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glue: otel scrape targets for authelia, grafana and nats move out of the services

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Part of #3742.
This commit is contained in:
atlas 2026-10-13 08:33:28 +02:00 • committed by mara
commit c06aa78b63
9 changed files with 68 additions and 64 deletions
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38
nix/host-modules/glue-otel-scrape-targets.nix Normal file
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# Glue: declare the loopback scrape targets of authelia, grafana and nats on the
# swarm's OTEL collector, wherever one of them shares a host with it.
#
# ONE FILE, THREE PAIRINGS — each service ← the collector, with the same shape.
# Deleting this leaves the collector scraping none of them: no error, no
# metrics.
#
# Each target is gated on the service AND the collector being enabled here. The
# loopback address is only honest when both run on this host; a target nobody
# can read asserts a collection that is not happening. Both services default
# from `deploy.allSwarmServices`, but `mkDefault` is an invitation to override,
# so co-location is a property of the auto-deployed topology, not the modules.
#
# ⚠️ Silent when split: separate hosts are separate evaluations with no shared
# context, so a host running a service and no collector declares nothing and
# the collector's host never learns of the service. No error, no warning — a
# healthy exporter and an empty dashboard. Not guardable from here.
#
# ⚠️ `swarm.otel`, not `hyperhive.otel` — two collectors one word apart, and only
# this one reads `scrapeTargets`.
{
lib,
config,
...
}:
let
hyperhiveCfg = config.services.hyperhive;
deployCfg = hyperhiveCfg.deploy;
swarmCfg = hyperhiveCfg.swarm;
withCollector = service: lib.mkIf (deployCfg.${service}.enable && deployCfg.swarm-otel.enable);
in
{
config.services.hyperhive.swarm.otel.scrapeTargets = {
authelia = withCollector "authelia" "127.0.0.1:${toString swarmCfg.authelia.metricsPort}";
grafana = withCollector "grafana" "127.0.0.1:${toString swarmCfg.grafana.metricsPort}";
nats = withCollector "nats" "127.0.0.1:${toString swarmCfg.nats.metricsPort}";
};
}