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Author SHA1 Message Date
Matt Bostock e758260986 Marathon SD: Set port index label 
The changes [1][] to Marathon service discovery to support multiple
ports mean that Prometheus now attempts to scrape all ports belonging to
a Marathon service.

You can use port definition or port mapping labels to filter out which
ports to scrape but that requires service owners to update their
Marathon configuration.

To allow for a smoother migration path, add a
`__meta_marathon_port_index` label, whose value is set to the port's
sequential index integer. For example, PORT0 has the value `0`, PORT1
has the value `1`, and so on.

This allows you to support scraping both the first available port (the
previous behaviour) in addition to ports with a `metrics` label.

For example, here's the relabel configuration we might use with
this patch:

    - action: keep
      source_labels: ['__meta_marathon_port_definition_label_metrics', '__meta_marathon_port_mapping_label_metrics', '__meta_marathon_port_index']
      # Keep if port mapping or definition has a 'metrics' label with any
      # non-empty value, or if no 'metrics' port label exists but this is the
      # service's first available port
      regex: ([^;]+;;[^;]+|;[^;]+;[^;]+|;;0)

This assumes that the Marathon API returns the ports in sorted order
(matching PORT0, PORT1, etc), which it appears that it does.

[1]: https://github.com/prometheus/prometheus/pull/2506
 2017-09-11 13:40:51 +01:00
Chris Goller 42de0ae013 Use log.Logger interface for all discovery services 2017-06-01 11:25:55 -05:00
Conor Broderick 6766123f93 Replace regex with Secret type and remarshal config to hide secrets (#2775) 2017-05-29 12:46:23 +01:00
Robson Roberto Souza Peixoto cc3e859d9e Add support for multiple ports in Marathon (#2506) 
- create a target for every port
- add meta labels for Marathon labels in portMappings and portDefinitions
 2017-03-18 22:10:44 +02:00
Tobias Schmidt 7bde44e98e Remove testing.T usage in goroutines 
The staticcheck warns about testing.T usage in goroutines. Moving the
t.Fatal* calls to the main thread showed immediately that this is a good
practice, as one of the test setups didn't work.
 2017-03-16 23:40:46 -03:00
Tobias Schmidt 58cd39aacd Follow golang naming conventions in discovery packages 2017-03-16 23:40:46 -03:00
Michael Kraus 690b49e503 Fix marathon tests 2017-03-06 11:36:55 +01:00
Michael Kraus 31252cc1b5 Clarify explicit use of authorization header 2017-03-06 11:36:36 +01:00
Michael Kraus 47bdcf0f67 Allow the use of bearer_token or bearer_token_file for MarathonSD 2017-03-02 09:44:20 +01:00
Fabian Reinartz d19d1bcad3 discovery: move into top-level package 2016-11-22 12:56:33 +01:00