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plugin/forward: add hit/miss metrics for connection cache (#4114)

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Signed-off-by: Ruslan Drozhdzh <rdrozhdzh@infoblox.com>
This commit is contained in:
Ruslan Drozhdzh
2020-09-14 12:42:55 +03:00
committed by GitHub
parent 2fe5d684f9
commit 30a4a87eaa
3 changed files with 18 additions and 2 deletions
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6
plugin/forward/README.md
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@@ -112,10 +112,12 @@ If monitoring is enabled (via the *prometheus* plugin) then the following metric
* `coredns_forward_healthcheck_failures_total{to}` - number of failed health checks per upstream.
* `coredns_forward_healthcheck_broken_total{}` - counter of when all upstreams are unhealthy,
and we are randomly (this always uses the `random` policy) spraying to an upstream.
* `max_concurrent_rejects_total{}` - counter of the number of queries rejected because the
* `coredns_forward_max_concurrent_rejects_total{}` - counter of the number of queries rejected because the
number of concurrent queries were at maximum.
* `coredns_forward_conn_cache_hits_total{to, proto}` - counter of connection cache hits per upstream and protocol.
* `coredns_forward_conn_cache_misses_total{to, proto}` - counter of connection cache misses per upstream and protocol.
Where `to` is one of the upstream servers (**TO** from the config), `rcode` is the returned RCODE
from the upstream.
from the upstream, `proto` is the transport protocol like `udp`, `tcp`, `tcp-tls`.
## Examples