bun: Channel injection is unavailable under bun run, and only a debug log says so #23882

registerDiagnosticsChannelInjection takes its fallback branch on Bun. Module.registerHooks is undefined in bun 1.3.14, and the Module.register branch is explicitly gated on !globalAny.Bun (packages/server-utils/src/orchestrion/runtime/register.ts:126).

$ bun run init-probe.mjs
ORCHESTRION MARKER: {"runtimeUnavailable":true}
INTEGRATIONS: 42 ... Graphql,Mongo,Mongoose,Mysql,Mysql2,Redis,Postgres,
Prisma,Tedious,GenericPool,Kafka,Amqplib,LruMemoizer,Aws,LangChain,LangGraph,
VercelAI,OpenAI,Anthropic_AI,Google_GenAI,PostgresJs,Firebase
Sentry Logger [warn]: [Sentry] No diagnostics-channel injection detected...

Twenty-two channel integrations report Integration installed and then never fire. The only signal is debug.warn inside detectOrchestrionSetup, which is off unless the user sets debug: true.

Note that these integrations also handle error capture, not only spans, so a Bun user running bun run loses Express/Fastify/Koa/Hapi error capture too.

Work item. Promote the "no injection detected" message to an always-on consoleSandbox warning on Bun (matching warnRuntimeUnavailable, which already exists for the failure path), and name the fix: build with @sentry/bun/plugin. Keep it debug-only on Node, where the runtime hook normally succeeds.

**Prior art **(tracked). Two open issues describe the symptom without naming the cause: #14202 (open since 2024-11) "Integrations not working for Bun", and #17779 (open). #19696 (closed) "None of the AI auto-instrumentations work with Sentry Bun" is the same report for the AI integrations. The build-time fix shipped in #21410 (merged, the Bun build plugin). There is precedent for the always-on warning proposed here: #22379 (merged) warns when a bundler config externalizes an instrumented module. No issue covers promoting this particular warning.