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zeekay 8e184a0136 feat: one call starts traces, metrics and logs on the ZAP wire 
The three signals already shared everything that matters — the same envelope,
the same port, the same node handshake, the same convention of carrying the
message type in the header flags high byte. What they did not share was a way to
be turned on. Each service dialed three times, configured three exporters and
installed three providers: three chances to get two right and one wrong,
silently, because a provider that was never installed discards every
measurement while the code still reads as instrumented. That failure already
happened twice in this fleet.

Start does all three against one endpoint and returns one Shutdown.

The zero value is a noop. An empty Endpoint installs nothing and dials nothing,
so a service can call Start unconditionally at the top of main and pick up
telemetry when its deployment supplies an endpoint. There is no separate
disabled path to keep working — the branch not taken is the one that rots.

An unreachable collector does NOT fail Start. Exporters connect lazily and
retry; a service that refuses to boot because telemetry is down has made
observation a dependency of serving.

Signals are attempted independently, so a collector rejecting metrics does not
cost the service its traces. Partial telemetry beats none, and the failure is
returned rather than swallowed.

Endpoints are normalized to host:port. They are widely configured as URLs from
the OTLP era, and passing one through dials a host named http — a baffling
failure for a config that looks correct.

No OTLP, no gRPC, no protobuf in the graph.
2026-07-27 12:57:37 -07:00

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