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plugin/view: Advanced routing interface and new 'view' plugin (#5538)

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* 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>
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Chris O'Haver 2022-09-08 14:56:27 -04:00 • committed by GitHub
parent 1f0a41a665
commit b56b080a7c
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36 changed files with 880 additions and 114 deletions
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16
plugin/cache/metrics.go vendored
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@ -14,54 +14,54 @@ var (
Subsystem: "cache",
Name: "entries",
Help: "The number of elements in the cache.",
}, []string{"server", "type", "zones"})
}, []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"})
}, []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"})
}, []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"})
}, []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"})
}, []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"})
}, []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"})
}, []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"})
}, []string{"server", "type", "zones", "view"})
)