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swarm-otel: ship the whole host journal, drop user sessions after it

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The swarm collector's journald receiver read only the units listed in
`services.hyperhive.swarm.otel.journaldUnits`. A unit nobody listed
never reached the store, and a misspelt entry shipped nothing without
an error. The list existed to keep an operator's desktop session out of
a store every swarm operator can read, but the receiver can only match
positively, so the only way to express "not user sessions" was to name
every service instead.

The receiver now reads the whole host journal, and a new
`filter/exclude-user-sessions` processor in the `logs/<swarm>` pipeline
drops records whose `_SYSTEMD_SLICE` is `user-<uid>.slice` (session
scopes and `user@<uid>.service`). The per-hive `logs/<hive>` pipelines
carry agent-container journals only and get no filter.

`journaldUnits` is removed with `mkRemovedOptionModule`, together with
its non-empty assertion and the entry each host module added. The four
module-eval membership checks go with it, replaced by one structural
case in swarm-otel-core.

Closes #3646
This commit is contained in:
atlas 2026-09-30 22:51:52 +02:00 • committed by mara
commit 6b1e825c0a
25 changed files with 72 additions and 324 deletions
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10
nix/agent-modules/otel.nix
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@ -259,12 +259,10 @@ in
# forwards nothing.
directory = "/var/log/journal";
storage = "file_storage";
# No `units` allowlist, unlike the swarm tier's receiver. That
# one needs one because the host's journal also holds an
# operator's own session; a container's journal is the harness
# and what the harness spawns, so there is no foreign traffic to
# filter out and an allowlist would only be a list to forget to
# update.
# No `units` allowlist, and no user-session filter like the swarm
# tier's: a container's journal is the harness and what the
# harness spawns, so there is no foreign traffic to filter out and
# an allowlist would only be a list to forget to update.
# journald's PRIORITY carries the level every line already has;
# without this the record reaches VictoriaLogs with