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* middleware/metrics: survive restart Keep the handler running during restart. Stopping and starting the handler results in "address in use" - sometimes, meaning the reload will be flaky. In turn this behavior means any changes to the monitor stanza are not picked up. * remove resync
54 lines
1.8 KiB
Markdown
54 lines
1.8 KiB
Markdown
# prometheus
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This module enables prometheus metrics for CoreDNS. The default location for the metrics is
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`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}
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* coredns_dns_request_duration_milliseconds{zone}
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* coredns_dns_request_size_bytes{zone, proto}
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* coredns_dns_request_do_count_total{zone}
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* coredns_dns_request_type_count_total{zone, type}
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* coredns_dns_response_size_bytes{zone, proto}
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* coredns_dns_response_rcode_count_total{zone, 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 middleware 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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~~~
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prometheus localhost:9253
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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 aren't picked
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up. You'll need to restart CoreDNS for that to happen.
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