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64 lines
2.2 KiB
Markdown
64 lines
2.2 KiB
Markdown
# prometheus
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*prometheus* enables [Prometheus](https://prometheus.io/) metrics.
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The default location for the metrics is `localhost:9153`. The metrics path is fixed to `/metrics`.
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The following metrics are exported:
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* `coredns_dns_request_count_total{zone, proto, family}` - total query count.
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* `coredns_dns_request_duration_seconds{zone}` - duration to process each query.
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* `coredns_dns_request_size_bytes{zone, proto}` - size of the request in bytes.
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* `coredns_dns_request_do_count_total{zone}` - queries that have the DO bit set
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* `coredns_dns_request_type_count_total{zone, type}` - counter of queries per zone and type.
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* `coredns_dns_response_size_bytes{zone, proto}` - response size in bytes.
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* `coredns_dns_response_rcode_count_total{zone, rcode}` - response per zone and rcode.
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Each counter has a label `zone` which is the zonename used for the request/response.
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Extra labels used are:
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* `proto` which holds the transport of the response ("udp" or "tcp")
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* The address family (`family`) of the transport (1 = IP (IP version 4), 2 = IP6 (IP version 6)).
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* `type` which holds the query type. It holds most common types (A, AAAA, MX, SOA, CNAME, PTR, TXT,
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NS, SRV, DS, DNSKEY, RRSIG, NSEC, NSEC3, IXFR, AXFR and ANY) and "other" which lumps together all
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other types.
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* The `response_rcode_count_total` has an extra label `rcode` which holds the rcode of the response.
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If monitoring is enabled, queries that do not enter the plugin chain are exported under the fake
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name "dropped" (without a closing dot - this is never a valid domain name).
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## Syntax
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~~~
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prometheus [ADDRESS]
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~~~
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For each zone that you want to see metrics for.
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It optionally takes an address to which the metrics are exported; the default
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is `localhost:9153`. The metrics path is fixed to `/metrics`.
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## Examples
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Use an alternative address:
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~~~ corefile
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. {
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prometheus localhost:9253
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}
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~~~
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Or via an enviroment variable (this is supported throughout the Corefile): `export PORT=9253`, and
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then:
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~~~ corefile
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. {
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prometheus localhost:{$PORT}
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}
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~~~
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# Bugs
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When reloading, we keep the handler running, meaning that any changes to the handler's address
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aren't picked up. You'll need to restart CoreDNS for that to happen.
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