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Kubernetes Scheduling: Observing Silent Failures

· 10 min read
Irfan Shah
Founder & CTO at base14

A Pending Pod means Kubernetes accepts your workload but can't run it. Classic culprits are: insufficient capacity, overly restrictive placement constraints, unbound PVCs, autoscaler ceilings, or namespace quota exhaustion. Most teams discover this during an incident. You don't have to. Wire up the OTel Collector's k8s_cluster, kubeletstats, and k8sobjects receivers, alert on FailedScheduling events and Pending pod duration, and you'll catch scheduling failures before your users do. This post covers the five root causes, a kubectl debugging workflow, and a complete OTel instrumentation setup with collector config, deployment topology, and alert conditions.