The First 10 Minutes of an Outage: An Incident Commander's Checklist

Why the First 10 Minutes Matter

The opening minutes of an incident set the trajectory for everything that follows. Decisions made — or avoided — in this window determine how fast you restore service, how much data you collect for a post-mortem, and whether a small fire becomes a five-alarm crisis.

This checklist is written for whoever is holding the incident commander (IC) role, whether that's a dedicated on-call engineer or a senior dev who just got paged at 2 a.m.

Minute 0–2: Confirm the Incident Is Real

Before you wake anyone up, verify the signal.

• Check your monitoring source. Is the alert from a single probe location or multiple? A single-region alert can indicate a network blip local to that probe. Alerts confirmed from multiple geographically distributed check locations are far more likely to represent a real user-facing outage.
• Hit the service yourself. Open the site or call the API endpoint directly. Does it fail the same way the alert describes?
• Check your status page and recent deploys. Was anything pushed in the last 30 minutes? A failed deployment is the most common cause of a sudden degradation.

If you can't confirm the incident within two minutes, declare it anyway and continue investigating. False positives are cheaper than delayed responses.

Minute 2–5: Declare and Communicate

Once you've confirmed something is wrong, declare the incident formally. This is not bureaucracy — it starts the clock, creates a shared record, and gives your team permission to drop other work.

Steps

1. Open an incident channel. Create a dedicated Slack channel (e.g., #inc-2024-08-12-api-down) or use your incident management tool. Do this before you start debugging.
2. Post an initial summary. One or two sentences: what is broken, what is the user impact, when it started. Don't speculate on cause yet.
3. Assign roles. At minimum: an IC (you), a communications lead if customer-facing, and a scribe to log everything in the channel.
4. Page the right people. Escalate based on the affected system — not based on who you know is awake. Paging the wrong team costs 10–15 minutes you don't have.
5. Update the status page. Even a vague "We are investigating reports of degraded service" is better than silence. Users and customer-facing teams need something.

Minute 5–8: Orient, Don't Diagnose

This is the most common mistake: the IC disappears into a terminal and starts debugging alone. Your job is coordination, not root cause analysis.

Orient the room

• Define the blast radius. What percentage of users or requests are affected? Is it all regions, one data center, one customer tier?
• State what you know and what you don't. "API latency is up 10x. Database looks healthy. We don't yet know if it's the load balancer or the app tier."
• Assign investigation tracks. Send one engineer to check infrastructure metrics, another to review app logs. Parallel investigation beats sequential.
• Set a sync cadence. "I want a 60-second update from each track in three minutes."

Avoid the temptation to form a hypothesis and only look for confirming evidence. Keep tracks independent until data converges.

Minute 8–10: Decide on Immediate Mitigations

By now you should have enough signal to consider fast mitigations — actions that restore service without necessarily fixing the root cause.

• Rollback the last deploy if there's any correlation between the push and the incident start time.
• Shift traffic away from a degraded region or instance if your infrastructure supports it.
• Disable a feature flag if the degradation is isolated to a new feature.
• Increase capacity if the symptom is resource exhaustion and you have headroom to scale.

Mitigations are not fixes. Make this explicit to your team. You're buying time for a proper diagnosis, not closing the incident.

A Note on Monitoring as Your First Signal

The quality of your initial data shapes every decision above. Monitoring that checks from a single location can leave you guessing whether an alert is real. Multi-region checks — where a tool like Pingy confirms a failure from multiple independent vantage points before alerting — reduce the noise and give you geographic context immediately. Knowing that your service is unreachable from both US-East and EU-West is actionable in a way that a single-probe alert is not.

Key Takeaways

• Confirm the incident is real before escalating, but don't let verification delay declaration past two minutes.
• Declare early and formally — it creates the shared context your team needs.
• The IC's job is coordination, not debugging. Assign investigation to others.
• Pursue parallel investigation tracks to avoid tunnel vision.
• Prefer fast mitigations (rollback, traffic shift, flag disable) over waiting for root cause.
• Multi-region monitoring gives you geographic blast radius context from the first alert.