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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>
This commit is contained in:
Chris O'Haver
2022-09-08 14:56:27 -04:00
committed by GitHub
parent 1f0a41a665
commit b56b080a7c
36 changed files with 880 additions and 114 deletions
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plugin/cache/README.md vendored
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@@ -85,14 +85,14 @@ Entries with 0 TTL will remain in the cache until randomly evicted when the shar
If monitoring is enabled (via the *prometheus* plugin) then the following metrics are exported:
* `coredns_cache_entries{server, type, zones}` - Total elements in the cache by cache type.
* `coredns_cache_hits_total{server, type, zones}` - Counter of cache hits by cache type.
* `coredns_cache_misses_total{server, zones}` - Counter of cache misses. - Deprecated, derive misses from cache hits/requests counters.
* `coredns_cache_requests_total{server, zones}` - Counter of cache requests.
* `coredns_cache_prefetch_total{server, zones}` - Counter of times the cache has prefetched a cached item.
* `coredns_cache_drops_total{server, zones}` - Counter of responses excluded from the cache due to request/response question name mismatch.
* `coredns_cache_served_stale_total{server, zones}` - Counter of requests served from stale cache entries.
* `coredns_cache_evictions_total{server, type, zones}` - Counter of cache evictions.
* `coredns_cache_entries{server, type, zones, view}` - Total elements in the cache by cache type.
* `coredns_cache_hits_total{server, type, zones, view}` - Counter of cache hits by cache type.
* `coredns_cache_misses_total{server, zones, view}` - Counter of cache misses. - Deprecated, derive misses from cache hits/requests counters.
* `coredns_cache_requests_total{server, zones, view}` - Counter of cache requests.
* `coredns_cache_prefetch_total{server, zones, view}` - Counter of times the cache has prefetched a cached item.
* `coredns_cache_drops_total{server, zones, view}` - Counter of responses excluded from the cache due to request/response question name mismatch.
* `coredns_cache_served_stale_total{server, zones, view}` - Counter of requests served from stale cache entries.
* `coredns_cache_evictions_total{server, type, zones, view}` - Counter of cache evictions.
Cache types are either "denial" or "success". `Server` is the server handling the request, see the
prometheus plugin for documentation.