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Nine targets across four panels filtered on xrpl_work_item while leaving it out of their sum by() grouping. PromQL keeps only the labels listed in by(), so the label was dropped from the result and the xrpl_ident legend these panels build from it lost that segment. Perf-iac runs stamp xrpl_work_item and give each work item its own set of nodes, so service_instance_id already separates the runs; the visible effect is the legend rather than merged series. Adding the label makes the work item identifiable, which is the comparison these panels exist for. NuDB Read Latency and NuDB Read Found Ratio each divide two aggregations. Both sides get the label so their label sets stay equal and vector matching still works.