bug(api): Workers Observability dashboard shows no logs for sonora-api-staging despite verified config

[masch]

Bug Description

Workers Observability on the staging API Worker (sonora-api-staging) is fully configured and verified at the API level, but no logs appear in the Cloudflare dashboard — neither in the persisted Logs tab (Workers Logs / Query Builder, last 30 minutes) nor in Real-time logs — while wrangler tail captures the exact same logs correctly in real time.

The Worker was deployed with wrangler deploy --config wrangler.staging.toml and the deployed settings confirm the configuration is applied.

Steps to Reproduce

1. cd apps/api
2. make api-deploy-staging (or bunx wrangler deploy --config wrangler.staging.toml)
3. Verify deployed settings via API:

   curl -H "Authorization: Bearer $CF_TOKEN" \
     "https://api.cloudflare.com/client/v4/accounts/<ACCOUNT_ID>/workers/scripts/sonora-api-staging/settings"

   → observability.enabled: true, logs.enabled: true, logs.persist: true, logs.invocation_logs: true, traces.enabled: true
4. Make requests to https://sonora-api-staging.sonora-api.workers.dev/health (several, over minutes)
5. In the Cloudflare dashboard: Workers & Pages → sonora-api-staging → Observability → Logs tab (last 30 minutes) and Real-time logs tab
6. Observe: no entries in either tab

Expected Behavior

Workers Logs persisted in the dashboard should appear in the Logs tab within minutes of requests, and Real-time logs should stream live while the session is open — since observability.enabled = true and logs.persist = true are applied on the deployed Worker.

Actual Behavior

• Dashboard Logs tab: empty (no entries in the last 30 minutes, no results from the query builder)
• Dashboard Real-time logs tab: empty
• wrangler tail --config wrangler.staging.toml: works correctly — captures every request/response log in real time (proven with multiple requests)

This is consistent with Cloudflare community report: https://community.cloudflare.com/t/workers-observability-logs-most-logs-not-appearing-in-dashboard-since-march-10/904412 (Workers Observability logs not appearing in dashboard since ~March 10, 2026, while wrangler tail works). Our case differs in one detail: that report shows scattered entries, ours shows zero entries in both tabs.

Relevant Config

apps/api/wrangler.staging.toml (and apps/api/wrangler.toml for production):

[observability]
enabled = true
head_sampling_rate = 1

[observability.logs]
enabled = true
invocation_logs = true

[observability.traces]
enabled = true
head_sampling_rate = 1

Environment

• Account plan: Standard
• Worker: sonora-api-staging (pre-existing Worker, created before the Workers Observability feature rollout)
• Wrangler: 4.106.0
• Runtime: Hono on Cloudflare Workers (Node.js compat)
• Observed: 2026-08-04/05 UTC

Workaround

Use bunx wrangler tail --config wrangler.staging.toml from apps/api for real-time log visibility — this works reliably and captures the same logs the dashboard fails to show.