[Helm chart] Canary generate dynamic labels

[loganmzz]

Describe the bug

Helm chart is by default deploying Loki Canary which produces test logs for Loki. However, generated logs use following labels:

• detected_level
• service_name
• stream
• pod

However this last one is dynamic, change based on both node & daemonset lifecycle. This is a bad practice as depicted in https://grafana.com/docs/loki/latest/get-started/labels/bp-labels/.

To Reproduce

Steps to reproduce the behavior:

1. Deploy Loki with Helm chart:
   • Repository: https://grafana.github.io/helm-charts
   • Chart: loki
   • Version: 6.29.0

Expected behavior

1. Use canary specific label-set
2. Avoid dynamic labels such as Pod or Node name

Environment:

• Infrastructure: Kubernetes
• Deployment tool: helm

Screenshots, Promtail config, or terminal output

N/A