Incident Response

Automatic Failover vs Manual Failover: What Is the Difference?

Automatic failover lets a monitoring system detect a primary database failure and promote a replica without any human decision, while manual failover requires…

How to Answer "Tell Me About a Time You Handled a Security or Compliance Issue"

The strongest answer describes a specific security or compliance issue you identified or responded to, the immediate containment steps you took, and how you fo…

How to Answer "Describe a Time You Had to Handle a Crisis Under Public Scrutiny"

The strongest answer uses STAR to show you stabilized the situation first, communicated transparently and on a fixed cadence with the affected audience, and on…

What Are the Principles of Chaos Engineering?

Chaos engineering is the disciplined practice of deliberately injecting failures into a production or production-like system to verify it actually withstands t…

What Causes Database Connection Storms and How Do You Prevent Them?

A database connection storm happens when a large number of application instances or processes simultaneously attempt to open new database connections, typicall…

What is Monitoring vs Observability?

Monitoring is watching a predefined set of metrics and alerts to detect known failure conditions, while observability is the broader capability to ask arbitrar…

How Do You Design Effective Alerting?

Effective alerting fires only on symptoms that indicate real, actionable user-facing impact — not on every internal anomaly — and every alert should be tied to…

What is APM (Application Performance Monitoring)?

APM (Application Performance Monitoring) is the practice of instrumenting an application to capture traces, latency, throughput, and error data for every reque…

What is Structured Logging and Why Does It Matter?

Structured logging means emitting log entries as machine-parseable key-value data, typically JSON, instead of free-form text sentences, so every field like req…

How Does Prometheus Alertmanager Work?

Prometheus Alertmanager is a separate service that receives firing alerts evaluated by Prometheus rule expressions, then handles deduplication, grouping, silen…

What Is Chaos Engineering and Why Do DevOps Teams Use It?

Chaos engineering is the discipline of deliberately injecting controlled failures — killing instances, adding network latency, exhausting resources — into a pr…

What are Feature Toggles (Feature Flags)?

A feature toggle, also called a feature flag, is a runtime conditional that lets a team turn a piece of functionality on or off without deploying new code, dec…

What Rollback Strategies Would You Use in a Deployment Pipeline?

A solid rollback strategy combines fast, automated reversal at the deployment layer — redeploying the previous known-good artifact or flipping a router back to…

What Is a Runbook and Why Does DevOps Rely On Them?

A runbook is a documented, step-by-step procedure for diagnosing or resolving a specific operational scenario — such as a database failover or a spiking error…

How Should an On-Call Rotation Be Designed?

An on-call rotation is a scheduled system where responsibility for responding to production alerts is shared across a team of engineers over fixed time windows…