A CronJob exits 0, Pushgateway shows a heartbeat metric that hasn't updated in days, and Prometheus fires nothing. Every dashboard is green while the one thing the heartbeat was supposed to guarantee (that you'd know when the job stops working) has quietly stopped being true. This is a gotcha a...
Source: [Dev.to](https://dev.to/futhgar/pushgateway-heartbeat-gotcha-when-ndots-and-networkpolicy-silently-eat-your-alerts-3908)