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container collectors scrape their own telemetry and push it up their hop

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atlas 2026-10-28 22:01:33 +01:00 • committed by mara
commit 73c966a7eb
1 changed files with 163 additions and 49 deletions
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32
nix/module-eval/lib.nix
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@ -208,6 +208,37 @@ let
# the two tier cases differ only in which receiver they hand it.
carriesJournaldSeverity = receiver: lib.elem journaldSeverityParser (receiver.operators or [ ]);
# Whether a container collector's settings carry the self-scrape of
# ../collector-self-scrape.nix: the telemetry endpoint on loopback at `port`,
# a job scraping exactly that address, and a metrics pipeline that reads the
# job and leaves through an exporter the settings define. `attrs` are the
# resource attributes the pipeline stamps.
selfScrapes =
s: port: attrs:
let
job = lib.findFirst (j: j.job_name == "collector") null (
s.receivers."prometheus/self".config.scrape_configs or [ ]
);
pipeline = s.service.pipelines."metrics/self" or null;
reader = lib.head (s.service.telemetry.metrics.readers or [ { } ]);
stamped = lib.mapAttrsToList (key: value: {
inherit key value;
action = "upsert";
}) attrs;
in
job != null
&& job.static_configs == [ { targets = [ "127.0.0.1:${toString port}" ]; } ]
&&
(reader.pull.exporter.prometheus or null) == {
host = "127.0.0.1";
inherit port;
}
&& pipeline != null
&& pipeline.receivers == [ "prometheus/self" ]
&& (s.processors."resource/self".attributes or null) == stamped
&& pipeline.exporters != [ ]
&& lib.all (e: s.exporters ? ${e}) pipeline.exporters;
# The enables that switch owns. The hive tier's collector is not among them: it
# follows `deploy.hive-controller.enable`, and a services host without a hive
# runs none.
@ -283,6 +314,7 @@ in
inherit agentHarness;
inherit journaldSeverityParser;
inherit carriesJournaldSeverity;
inherit selfScrapes;
inherit swarmServiceEnables;
inherit runGroup;
inherit forceServiceConfigs;