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minio/cmd/metrics.go

186 lines
5.2 KiB

/*
* Minio Cloud Storage, (C) 2018 Minio, Inc.
*
* 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 cmd
import (
"context"
"net/http"
"github.com/minio/minio/cmd/logger"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
var (
httpRequestsDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "minio_http_requests_duration_seconds",
Help: "Time taken by requests served by current Minio server instance",
Buckets: []float64{.001, .003, .005, .1, .5, 1},
},
[]string{"request_type"},
)
)
func init() {
prometheus.MustRegister(httpRequestsDuration)
prometheus.MustRegister(newMinioCollector())
}
// newMinioCollector describes the collector
// and returns reference of minioCollector
// It creates the Prometheus Description which is used
// to define metric and help string
func newMinioCollector() *minioCollector {
return &minioCollector{
desc: prometheus.NewDesc("minio_stats", "Statistics exposed by Minio server", nil, nil),
}
}
// minioCollector is the Custom Collector
type minioCollector struct {
desc *prometheus.Desc
}
// Describe sends the super-set of all possible descriptors of metrics
func (c *minioCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- c.desc
}
// Collect is called by the Prometheus registry when collecting metrics.
func (c *minioCollector) Collect(ch chan<- prometheus.Metric) {
// Always expose network stats
// Network Sent/Received Bytes
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("minio", "network", "sent_bytes_total"),
"Total number of bytes sent by current Minio server instance",
nil, nil),
prometheus.CounterValue,
float64(globalConnStats.getTotalOutputBytes()),
)
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("minio", "network", "received_bytes_total"),
"Total number of bytes received by current Minio server instance",
nil, nil),
prometheus.CounterValue,
float64(globalConnStats.getTotalInputBytes()),
)
// Expose cache stats only if available
cacheObjLayer := newCacheObjectsFn()
if cacheObjLayer != nil {
cs := cacheObjLayer.StorageInfo(context.Background())
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("minio", "disk", "cache_storage_bytes"),
"Total cache capacity on current Minio server instance",
nil, nil),
prometheus.GaugeValue,
float64(cs.Total),
)
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("minio", "disk", "cache_storage_free_bytes"),
"Total cache available on current Minio server instance",
nil, nil),
prometheus.GaugeValue,
float64(cs.Free),
)
}
// Expose disk stats only if applicable
// Fetch disk space info
objLayer := newObjectLayerFn()
// Service not initialized yet
if objLayer == nil {
return
}
s := objLayer.StorageInfo(context.Background())
// Gateways don't provide disk info
if s.Backend.Type == Unknown {
return
}
var totalDisks, offlineDisks int
// Setting totalDisks to 1 and offlineDisks to 0 in FS mode
if s.Backend.Type == BackendFS {
totalDisks = 1
offlineDisks = 0
} else {
offlineDisks = s.Backend.OfflineDisks
totalDisks = s.Backend.OfflineDisks + s.Backend.OnlineDisks
}
// Total disk usage by current Minio server instance
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("minio", "disk", "storage_used_bytes"),
"Total disk storage used by current Minio server instance",
nil, nil),
prometheus.GaugeValue,
float64(s.Used),
)
// Minio Total Disk/Offline Disk
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("minio", "total", "disks"),
"Total number of disks for current Minio server instance",
nil, nil),
prometheus.GaugeValue,
float64(totalDisks),
)
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName("minio", "offline", "disks"),
"Total number of offline disks for current Minio server instance",
nil, nil),
prometheus.GaugeValue,
float64(offlineDisks),
)
}
func metricsHandler() http.Handler {
registry := prometheus.NewRegistry()
err := registry.Register(httpRequestsDuration)
logger.LogIf(context.Background(), err)
err = registry.Register(newMinioCollector())
logger.LogIf(context.Background(), 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,
}),
)
}