Add CHANGELOG.md entry

Signed-off-by: Dimitar Dimitrov <dimitar.dimitrov@grafana.com>

CHANGELOG.md

@@ -13,6 +13,7 @@
   * Query blocking can no longer be circumvented with an equivalent query in a different format; see [Configure queries to block](https://grafana.com/docs/mimir/latest/configure/configure-blocked-queries/)
 * [CHANGE] Query-frontend: stop using `-validation.create-grace-period` to clamp how far into the future a query can span.
 * [CHANGE] Clamp [`GOMAXPROCS`](https://pkg.go.dev/runtime#GOMAXPROCS) to [`runtime.NumCPU`](https://pkg.go.dev/runtime#NumCPU). #8201
+* [CHANGE] Anonymous usage statistics tracking: add CPU usage percentage tracking.
 * [CHANGE] Added new metric `cortex_compactor_disk_out_of_space_errors_total` which counts how many times a compaction failed due to the compactor being out of disk. #8237
 * [FEATURE] Continuous-test: now runable as a module with `mimir -target=continuous-test`. #7747
 * [FEATURE] Store-gateway: Allow specific tenants to be enabled or disabled via `-store-gateway.enabled-tenants` or `-store-gateway.disabled-tenants` CLI flags or their corresponding YAML settings. #7653