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// Copyright 2020 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package metric // import "miniflux.app/metric"
import (
"time"
"miniflux.app/logger"
"miniflux.app/storage"
"github.com/prometheus/client_golang/prometheus"
)
// Prometheus Metrics.
var (
BackgroundFeedRefreshDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Namespace: "miniflux",
Name: "background_feed_refresh_duration",
Help: "Processing time to refresh feeds from the background workers",
Buckets: prometheus.LinearBuckets(1, 2, 15),
},
[]string{"status"},
)
ScraperRequestDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Namespace: "miniflux",
Name: "scraper_request_duration",
Help: "Web scraper request duration",
Buckets: prometheus.LinearBuckets(1, 2, 25),
},
[]string{"status"},
)
ArchiveEntriesDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Namespace: "miniflux",
Name: "archive_entries_duration",
Help: "Archive entries duration",
Buckets: prometheus.LinearBuckets(1, 2, 30),
},
[]string{"status"},
)
usersGauge = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "users",
Help: "Number of users",
},
)
feedsGauge = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "feeds",
Help: "Number of feeds by status",
},
[]string{"status"},
)
brokenFeedsGauge = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "broken_feeds",
Help: "Number of broken feeds",
},
)
entriesGauge = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "entries",
Help: "Number of entries by status",
},
[]string{"status"},
)
)
// Collector represents a metric collector.
type Collector struct {
store *storage.Storage
refreshInterval int
}
// NewCollector initializes a new metric collector.
func NewCollector(store *storage.Storage, refreshInterval int) *Collector {
prometheus.MustRegister(BackgroundFeedRefreshDuration)
prometheus.MustRegister(ScraperRequestDuration)
prometheus.MustRegister(ArchiveEntriesDuration)
prometheus.MustRegister(usersGauge)
prometheus.MustRegister(feedsGauge)
prometheus.MustRegister(brokenFeedsGauge)
prometheus.MustRegister(entriesGauge)
return &Collector{store, refreshInterval}
}
// GatherStorageMetrics polls the database to fetch metrics.
func (c *Collector) GatherStorageMetrics() {
for range time.Tick(time.Duration(c.refreshInterval) * time.Second) {
logger.Debug("[Metric] Collecting database metrics")
usersGauge.Set(float64(c.store.CountUsers()))
brokenFeedsGauge.Set(float64(c.store.CountAllFeedsWithErrors()))
feedsCount := c.store.CountAllFeeds()
for status, count := range feedsCount {
feedsGauge.WithLabelValues(status).Set(float64(count))
}
entriesCount := c.store.CountAllEntries()
for status, count := range entriesCount {
entriesGauge.WithLabelValues(status).Set(float64(count))
}
}
}
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