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coredns/middleware/metrics
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Miek Gieben db6c9a3f01 middleware/metrics: fix crash on startup (#318) 
Make the methods that handle Metrics all use pointer receivers to fix
sync.Once not being initialized.

Finish the setup_test to test for failures. And make the check for the
address more strict and return an error when it does not have a port
number.

Add a toplevel test that starts a CoreDNS server with metrics enabled
so we catch these errors in the future.
2016-10-04 11:05:04 +01:00
..
handler.go middleware/metrics: fix crash on startup (#318) 2016-10-04 11:05:04 +01:00
metrics.go middleware/metrics: fix crash on startup (#318) 2016-10-04 11:05:04 +01:00
README.md Update README.md 2016-08-22 14:29:50 -07:00
setup.go middleware/metrics: fix crash on startup (#318) 2016-10-04 11:05:04 +01:00
setup_test.go middleware/metrics: fix crash on startup (#318) 2016-10-04 11:05:04 +01:00

README.md

prometheus

This module enables prometheus metrics for CoreDNS. The default location for the metrics is localhost:9153. The metrics path is fixed to /metrics.

The following metrics are exported:

  • coredns_dns_request_count_total{zone, proto, family}
  • coredns_dns_request_duration_milliseconds{zone}
  • coredns_dns_request_size_bytes{zone,, proto}
  • coredns_dns_request_transfer_size_bytes{zone,, proto}
  • coredns_dns_request_do_count_total{zone}
  • coredns_dns_request_type_count_total{zone, type}
  • coredns_dns_response_size_bytes{zone, proto}
  • coredns_dns_response_transfer_size_bytes{zone, proto}
  • coredns_dns_response_rcode_count_total{zone, rcode}

Each counter has a label zone which is the zonename used for the request/response.

Extra labels used are:

  • proto which holds the transport of the response ("udp" or "tcp")
  • The address family (family) of the transport (1 = IP (IP version 4), 2 = IP6 (IP version 6)).
  • type which holds the query type. It holds most common types (A, AAAA, MX, SOA, CNAME, PTR, TXT, NS, SRV, DS, DNSKEY, RRSIG, NSEC, NSEC3, IXFR, AXFR and ANY) and "other" which lumps together all other types.
  • The response_rcode_count_total has an extra label rcode which holds the rcode of the response.

If monitoring is enabled, queries that do not enter the middleware chain are exported under the fake domain "dropped" (without a closing dot).

Restarting CoreDNS will stop the monitoring. This is a bug. Also this upstream Caddy bug.

Syntax

prometheus

For each zone that you want to see metrics for.

It optionally takes an address to which the metrics are exported; the default is localhost:9153. The metrics path is fixed to /metrics.

Examples