# 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}";
  };
}