The host-side collector is the only path telemetry leaves a hive, so
HYPERHIVE_OTEL_HEADERS_CREDENTIAL is never emitted and everything
downstream of it is unreachable. What made it worth removing rather than
leaving inert is what it looked like to a reader: a complete,
well-commented mechanism for writing the hive's upstream credential into
a file the agent can read, described in the present tense. Anyone auditing
"can an agent obtain the OTEL token?" had to reconstruct the whole env-var
chain to find out the answer is no.
Gone: the per-agent `hyperhive.otel.headersCredential` option, the
`hive-otel-header` oneshot that merged OTEL_EXPORTER_OTLP_HEADERS into the
agent's own settings.json, and meta.rs's field, env read and render.
⚠️ Scoped by NAMESPACE, not by name. `hyperhive.otel.headersCredential`
(per-agent) and `services.hyperhive.otel.headersCredential` (host) are
different options sharing a leaf name — the host one is read by
`stats/otel_metrics.rs` for c0re's own container-resource exporter and
stays. Sweeping the string would have taken out working code.
The comment above `otelSettingsEnv` now states the property rather than
the absence: there is no auth header and no mechanism to add one, because
an agent exports to the hive's own collector and nothing an agent can read
is a secret to the swarm. The old behaviour is named in the past tense so
it reads as removed rather than overlooked.
meta.rs's assertions that pinned the injection are deleted rather than
adjusted; the surrounding test keeps covering extraResourceAttributes and
the endpoint/protocol injection, which are live.
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