Add changelog

Signed-off-by: Kaviraj <[email protected]>

Author: kavirajk

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## master / unreleased
 
+* [CHANGE] Add ability to support strict JSON unmarshal for `pkg/util/validation.Limits` struct. custom `UnmarshalJSON()` will fail if input has unknown struct fields.
 * [CHANGE] Cortex chunks storage has been deprecated and it's now in maintenance mode: all Cortex users are encouraged to migrate to the blocks storage. No new features will be added to the chunks storage. The default Cortex configuration still runs the chunks engine; please check out the [blocks storage doc](https://cortexmetrics.io/docs/blocks-storage/) on how to configure Cortex to run with the blocks storage.  #4268
 * [CHANGE] The example Kubernetes manifests (stored at `k8s/`) have been removed due to a lack of proper support and maintenance. #4268
 * [CHANGE] Querier / ruler: deprecated `-store.query-chunk-limit` CLI flag (and its respective YAML config option `max_chunks_per_query`) in favour of `-querier.max-fetched-chunks-per-query` (and its respective YAML config option `max_fetched_chunks_per_query`). The new limit specifies the maximum number of chunks that can be fetched in a single query from ingesters and long-term storage: the total number of actual fetched chunks could be 2x the limit, being independently applied when querying ingesters and long-term storage. #4125