Unified Observability: Linking Prometheus Metrics to Loki Logs

Act as an Observability Systems Architect. Develop a highly integrated Grafana workflow engineered to seamlessly correlate massive 5xx error spikes in Prometheus directly with the underlying stack traces stored in Grafana Loki. You must define a rigid, uncompromising [LABEL_SELECTOR] taxonomy (e.g., strict matching of `cluster`, `namespace`, `app` tags) to guarantee 1:1 consistent labeling across both the TSDB metrics and the [LOG_FORMAT] (e.g., JSON or Logfmt) text logs. Write an advanced LogQL query that instantly filters millions of log lines based entirely on a shared trace ID inherited from a Prometheus metric anomaly. Describe the exact UI configuration steps to establish 'Derived Fields' and 'Data Links' within Grafana to unlock frictionless, single-click cross-navigation from a metric graph directly into the raw logs.