[workers-observability] Add changelog entry for revamped workers metrics

src/content/changelogs-next/2025-01-31-workers-metrics-revamp.mdx

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+---
+title: Revamped Workers Metrics 
+description: Monitor your Worker's performance with a default set of automatically enabled metrics.
+products:
+  - workers
+date: 2025-01-31T12:00:00Z
+---
+
+The new [Workers Metrics dashboard](https://dash.cloudflare.com/?to=/:account/workers/services/view/:worker/production/metrics/) makes it easier to compare metrics across Worker versions, understand the current state of a [gradual deployment](/workers/configuration/versions-and-deployments/gradual-deployments/), and review key Workers metrics in a single view, including:
+
+* Total Invocations
+* Subrequests from a Worker
+* Errors, grouped by Version and Invocation Status
+* Execution-related latency, including CPU time and Wall time for the invocation
+* Request duration, highlighting the benefits of [Smart Placement](/workers/configuration/smart-placement/)
+
+The Workers Metrics dashboard has been enabled for all customers. Learn more about [metrics](/workers/observability/metrics-and-analytics).