Add KV Store metrics
This adds kv_store_class_a_operations
and kv_store_class_b_operations
. These metrics replace object_store_class_a_operations
and object_store_class_b_operations
. The previously deprecated metrics object_store_read_requests
and object_store_write_requests
have been removed.
Prior change: JavaScript SDK 2.2.0
Following change: JavaScript SDK 2.2.1