[workers-observability] Add changelog entry for CPU time and Wall tim…

…e in Workers Observability offerings

src/content/changelog/workers/2025-04-09-workers-timing.mdx

@@ -0,0 +1,21 @@
+---
+title: CPU time and Wall time now published for Workers Invocations
+description: Workers Observability tooling now shows CPU time and Wall time for a Workers Invocation.
+products:
+  - workers
+date: 2025-04-09T00:00:00Z
+---
+
+You can now observe and investigate the CPU time and Wall time for every Workers Invocations.
+
+- For [Workers Logs](/workers/observability/logs/workers-logs), CPU time and Wall time are surfaced in the [Invocation Log](/workers/observability/logs/workers-logs/#invocation-logs)..
+- For [Tail Workers](/workers/observability/logs/tail-workers), CPU time and Wall time are surfaced at the top level of the [Workers Trace Events object](/logs/reference/log-fields/account/workers_trace_events).
+- For [Workers Logpush](/workers/observability/logs/logpush), CPU and Wall time are surfaced at the top level of the [Workers Trace Events object](/logs/reference/log-fields/account/workers_trace_events). All new jobs will have these new fields included by default. Existing jobs need to be updated to include CPU time and Wall time.
+
+You can use a Workers Logs filter to search for logs where Wall time exceeds 100ms.
+
+![Workers Logs Wall Time Filter](src/assets/images/changelog/workers/observability/2025-04-09-wall-time-filter.png)
+
+You can also use the Workers Observability Query Builder to find the median CPU time and median Wall time for all of your Workers.
+
+![Query Builder filter](src/assets/images/changelog/workers/observability/2025-04-09-query-builder.png)