minio/cmd/metrics-v2_test.go

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// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"testing"
"time"
"github.com/prometheus/client_golang/prometheus"
)
func TestGetHistogramMetrics(t *testing.T) {
histBuckets := []float64{0.05, 0.1, 0.25, 0.5, 0.75}
labels := []string{"GetObject", "PutObject", "CopyObject", "CompleteMultipartUpload"}
ttfbHist := prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "s3_ttfb_seconds",
Help: "Time taken by requests served by current MinIO server instance",
Buckets: histBuckets,
},
[]string{"api"},
)
observations := []struct {
val float64
label string
}{
{
val: 0.02,
label: labels[0],
},
{
val: 0.07,
label: labels[1],
},
{
val: 0.11,
label: labels[1],
},
{
val: 0.19,
label: labels[1],
},
{
val: 0.31,
label: labels[1],
},
{
val: 0.61,
label: labels[3],
},
{
val: 0.79,
label: labels[2],
},
}
ticker := time.NewTicker(1 * time.Millisecond)
defer ticker.Stop()
for _, obs := range observations {
// Send observations once every 1ms, to simulate delay between
// observations. This is to test the channel based
// synchronization used internally.
select {
case <-ticker.C:
ttfbHist.With(prometheus.Labels{"api": obs.label}).Observe(obs.val)
}
}
metrics := getHistogramMetrics(ttfbHist, getBucketTTFBDistributionMD(), false)
// additional labels for +Inf for all histogram metrics
if expPoints := len(labels) * (len(histBuckets) + 1); expPoints != len(metrics) {
t.Fatalf("Expected %v data points but got %v", expPoints, len(metrics))
}
}