Prometheus 3.8.0 introduces a relabeling visualizer in its web UI to help users understand and debug target relabeling rules. This feature is particularly useful because relabeling can be complex, requiring precise matches with labels from the service discovery mechanism. A mistake at any point can lead to incorrect labeling or even dropping a target entirely. The visualizer is accessible via the "Service discovery" page on any Prometheus server. By clicking the new "show relabeling" button next to a discovered target, users can see the initial labels and follow how each relabeling rule is applied sequentially. The tool highlights changes—additions, deletions, and modifications—in color, making it clear how labels evolve through each rule. It also indicates whether the target is kept or dropped after applying all rules, presenting the final output labels if the target remains. This functionality allows users to troubleshoot more effectively by providing a clear, step-by-step view of relabeling processes. By following the diagram from top to bottom, users can pinpoint where labels change unexpectedly or identify misconfigurations. This enhancement aims to streamline the debugging process, making it easier to maintain correct target configurations in Prometheus.