Worker insights

[Alex-Tideman]

Description & motivation 💭

New top-level Workers page (/namespaces/{namespace}/workers) with two tabs:

• Instances — A paginated, filterable table of all worker instances showing status, instance key, deployment, build ID, task queue, identity, host name, start time, and SDK version.
• Deployments — Lists worker deployments with version history (moved from its previous location under /deployments to /workers/deployments).

Worker details page (/workers/{workerInstanceKey}) with:

• Status and other details
• Task slot metrics per type (Workflows, Activities, Nexus, Local Activities) with used/available visual meters
• Poller count, mode (e.g. Autoscaling/Manual), and last successful poll time
• Host info. (hostname, process ID, worker grouping, CPU and memory usage with meter bars)
• Workflow cache stats (size, hit rate %)
• Diagnostics (poll success rate)
• Go SDK dependency warning when CPU/memory data is missing

Workers tab on Workflow (/namespaces/{namespace/workflows/{...}/workers) and Standalone Activity (/namespaces/{namespace/activities/{...}/workers) details page:

• shows a workers table filtered by the task queue
• shows a fallback table based on the legacy pollers API when heartbeats aren't enabled

Screenshots (if applicable) 📸

Worker Instances

Table	Query Empty State	SDK Alert	Dynamic Config Alert

Worker Details

Running	No Heartbeat Info.	Go SDK alert

Task Queue Workers

Workflow Workers	Workflow Workers Fallback	SDK Alert

Design Considerations 🎨

Testing 🧪

How was this tested 👻

• Manual testing
• E2E tests added
• Unit tests added

Steps for others to test: 🚶🏽‍♂️🚶🏽‍♀️

Run temporal server from a local build

1. Ensure you have cloned the temporal repo
2. Set WorkerHeartbeatsEnabled
3. Run make bins and make start
4. Running temporal server from a local build does not create the namespace, run temporal operator namespace create --namespace canary
5. Create a search attribute for the canary namespace, run temporal operator search-attribute create --namespace canary --name CustomKeywordField --type Keyword

Run the UI against a local build of temporal server

1. Checkout the workflow-insights branch in the UI repo
2. pnpm dev:local-temporal

Run some sample workflows in the canary-go repo

1. Run make bins and ./temporal-canary start

---

On the

• Workflows details page under the "Workers" tab
• Standalone activity details page under the "Workers" tab
• On the task queue details page

the workers table should

• Revert to a list of pollers (previous UI) if Namespace > capabilities > workerHeartbeats is not enabled
• Show a list of workers (if using an SDK version that supports it) for the task queue
• Show an alert r.e. SDK's if Namespace > capabilities > workerHeartbeats is enabled but no workers are being returned

• On /workers page

  • It should list all instances for a given Namespace
  • Instances should update if the Namespace is changed via the Namespace switcher
  • Filtering should work as expected (is null and is not null should not be listed as possible conditions)
  • It should show an alert r.e. SDK's if Namespace > capabilities > workerHeartbeats is enabled but no workers are being returned
  • It should show an alert r.e. enabling Namespace > capabilities > workerHeartbeats if it is currently disabled
  • /workers/deployments should work as expected

• On the /workers/{workerInstanceKey} page

  • It should list worker and heartbeat info. as expected
  • The "Task Queue" link should go to the /workers page with the TaskQueue filter applied
  • It should 404 if the worker instance doesn't exist

• On the /activities page

  • Verify filtering still works as expected

• On any /worker-deployment pages

  • Verify there is a redirect to /workers/deployments

Checklists

Draft Checklist

Merge Checklist

• Corresponding Cloud PR

Issue(s) closed

DT-3612

Docs

Any docs updates needed?

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Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	Apr 7, 2026 9:34pm

[temporal-cicd]

Warnings

⚠️

📊 Strict Mode: 12 errors in 3 files (3.3% of 366 total) src/lib/utilities/route-for-api.ts (8) L68:48: Element implicitly has an 'any' type because type 'typeof globalThis' has no index signature. L74:50: Element implicitly has an 'any' type because type 'typeof globalThis' has no index signature. L76:4: Type 'string | null' is not assignable to type 'string'. L103:8: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{ namespace: string; workflowId: string; scheduleId: string; queue: string; queryType: string; signalName: string; updateName: string; batchJobId: string; runId: string; activityId: string; endpointId: string; deploymentName: string; version: string; workerInstanceKey: string; }'. L103:38: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Partial'. L105:8: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{ namespace: string; workflowId: string; scheduleId: string; queue: string; queryType: string; signalName: string; updateName: string; batchJobId: string; runId: string; activityId: string; endpointId: string; deploymentName: string; version: string; workerInstanceKey: string; }'. L105:57: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Partial'. L191:16: This overload signature is not compatible with its implementation signature. src/lib/stores/filters.ts (2) L114:2: Argument of type 'StartStopNotifier<EventTypeCategory[] | null>' is not assignable to parameter of type 'StartStopNotifier<EventTypeCategory[] | undefined>'. L130:13: Argument of type 'StartStopNotifier<("Scheduled" | "Unspecified" | "Open" | "New" | "Started" | "Initiated" | "Running" | "Completed" | "Fired" | "Signaled" | "Canceled" | "Failed" | "Terminated" | "TimedOut" | "CancelRequested")[] | null>' is not assignable to parameter of type 'StartStopNotifier<("Scheduled" | "Unspecified" | "Open" | "New" | "Started" | "Initiated" | "Running" | "Completed" | "Fired" | "Signaled" | "Canceled" | "Failed" | "Terminated" | "TimedOut" | "CancelRequested")[] | undefined>'. src/lib/utilities/screaming-enums.ts (2) L92:14: Type 'PendingNexusOperationState.PENDING_NEXUS_OPERATION_STATE_UNSPECIFIED | undefined' is not assignable to type 'PendingNexusOperationState'. L99:14: Type 'CallbackState.CALLBACK_STATE_UNSPECIFIED | undefined' is not assignable to type 'CallbackState'.

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