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hive telemetry collector: fetch its OIDC secret from the store under the hive's own leaf

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The hive collector's `oauth2client` secret came from a `clientSecretFile`
defaulting to authelia's own minted file on the IdP's host, with a
`hive-otel-client-secret` oneshot that only waited up to 120s for that
file to exist; any other hive had to copy the file across by hand.

`swarm-bao-hive-otel-oidc` now logs in with the hive's leaf
(`deploy.bao.clientCertFile`), reads `swarm/hives/<hive>/oidc/client`
(written by the publisher, granted by the hive leaf's
`swarm/hives/<hive>/*` read), writes it root 0400 when it differs, and
restarts the collector when the file is newer than its last start.
Retries every 30s for 24h (`lib/store-retry.nix`), like the matrix and
forge fetches. `clientSecretFile` defaults to that file wherever the hive
leaf is set and stays as an override; an overridden file renders no fetch.

otelcol-contrib 0.151.0's oauth2client re-reads `client_secret_file` on
every token fetch, but the path is `LoadCredential`'s start-time copy, so a
changed secret still needs a restart. `lib/refresh-consumer.nix` gains
`refresh_unit` for a host unit; `refresh_consumer` now calls it with
`--machine`.

nats-authelia's "consumer of the host client-secret dir" case pointed at
the collector's old default; it now reads the publisher's path unit.

Refs #5015
This commit is contained in:
atlas 2026-10-10 01:09:20 +02:00
commit 7c50568db1
7 changed files with 282 additions and 114 deletions
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15
docs/scheduler/observability.md
View file

@ -129,11 +129,18 @@ from whichever receiver accepted a sample. A hive therefore can't report
metrics as another hive, and can't relabel its own by editing what it sends —
the label isn't taken from the payload at all.
**On an all-local swarm there is nothing to set.** Each hive already has an
identity, and its collector reads the secret that host's own authelia minted.
**Nothing to set where the hive holds its store identity.** The hive's collector
reads its secret from the swarm's secret store under the hive's own leaf
(`deploy.bao.clientCertFile`): `swarm-bao-hive-otel-oidc.service` fetches
`swarm/hives/<hive>/oidc/client`, which the publisher on authelia's host
writes. It runs at boot and retries every 30s until the store answers; when a
run lands a changed value it restarts the collector. It doesn't run on a timer,
so a secret rotated later arrives the next time the unit runs. On a hive that
runs the store the leaf is already there; elsewhere it's the credential you
place — see [secret placement](../swarm/secrets.md).
**On a hive that doesn't host the swarm's services**, the secret has to arrive
somehow — copy it across and name it:
To deliver the secret some other way, name the file, and the fetch unit isn't
rendered:
```nix
services.hyperhive.otel.clientSecretFile = "/run/secrets/hive-telemetry.secret";