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swarm-otel: stamp the swarm on every hive's pipeline

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mara on the tracking issue: "we need the swarm label for upstream otel at
least (the out of swarm one)."

Stamped in the per-hive `resource` processor rather than on a separate
upstream-only pipeline, which would double the pipeline count to withhold one
constant label from the local store. It is redundant there — one metrics store
per swarm, so every series in it already belongs to this swarm — but a constant
label multiplies no series, and it means what leaves and what stays have the
same shape.

Upstream is where it stops being redundant: that is the one hop where several
swarms can land in one store, and samples that cannot name their swarm collide
there exactly as hives collided here before per-hive receivers existed.

`unknown` when unnamed rather than an absent label, copying the agent path so
a query never has to handle both "the label is missing" and "the label says
unknown".
This commit is contained in:
atlas 2026-08-19 15:31:15 +02:00 • committed by mara
commit 7880483b51
1 changed files with 24 additions and 0 deletions
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24
nix/host-modules/swarm-otel.nix
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@ -70,6 +70,12 @@ let
};
caBundle = caTrust.bundlePathFor cfg.machine;
# `unknown` rather than omitting the label, copying `agent-modules/otel.nix`
# deliberately: a producer that cannot name its swarm should say so in the
# same vocabulary as every other producer, so a query never has to handle
# both "the label is absent" and "the label says unknown".
swarmDisplayName = if hyperhiveCfg.swarm.name == null then "unknown" else hyperhiveCfg.swarm.name;
# One list, read by every pipeline: the per-hive pipelines fan out to
# exactly the same destinations as the single pipeline they replace.
# Written once because "which exporters" is a property of this tier, not
@ -489,6 +495,24 @@ in
value = h;
action = "upsert";
}
# Stamped here rather than on a separate upstream-only
# pipeline, which would double the pipeline count to
# withhold one constant label from the local store. It
# is redundant there — one VictoriaMetrics per swarm, so
# every series in it already belongs to this swarm — but
# a constant label multiplies no series, and it means
# what LEAVES and what STAYS have the same shape.
#
# Upstream is where it stops being redundant: that is the
# one hop where several swarms can land in one store, and
# samples that cannot name their swarm collide there
# exactly as hives collided here before per-hive
# receivers existed.
{
key = "swarm";
value = swarmDisplayName;
action = "upsert";
}
];
}
) hivePorts;