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coredns/middleware/prometheus/README.md

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# prometheus
This module enables prometheus metrics for CoreDNS.
The following metrics are exported:
* coredns_dns_request_count_total
* coredns_dns_request_duration_seconds
* coredns_dns_response_size_bytes
* coredns_dns_response_rcode_count_total
Each counter has a label `zone` which is the zonename used for the request/response,
and a label `qtype` which old the query type.
The `response_rcode_count_total` has an extra label `rcode` which holds the rcode
of the response.
Restarting CoreDNS will stop the monitoring. This is a bug. Also [this upstream
Caddy bug](https://github.com/mholt/caddy/issues/675).
## Syntax
~~~
prometheus
~~~
For each zone that you want to see metrics for.
It optionally takes an address where the metrics are exported, the default
is `localhost:9135`. The metrics path is fixed to `/metrics`.
## Examples