package imgcache

import (
	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promauto"
)

// The counts of what the image cache does, kept in memory as Prometheus
// counters. They are registered on Prometheus' default registry, which
// /metrics serves. Adding to one waits for nothing and makes no database
// call. Each counts for the whole process since it started.
//
//nolint:gochecknoglobals // Prometheus registers each counter once per process
var (
	cacheHits = promauto.NewCounter(prometheus.CounterOpts{
		Name: "pixa_cache_hits_total",
		Help: "Image requests served from the cache.",
	})
	cacheMisses = promauto.NewCounter(prometheus.CounterOpts{
		Name: "pixa_cache_misses_total",
		Help: "Image requests not served from the cache.",
	})
	upstreamFetches = promauto.NewCounter(prometheus.CounterOpts{
		Name: "pixa_upstream_fetches_total",
		Help: "Fetches of a source image from upstream that read any bytes.",
	})
	upstreamFetchBytes = promauto.NewCounter(prometheus.CounterOpts{
		Name: "pixa_upstream_fetch_bytes_total",
		Help: "Bytes read from upstream by fetches of source images.",
	})
	transforms = promauto.NewCounter(prometheus.CounterOpts{
		Name: "pixa_transforms_total",
		Help: "Images the image processor transformed.",
	})
)