Module mutable_metadata 

Runtime metadata that the host tracer may update after startup.

runtime_id and process_tags are the two tracer metadata values that may change while exporters and workers are already running. They live in a single MutableMetadata struct shared through an ArcSwap; every component holds a MutableMetadataHandle and reads the values through it at use time, so an update by the host SDK propagates to all components.

Protocol

• Writers (the host SDK via FFI, or the library itself) call MutableMetadataHandle::set_runtime_id / MutableMetadataHandle::set_process_tags / MutableMetadataHandle::update to modify the current snapshot.
• Readers call MutableMetadataHandle::load at the point of use, which returns a lock-free snapshot. The snapshot is consistent for a single read only; values are not consistent across multiple load() calls.

Structs

MutableMetadata

The tracer metadata values that may be updated after startup.

MutableMetadataHandle

A shared handle to a MutableMetadata.