The Pod Prometheus Never Saw: Kubernetes' Sampling Blind Spot

Source: DZone DevOps

The Fix That Doesn’t Fix It

Reducing your Prometheus scrape interval from 15 seconds to 5 seconds does not fix the sampling blind spot. It merely moves it. Any pod whose entire lifetime falls within one 5‑second scrape gap remains structurally invisible—not because of misconfiguration, not because of missing rules, but because poll‑based collection has an irreducible sampling gap that no interval setting can eliminate.

This article explains exactly why that is, what it costs in production, and what actually fixes it.