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metrics.go
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/
metrics.go
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// Copyright (c) 2020 MinIO, Inc.
//
// 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 main
import (
"net/http"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.uber.org/atomic"
)
func init() {
prometheus.MustRegister(newSidekickCollector())
}
// newSidekickCollector describes the collector
// and returns reference of sidekickCollector
// It creates the Prometheus Description which is used
// to define metric and help string
func newSidekickCollector() *sidekickCollector {
return &sidekickCollector{
desc: prometheus.NewDesc("sidekick_stats", "Statistics exposed by Sidekick loadbalancer", nil, nil),
}
}
// sidekickCollector is the Custom Collector
type sidekickCollector struct {
desc *prometheus.Desc
}
// Describe sends the super-set of all possible descriptors of metrics
func (c *sidekickCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- c.desc
}
// Collect is called by the Prometheus registry when collecting metrics.
func (c *sidekickCollector) Collect(ch chan<- prometheus.Metric) {
for _, c := range *globalConnStats.Load() {
if c == nil {
continue
}
// total calls per node
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("sidekick", "requests", "total"),
"Total number of calls in current SideKick server instance",
[]string{"endpoint"}, nil),
prometheus.CounterValue,
float64(c.totalCalls.Load()),
c.endpoint,
)
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("sidekick", "errors", "total"),
"Total number of failed calls in current SideKick server instance",
[]string{"endpoint"}, nil),
prometheus.CounterValue,
float64(c.totalFailedCalls.Load()),
c.endpoint,
)
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("sidekick", "rx", "bytes_total"),
"Total number of bytes received by current SideKick server instance",
[]string{"endpoint"}, nil),
prometheus.CounterValue,
float64(c.getTotalInputBytes()),
c.endpoint,
)
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("sidekick", "tx", "bytes_total"),
"Total number of bytes sent by current SideKick server instance",
[]string{"endpoint"}, nil),
prometheus.CounterValue,
float64(c.getTotalOutputBytes()),
c.endpoint,
)
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("sidekick", "health", "error_counts"),
"Total number of health check errors",
[]string{"endpoint"}, nil),
prometheus.CounterValue,
float64(c.getHealthErrorCount()),
c.endpoint,
)
}
}
func metricsHandler() (http.Handler, error) {
registry := prometheus.NewRegistry()
err := registry.Register(newSidekickCollector())
if err != nil {
return nil, err
}
gatherers := prometheus.Gatherers{
prometheus.DefaultGatherer,
registry,
}
// Delegate http serving to Prometheus client library, which will call collector.Collect.
return promhttp.InstrumentMetricHandler(
registry,
promhttp.HandlerFor(gatherers,
promhttp.HandlerOpts{
ErrorHandling: promhttp.ContinueOnError,
}),
), nil
}
// ConnStats - statistics on backend
type ConnStats struct {
endpoint string
totalInputBytes atomic.Uint64
totalOutputBytes atomic.Uint64
totalCalls atomic.Uint64
totalFailedCalls atomic.Uint64
minLatency atomic.Duration
maxLatency atomic.Duration
healthErrorCounts atomic.Uint64
}
// Store current total input bytes
func (s *ConnStats) setInputBytes(n int64) {
s.totalInputBytes.Store(uint64(n))
}
// Add current health error count
func (s *ConnStats) addHealthErrorCounts(n int64) {
s.healthErrorCounts.Add(uint64(n))
}
// Store current total output bytes
func (s *ConnStats) setOutputBytes(n int64) {
s.totalOutputBytes.Store(uint64(n))
}
// Return total input bytes
func (s *ConnStats) getTotalInputBytes() uint64 {
return s.totalInputBytes.Load()
}
// Store current total calls
func (s *ConnStats) setTotalCalls(n int64) {
s.totalCalls.Store(uint64(n))
}
// Store current total call failures
func (s *ConnStats) setTotalCallFailures(n int64) {
s.totalFailedCalls.Store(uint64(n))
}
// set min latency
func (s *ConnStats) setMinLatency(mn time.Duration) {
s.minLatency.Store(mn)
}
// set max latency
func (s *ConnStats) setMaxLatency(mx time.Duration) {
s.maxLatency.Store(mx)
}
// Return total output bytes
func (s *ConnStats) getTotalOutputBytes() uint64 {
return s.totalOutputBytes.Load()
}
// Return total health error count
func (s *ConnStats) getHealthErrorCount() uint64 {
return s.healthErrorCounts.Load()
}
// Prepare new ConnStats structure
func newConnStats(endpoint string) *ConnStats {
return &ConnStats{endpoint: endpoint}
}