A deploy went out and your error rate climbed right after. Before you start bisecting commits, you ask Noz what changed between the window before the release and the window after.
Prerequisites
- A SigNoz Cloud account with Noz available.
- Services sending traces and logs to SigNoz.
Step 1: Ask what changed
Open Noz from the top-right header and describe what you saw:
Errors on the checkout service jumped after the 2pm deploy. What changed?
Noz compares checkout's error rate and latency for the windows before and after 2pm and reports what moved: which operations started failing, whether latency shifted, and how the post-deploy window differs from the baseline. Follow up to cut the pre-existing noise:
Show me only the errors that appeared after the deploy and weren't there before.
Step 2: Confirm the cause
Pull a failing trace from after the deploy and show me where it breaks.
Noz pulls a representative post-deploy trace, points to the span that fails or slows down, and offers Suggested Actions to keep going (for example, opening the related logs or the dependency the span calls).
Tips
- Anchor on the deploy time. Naming the release window lets Noz compare before and after instead of summarizing the whole window.
- Verify before you roll back. Treat the proposed cause as a hypothesis until a real failing trace confirms it.
Under the Hood
To answer, Noz works through several agentic steps, visible under Worked through N steps:
| Step | What It Did |
|---|---|
| Ran builder query | Compared checkout's error rate for the windows before and after the deploy |
| Searched traces / logs | Pulled the error signatures and failing traces from the post-deploy window |
| Ran builder query | Checked whether latency or a downstream dependency also shifted |
| Reasoned | Isolated what appeared after the release and ranked the likely cause |
Next Steps
- Find Where Latency Is Going with Noz - When the regression is latency, not errors.
- Post Deployment Monitoring - Compare metrics before and after a deploy from your coding agent.
If you need help with the steps in this topic, please reach out to us on SigNoz Community Slack.
If you are a SigNoz Cloud user, please use in product chat support located at the bottom right corner of your SigNoz instance or contact us at cloud-support@signoz.io.
