logging

Shared tracing, sink selection, reload handles and process statistics for MixOS services and the Mix shell. The default build has no Bus or HTTP listener; bus-handlers, prometheus and props are explicit features. Log files use the directory rule in config, including isolated session roots.

Transplant provenance: commit e0297242305f3a3c3de09f1ca01e8faa771768da, MIT OR Apache-2.0. Production callers are Mix and noded.

Property-controlled logging

Enable props to register the <svc>.log singleton against the service's property store. Call logging::props::register(&mut router, &store) to obtain LogNamespace, then await logging::props::attach(&handle, namespace) on the service's Tokio runtime. Registration and read failures return LogError::Props.

Accepted level and filter writes update the live EnvFilter. level=none installs off while preserving the subscriber for later changes. Hooks reject malformed filters, unknown enum variants and deletes. The watcher uses a namespace-private Notify, so it does not compete with the property dispatcher. It lives until the Tokio runtime shuts down.

format remains stored introspection data and does not rebuild sinks. applied_at, applied_by and source remain mutable metadata; the watcher does not write them back. The current log policy grants every reachable peer the namespace's capabilities, including write access that can silence logging. Services needing narrower access must supply their policy. See the contract for the frozen schema.

The source is libs/logging.