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package vars
import (
"github.com/coredns/coredns/middleware"
"github.com/prometheus/client_golang/prometheus"
)
// Request* and Response* are the prometheus counters and gauges we are using for exporting metrics.
var (
RequestCount = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Name: "request_count_total",
Help: "Counter of DNS requests made per zone, protocol and family.",
}, []string{"zone", "proto", "family"})
RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Name: "request_duration_milliseconds",
Buckets: append(prometheus.DefBuckets, []float64{50, 100, 200, 500, 1000, 2000, 3000, 4000, 5000, 10000}...),
Help: "Histogram of the time (in milliseconds) each request took.",
}, []string{"zone"})
RequestSize = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Name: "request_size_bytes",
Help: "Size of the EDNS0 UDP buffer in bytes (64K for TCP).",
Buckets: []float64{0, 100, 200, 300, 400, 511, 1023, 2047, 4095, 8291, 16e3, 32e3, 48e3, 64e3},
}, []string{"zone", "proto"})
RequestDo = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Name: "request_do_count_total",
Help: "Counter of DNS requests with DO bit set per zone.",
}, []string{"zone"})
RequestType = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Name: "request_type_count_total",
Help: "Counter of DNS requests per type, per zone.",
}, []string{"zone", "type"})
ResponseSize = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Name: "response_size_bytes",
Help: "Size of the returned response in bytes.",
Buckets: []float64{0, 100, 200, 300, 400, 511, 1023, 2047, 4095, 8291, 16e3, 32e3, 48e3, 64e3},
}, []string{"zone", "proto"})
ResponseRcode = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Name: "response_rcode_count_total",
Help: "Counter of response status codes.",
}, []string{"zone", "rcode"})
)
const (
subsystem = "dns"
// Dropped indicates we dropped the query before any handling. It has no closing dot, so it can not be a valid zone.
Dropped = "dropped"
)
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