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plugin/health: Bypass proxy in self health check (#5401)

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* add detail to docs; bypass proxy in self health check

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
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Chris O'Haver
2022-06-17 15:49:53 -04:00
committed by GitHub
parent dded10420b
commit 037e4920c2
2 changed files with 20 additions and 6 deletions
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plugin/health/README.md
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@@ -48,13 +48,13 @@ Doing this is supported but both endpoints ":8080" and ":8081" will export the e
## Metrics
If monitoring is enabled (via the *prometheus* plugin) then the following metric is exported:
If monitoring is enabled (via the *prometheus* plugin) then the following metrics are exported:
* `coredns_health_request_duration_seconds{}` - duration to process a HTTP query to the local
`/health` endpoint. As this a local operation it should be fast. A (large) increase in this
* `coredns_health_request_duration_seconds{}` - The *health* plugin performs a self health check
once per second on the `/health` endpoint. This metric is the duration to process that request.
As this is a local operation it should be fast. A (large) increase in this
duration indicates the CoreDNS process is having trouble keeping up with its query load.
* `coredns_health_request_failures_total{}` - The number of times the internal health check loop
failed to query `/health`.
* `coredns_health_request_failures_total{}` - The number of times the self health check failed.
Note that these metrics *do not* have a `server` label, because being overloaded is a symptom of
the running process, *not* a specific server.