message: Update changelog - describe `/node/metrics`
diff: @@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
  - Added `get_quotes_for_all_trusted_nodes_v1` API. This returns the ID and quote for all nodes which are currently trusted and participating in the service, for live audit (#2511).
  - Added node start-up check for `cchost` and enclave compatibility, which should both always be from the same release for a single node (#2532).
  - Added a new `/node/version` endpoint to return the CCF version of a node (#2582).
  +- Added a new `/node/metrics` endpoint which includes the count of active and peak concurrent sessions handled by the node (#2596).
  ### Changed
  