Prometheus Interview Questions — All Categories
17 questions tagged with Prometheus as a technology, across every category it appears in
How would you distinguish a genuine memory leak from a legitimately growing in-memory cache, using only Kubernetes-level metrics?
AdvancedKubernetesPrometheus8 min
How would you set up alerting to catch a CrashLoopBackOff-class issue before it reaches production traffic, rather than discovering it via a user-facing outage?
IntermediateKubernetesPrometheus7 min
How would you build automated alerting specifically for the df/du divergence pattern, rather than relying on someone noticing it during an incident?
IntermediateLinuxPrometheus6 min
How does multi-window burn-rate alerting actually work mathematically — what does "burn rate" mean precisely?
AdvancedSREPrometheus8 min
Your on-call team is getting paged 40+ times a week and starting to ignore alerts. How would you redesign the alerting strategy to fix that without missing real incidents?
AdvancedPrometheusMonitoring10 min
A team added a 'user_id' label to a metric to debug a specific customer's issue, and now your Prometheus instance is running out of memory and queries are timing out. What happened?
AdvancedPrometheus8 min
You need to track request latency percentiles across your fleet. When would you use a Prometheus Histogram versus a Summary metric type, and why can't you just average a Summary's percentiles across instances?
AdvancedPrometheus7 min
A dashboard using rate() on a counter metric shows a value that doesn't match what you'd expect from doing the math manually. What's actually going on, and when should you use rate() versus increase()?
IntermediatePrometheus6 min
Your Prometheus storage costs are growing unsustainably from keeping raw-resolution metrics for a year. How would you design a retention and downsampling strategy to control costs?
AdvancedPrometheus7 min
A team has started ignoring alerts because most of them turn out to be noise — how do you diagnose and fix alert fatigue systematically?
AdvancedPrometheus8 min
How would you choose the right SLIs for a new service, rather than defaulting to generic latency and error rate for everything?
AdvancedPrometheus7 min
During an incident spanning multiple services, how would you quickly correlate metrics across them to find where the problem actually originates?
AdvancedPrometheusGrafana8 min
A service's dashboard has 40 panels, and during a real incident nobody can find the signal that actually explains what's wrong. How would you redesign it?
IntermediatePrometheusGrafana6 min
A team wants to log every value they'd normally track as a metric, reasoning logs give more detail. What breaks when metrics and logs' roles get confused?
IntermediatePrometheus6 min
A Prometheus instance's memory usage keeps growing and query performance is degrading — how do you diagnose a cardinality explosion?
AdvancedPrometheus8 min
What's the difference between the RED and USE monitoring methodologies, and which resources should each actually be applied to?
IntermediatePrometheus6 min
What's the difference between synthetic monitoring and real user monitoring, and why would you need both rather than just one?
IntermediatePrometheus6 min