b67bd722a9
The `root_ca_cert_publisher_sync_duration_seconds` metric tracks the sync duration in the root CA cert publisher per code and namespace. In clusters with a high namespace turnover (like CI clusters), this may cause the kube-controller-manager to expose over 100k series to Prometheus, which may cause degradation of that service. Drop the `namespace` label to remove the metrics' cardinality, tracking this metric by namespace does not justify the impact of keeping it.
98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
/*
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Copyright 2020 The Kubernetes 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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package rootcacertpublisher
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import (
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"errors"
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"strings"
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"testing"
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"time"
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corev1 "k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/component-base/metrics/legacyregistry"
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"k8s.io/component-base/metrics/testutil"
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)
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func TestSyncCounter(t *testing.T) {
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testCases := []struct {
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desc string
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err error
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metrics []string
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want string
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}{
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{
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desc: "nil error",
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err: nil,
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metrics: []string{
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"root_ca_cert_publisher_sync_total",
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},
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want: `
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# HELP root_ca_cert_publisher_sync_total [ALPHA] Number of namespace syncs happened in root ca cert publisher.
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# TYPE root_ca_cert_publisher_sync_total counter
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root_ca_cert_publisher_sync_total{code="200"} 1
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`,
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},
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{
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desc: "kube api error",
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err: apierrors.NewNotFound(corev1.Resource("configmap"), "test-configmap"),
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metrics: []string{
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"root_ca_cert_publisher_sync_total",
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},
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want: `
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# HELP root_ca_cert_publisher_sync_total [ALPHA] Number of namespace syncs happened in root ca cert publisher.
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# TYPE root_ca_cert_publisher_sync_total counter
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root_ca_cert_publisher_sync_total{code="404"} 1
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`,
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},
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{
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desc: "kube api error without code",
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err: &apierrors.StatusError{},
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metrics: []string{
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"root_ca_cert_publisher_sync_total",
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},
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want: `
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# HELP root_ca_cert_publisher_sync_total [ALPHA] Number of namespace syncs happened in root ca cert publisher.
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# TYPE root_ca_cert_publisher_sync_total counter
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root_ca_cert_publisher_sync_total{code="500"} 1
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`,
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},
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{
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desc: "general error",
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err: errors.New("test"),
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metrics: []string{
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"root_ca_cert_publisher_sync_total",
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},
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want: `
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# HELP root_ca_cert_publisher_sync_total [ALPHA] Number of namespace syncs happened in root ca cert publisher.
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# TYPE root_ca_cert_publisher_sync_total counter
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root_ca_cert_publisher_sync_total{code="500"} 1
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`,
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},
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}
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for _, tc := range testCases {
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t.Run(tc.desc, func(t *testing.T) {
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recordMetrics(time.Now(), tc.err)
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defer syncCounter.Reset()
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if err := testutil.GatherAndCompare(legacyregistry.DefaultGatherer, strings.NewReader(tc.want), tc.metrics...); err != nil {
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t.Fatal(err)
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}
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})
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}
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}
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