👋 Hey team,

Submitting my solution for the Temporal worker connectivity failure detection bounty. This implementation provides a minimal and reproducible test setup, along with a CRE-format rule to detect a worker connection failure when the Temporal server is unreachable.

📋 Details

/claim #39

Reproducible test setup (Maintainers invited): Temporl
Live CRE link: CRE Playground
Log file: worker.log

🎥 Video Demonstration

A complete test demo showing worker failing to connect while server is down and CRE rule triggering:
TemporalWorker.RefusedConnection.mp4

🚨 What This Detects

This rule captures a critical failure mode in self-hosted Temporal environments:

• When a worker starts up but the server is unreachable (crashed, stopped, or not ready), the gRPC connection is refused.
• This results in the worker silently failing to perform workflows, blocking business operations.

🧪 Reproduction Process

Run the following steps to simulate the issue:

# Start Temporal via Docker Compose
docker compose up -d

# Stop the Temporal server
docker compose stop temporal

# Run or restart the worker
go run worker/main.go  # Or your binary

# (Optional) Start the server again after a few seconds
docker compose start temporal

# View the log
cat worker_test.log