Live log streaming
The fastest way to see what the Worker is doing is wrangler tail:
wrangler tail superbox-executor --format pretty
Stop streaming with Ctrl+C. Logs are also retained for 24 hours in the Cloudflare dashboard under Workers & Pages > superbox-executor > Logs.
Filtering logs
# Show only errors
wrangler tail superbox-executor --status error
# Filter by IP address
wrangler tail superbox-executor --ip 1.2.3.4
# Compact JSON output (pipe to jq)
wrangler tail superbox-executor --format json | jq .
Workers Analytics dashboard
- Open dash.cloudflare.com
- Navigate to Workers & Pages > superbox-executor
- Open the Metrics tab
Key metrics available:
| Metric | Description |
|---|
| Requests | Total invocations per time period |
| Errors | 4xx/5xx responses |
| CPU time | Aggregate compute time (p50/p99) |
| Duration | Wall-clock time per invocation |
| Subrequests | Outbound fetch calls (e.g. R2 reads) |
Durable Object metrics
Durable Object metrics are under Workers & Pages > superbox-executor > Durable Objects:
| Metric | Description |
|---|
| Active objects | Current live DO instances (sessions) |
| Requests | DO request rate |
| Errors | DO-level errors |
| Storage reads/writes | (Not used - in-memory only) |
R2 request metrics
Under R2 > superbox-mcp-registry > Metrics:
| Metric | Description |
|---|
| Class A operations | PUT, DELETE (writes) |
| Class B operations | GET, LIST (reads) |
| Stored bytes | Total registry size |
Alerting
Configure alerts in Notifications (Cloudflare dashboard > Notifications):
- Worker error rate spike - triggers when error rate exceeds a threshold
- Worker CPU time exceeded - triggers on high compute cost per invocation
For critical alerts, use Cloudflare’s webhook notifications to send to Slack or PagerDuty.
Debugging a failed request
- Get the
cf-ray header from the failed response
- Search for it in
wrangler tail output or the Logs tab in the dashboard
- Identify the error type:
R2Error - R2 bucket access issue (check credentials)DO error - Durable Object exception (check server code)401 - Invalid or missing Firebase JWT504 - Worker CPU time limit exceeded (30 ms burst limit on free tier)