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//
// Copyright 2022 The Sigstore 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 api
import (
"math"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"sigs.k8s.io/release-utils/version"
)
var (
MetricLatency = promauto.NewHistogramVec(prometheus.HistogramOpts{
Name: "timestamp_authority_api_latency",
Help: "API Latency on calls",
}, []string{"path", "code"})
MetricLatencySummary = promauto.NewSummaryVec(prometheus.SummaryOpts{
Name: "timestamp_authority_api_latency_summary",
Help: "API Latency on calls",
}, []string{"path", "code"})
MetricRequestLatency = promauto.NewHistogramVec(prometheus.HistogramOpts{
Name: "timestamp_authority_latency_by_api",
Help: "API Latency (in ns) by path and method",
Buckets: prometheus.ExponentialBucketsRange(
float64(time.Millisecond),
float64(4*time.Second),
10),
}, []string{"path", "method"})
MetricRequestCount = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "timestamp_authority_http_requests_total",
Help: "Total number of HTTP requests by status code, path, and method.",
}, []string{"code", "path", "method"})
MetricNTPLatency = promauto.NewHistogramVec(prometheus.HistogramOpts{
Name: "timestamp_authority_ntp_latency",
Help: "NTP request latency",
}, []string{"host"})
MetricNTPSyncCount = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "timestamp_authority_ntp_sync_total",
Help: "Total number of NTP requests against a remote server",
}, []string{"host", "failed"})
MetricNTPErrorCount = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "timestamp_authority_ntp_errors_total",
Help: "Total number of NTP related errors",
}, []string{"reason"})
_ = promauto.NewGaugeFunc(
prometheus.GaugeOpts{
Name: "timestamp_authority_certificate_valid_days_remaining",
Help: "Number of days remaining in validity period of signing certificate",
},
func() float64 {
// if api hasn't been initialized yet, then we can't know the validity period;
// so we return MaxFloat64 to not cause an alarm if someone fetches the metric
// before the initialization has completed
if api == nil {
return math.MaxFloat64
}
// compute minimum validity inclusive of leaf, any intermediates (if present), and root
minValidity := api.certChain[0].NotAfter
for _, cert := range api.certChain[1:] {
if cert.NotAfter.Before(minValidity) {
minValidity = cert.NotAfter
}
}
return time.Until(minValidity).Hours() / 24
})
_ = promauto.NewGaugeFunc(
prometheus.GaugeOpts{
Namespace: "timestamp_authority",
Name: "build_info",
Help: "A metric with a constant '1' value labeled by version, revision, branch, and goversion from which timestamp-authority was built.",
ConstLabels: prometheus.Labels{
"version": version.GetVersionInfo().GitVersion,
"revision": version.GetVersionInfo().GitCommit,
"build_date": version.GetVersionInfo().BuildDate,
"goversion": version.GetVersionInfo().GoVersion,
},
},
func() float64 { return 1 },
)
)
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