b56b080a7c
* introduce new interface "dnsserver.Viewer", that allows a plugin implementing it to decide if a query should be routed into its server block. * add new plugin "view", that uses the new interface to enable a user to define expression based conditions that must be met for a query to be routed to its server block. Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
67 lines
2.7 KiB
Go
67 lines
2.7 KiB
Go
package cache
|
|
|
|
import (
|
|
"github.com/coredns/coredns/plugin"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/client_golang/prometheus/promauto"
|
|
)
|
|
|
|
var (
|
|
// cacheSize is total elements in the cache by cache type.
|
|
cacheSize = promauto.NewGaugeVec(prometheus.GaugeOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "cache",
|
|
Name: "entries",
|
|
Help: "The number of elements in the cache.",
|
|
}, []string{"server", "type", "zones", "view"})
|
|
// cacheRequests is a counter of all requests through the cache.
|
|
cacheRequests = promauto.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "cache",
|
|
Name: "requests_total",
|
|
Help: "The count of cache requests.",
|
|
}, []string{"server", "zones", "view"})
|
|
// cacheHits is counter of cache hits by cache type.
|
|
cacheHits = promauto.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "cache",
|
|
Name: "hits_total",
|
|
Help: "The count of cache hits.",
|
|
}, []string{"server", "type", "zones", "view"})
|
|
// cacheMisses is the counter of cache misses. - Deprecated
|
|
cacheMisses = promauto.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "cache",
|
|
Name: "misses_total",
|
|
Help: "The count of cache misses. Deprecated, derive misses from cache hits/requests counters.",
|
|
}, []string{"server", "zones", "view"})
|
|
// cachePrefetches is the number of time the cache has prefetched a cached item.
|
|
cachePrefetches = promauto.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "cache",
|
|
Name: "prefetch_total",
|
|
Help: "The number of times the cache has prefetched a cached item.",
|
|
}, []string{"server", "zones", "view"})
|
|
// cacheDrops is the number responses that are not cached, because the reply is malformed.
|
|
cacheDrops = promauto.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "cache",
|
|
Name: "drops_total",
|
|
Help: "The number responses that are not cached, because the reply is malformed.",
|
|
}, []string{"server", "zones", "view"})
|
|
// servedStale is the number of requests served from stale cache entries.
|
|
servedStale = promauto.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "cache",
|
|
Name: "served_stale_total",
|
|
Help: "The number of requests served from stale cache entries.",
|
|
}, []string{"server", "zones", "view"})
|
|
// evictions is the counter of cache evictions.
|
|
evictions = promauto.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "cache",
|
|
Name: "evictions_total",
|
|
Help: "The count of cache evictions.",
|
|
}, []string{"server", "type", "zones", "view"})
|
|
)
|