage.New(t)
defer storage.Close()
opts := promql.EngineOpts{
Logger: nil,
Reg: nil,
MaxSamples: 10,
Timeout: 10 * time.Second,
}
engine := promql.NewEngine(opts)
ctx, cancelCtx := context.WithCancel(context.Background())
defer cancelCtx()
now := time.Now()
expr, _ := promql.ParseExpr(`vector(0) or label_replace(vector(0),"test","x","","")`)
rule := NewAlertingRule(
"foo",
expr,
time.Minute,
labels.FromStrings("test", "test"),
nil,
nil,
true, log.NewNopLogger(),
)
_, err := rule.Eval(ctx, now, EngineQueryFunc(engine, storage), nil)
testutil.NotOk(t, err)
e := fmt.Errorf("vector contains metrics with the same labelset after applying alert labels")
testutil.ErrorEqual(t, e, err)
}
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