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gateway: send nginx stub_status to VictoriaMetrics, add a gateway dashboard

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The gateway nginx serves stub_status on a loopback server of its own,
127.0.0.1:8085 (services.hyperhive.gateway.statusPort). The hive-tier
collector reads it with the contrib nginx receiver, which the pinned
otelcol-contrib 0.151.0 ships, so no exporter daemon is added. The
receiver dials http:// only (a unix: or http+unix: endpoint fails with
"unsupported protocol scheme"), so the listener is loopback TCP with
allow 127.0.0.1 / deny all rather than a unix socket.

The new gateway dashboard plots nginx.requests, nginx.connections_current
by state, and nginx.connections_accepted against handled, per hive.

Part of #5342.
This commit is contained in:
atlas 2026-10-16 02:40:26 +02:00 • committed by mara
commit f70bbda7d7
8 changed files with 460 additions and 1 deletions
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13
nix/host-modules/otel.nix
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@ -334,6 +334,7 @@ in
hiveName = config.services.hyperhive.hiveName;
listen = "${config.services.hyperhive.network.bridgeIp}:${toString otel.collector.port}";
swarmName = "otlphttp/swarm";
gatewayCfg = config.services.hyperhive.gateway;
authName = "oauth2client/swarm";
# A hive always authenticates to the swarm's collector as itself, so
@ -555,6 +556,15 @@ in
job_name = job;
static_configs = [ { targets = [ target ]; } ];
}) otel.scrapeTargets;
}
# This host's gateway nginx, from the `stub_status` server
# ./hive-gateway/default.nix adds. The receiver dials `http://`
# only, which is why that server is on loopback TCP.
// lib.optionalAttrs gatewayCfg.enable {
nginx = {
endpoint = "http://127.0.0.1:${toString gatewayCfg.statusPort}/stub_status";
collection_interval = "60s";
};
};
# One destination, and it is the swarm's collector. This tier
@ -662,7 +672,8 @@ in
"otlp"
"hostmetrics"
]
++ lib.optional (otel.scrapeTargets != { }) "prometheus";
++ lib.optional (otel.scrapeTargets != { }) "prometheus"
++ lib.optional gatewayCfg.enable "nginx";
# Applies to EVERY receiver above, not just `hostmetrics` — a
# processor sits in the pipeline, not on a receiver. That is
# what we want here: samples an agent pushed over `otlp` and