Workflows/activities to post event notifications that could be listened to

We would like to listen to Temporal workflow/activity lifecycle events (e.g. WorkflowExecutionStarted, ActivityTaskStarted, ActivityTaskCompleted), apply some filtering and transformation and then persist the events to our own database. Business users could query this database directly instead of querying Temporal and transforming/aggregating information at the runtime.

An additional requirement would be ability to distinguish workflow / activity replay / retry events from "first execution" events.

It would be nice if it were possible to attach some kind of listener to a workflow / an activity at the worker level.

We've considered workflow/activity inbound/outbound call interceptors, however, they only seem to fire on a subset of events (start/finish). Additionally, workflow interceptors do not distinguish first start and replay events.

We would be interested in having the functionality available in Java SDK.

Related discussions in the support forum:

• https://community.temporal.io/t/how-to-watch-all-workflows-events-inside-a-namespace/4658
• https://community.temporal.io/t/way-to-listen-on-workflow-lifecycle-events/5887
• https://community.temporal.io/t/consume-temporal-io-events/1630
• https://community.temporal.io/t/can-i-attach-a-listener-to-workflow-execution/4275

Start by reviewing the Java SDK's workflow and activity inbound/outbound interceptor behavior and the linked support-forum discussions. Done would require a defined worker-level listener capability that exposes the requested lifecycle events, supports filtering and transformation, and distinguishes replay or retry events from first execution.