On July 31, 2025, Grafana Labs addressed a memory corruption issue in Grafana Cloud Metrics caused by a bug in the Mimir distributor update, which led to a potential data leak involving error messages. The bug, introduced in a recent release candidate, allowed fragments of metrics data from one customer to appear in error messages of another customer, particularly affecting those using the Insights UI. The issue was promptly patched, and erroneous messages were scrubbed from the system by August 3, 2025, with impacted customers notified. Grafana Labs has taken steps to prevent such incidents by improving error handling and security measures, including a review of gRPC buffer pooling and enhancement of static application security testing (SAST) tools. They continue to focus on transparency and security by analyzing any compromised data and reinforcing security protocols. The incident did not affect OpenTelemetry Protocol users, and Grafana Labs has urged users to rotate sensitive information stored in metrics gathering scripts.