The external export is a setting of the swarm collector, so it moves to
services.hyperhive.deploy.swarm-otel.upstream. Renamed:
- otel.endpoint -> upstream.endpoint
- otel.protocol -> upstream.protocol
- otel.headersCredential -> upstream.headersCredential
- otel.collector.upstreamHeaderName -> upstream.headerName
The unreleased otel.upstreamSignals is declared as upstream.signals.
Hosts keep working through the rename warnings. Eval test covers the old
paths reaching the new options. Docs and stale comments point at the
new paths.