How to Safely Transition from Single-Tenant to Multi-Tenant in Loki without Impacting Existing Services?

[soonyubi]

We are operating a service where we use Grafana, Loki, and OpenTelemetry to collect and visualize logs. In our current production environment, we are using single-tenant mode with auth_enabled: false.

Now, we are planning to switch to multi-tenant mode by enabling auth_enabled: true. However, we are concerned about potential issues that may arise from this change.

For example, when switching to multi-tenancy, will existing data still be accessible in Grafana, or will we need to update all data sources with the appropriate header values (like X-Scope-OrgID)?

What are the best practices to safely transition from single-tenant to multi-tenant mode in Loki, ensuring that our monitoring services remain unaffected during the deployment process?

We would greatly appreciate any advice or recommendations based on similar experiences.