This is a step-by-step guide to enable correlation between metrics and traces, using Prometheus, Grafana, Tempo, OpenTelemetry, and OpenMetrics. — Exemplars are coming! But what are exemplars? A few highlighted values in a time series, with a set of key-value pairs (labels). The main use-case is to include the request’s trace ID in the labels so that we can jump from a metric time series to the interesting traces directly…