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If labels.pod and labels.namespace are appearing empty in Grafana, it might be due to several reasons related to how metrics are being collected, labeled, and exposed to Grafana, especially in a Kubernetes environment. Here are some potential causes and solutions:

1. Improper Metrics Collection Configuration: Ensure that your metrics collection system (such as Prometheus) is correctly configured to scrape metrics from your Kubernetes cluster. Verify that the scrape configuration includes the Kubernetes pods and namespaces.
2. Lack of Relevant Labels in the Metrics Source: The pods and namespaces labels might not be present in the metrics exported by your applications or the Kubernetes metrics exporters. Check the configuration of your metrics exporters to ensure they include these labels.
3. Relabeling Issues in Prometheus: If you are using Prometheus, relabeling rules might inadvertently remove or alter the labels.pod and labels.namespace labels. Check your Prometheus configuration for any relabel_configs that might affect these labels.
4. Issues with Grafana Query: The query used in Grafana might not correctly reference the labels or might be filtering them out. Review your Grafana panel queries to ensure they correctly include labels.pod and labels.namespace.
5. Grafana Data Source Configuration: Ensure the data source in Grafana is correctly configured to connect to your metrics database (like Prometheus). If the data source is not correctly configured, it might not retrieve all the necessary labels.
6. Kubernetes Metrics API Changes: In some cases, Kubernetes updates or changes in metrics APIs might affect how labels are exposed. Ensure your monitoring tools and agents are up-to-date and compatible with your Kubernetes cluster version.

To troubleshoot, you can:

• Verify Metrics Directly: Query your metrics database (e.g., Prometheus) directly to see if the labels.pod and labels.namespace are present in the data. This can help determine if the issue is with the data source or Grafana's configuration.
• Check the Exporter Configuration: If you are using a specific exporter for Kubernetes metrics (e.g., kube-state-metrics), ensure it is correctly configured and operational.
• Review Grafana and Data Source Logs: Check the logs for any errors or warnings that might indicate why the labels are missing.
• Grafana and Prometheus Documentation: Both Grafana and Prometheus have extensive documentation that can provide guidance on how to correctly configure data sources and queries to include specific labels.

By systematically checking these areas, you can identify why labels.pod and labels.namespace might be missing and apply the necessary fixes to ensure they are correctly displayed in Grafana.