* [BUGFIX] API: Fix missing comma during JSON encoding of API results. #14047
## 2.52.0-rc.0 / 2024-04-22
## 2.52.0 / 2024-05-07
* [CHANGE] TSDB: Fix the predicate checking for blocks which are beyond the retention period to include the ones right at the retention boundary. #9633
* [FEATURE] Kubernetes SD: Add a new metric `prometheus_sd_kubernetes_failures_total` to track failed requests to Kubernetes API. #13554