Your Prettiest Dashboard Is Lying to You (And Grafana Will Never Tell You)
Pull up a chair, grab a cup of chai, and let’s talk about the prettiest graph on your big screen. It might be completely empty. Somewhere right inside your team’s Grafana setup, there is a panel that has not drawn a single real data point for six months. No bright red banners. No screaming error messages. Nothing. The graph line is dead flat, the legend at the bottom is blank, and whenever a…
Imagine your team's dashboard is showcasing a graph that appears empty, yet on closer inspection it's still showing no data points for months. This could be due to a panel in Grafana that hasn't drawn any real data in six months. The graph line is flat, the legend is blank, and even during critical incidents, the dashboard looks calm, leading everyone to believe everything is fine.
However, the reality is far from it. The query used by Grafana simply doesn't exist anymore. This could happen if a developer renamed a metric, a background fetch routine changed, or an old recording rule was deleted. Grafana, however, never alerts you to this situation. It simply renders the panel as a peaceful flatline, even if the underlying query returns an empty vector.
This issue is not limited to a single case but can occur due to various reasons such as metric renames, dropped scrapes, or deleted recording rules. These situations can silently affect your dashboards and go unnoticed for a long time. To prevent such scenarios, a manual audit should be conducted to identify dead weight and a gate should be added to the CI pipeline to prevent the deployment of broken dashboards.
Moreover, with Kubernetes v1.37, the default histograms have been switched on, which could result in Prometheus dropping classic histogram time series, causing histogram_quantile panels to go dark overnight. Therefore, it's essential to perform a pre-flight check to ensure the integrity of your dashboards at all times.
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