message: CHANGELOG: mention `chain_height` metric deprecation
diff: @@ -15,11 +15,12 @@ All notable changes to this project will be documented in this file. The format
  ### Added
  * Add `net-info` command to diagnostics port to gain insights into the nodes network connectivity state.
  -* Add metrics `deploy_buffer_total_deploys`, `deploy_buffer_held_deploys`, `deploy_buffer_dead_deploys` to report status of the node deploy buffer, `block_accumulator_block_acceptors`, `block_accumulator_known_child_blocks` to track status of the block accumulator component, `{forward|historical}_block_sync_duration_seconds` histogram metric to track the progress of block synchronization, `lowest_available_block_height` to report the lowest height that has been synchronized continuously from the tip, `sync_leap_duration_seconds`, `sync_leap_fetched_from_peer_total`, `sync_leap_rejected_by_peer_total`, `sync_leap_cant_fetch_total` to track progress of the sync leaper component.
  +* Add metrics `deploy_buffer_total_deploys`, `deploy_buffer_held_deploys`, `deploy_buffer_dead_deploys` to report status of the node deploy buffer, `block_accumulator_block_acceptors`, `block_accumulator_known_child_blocks` to track status of the block accumulator component, `{forward|historical}_block_sync_duration_seconds` histogram metric to track the progress of block synchronization, `lowest_available_block_height` and `highest_available_block_height` to report the highest and lowest height of the blocks that were synchronized and available on the node, `sync_leap_duration_seconds`, `sync_leap_fetched_from_peer_total`, `sync_leap_rejected_by_peer_total`, `sync_leap_cant_fetch_total` to track progress of the sync leaper component.
  ### Changed
  * Log messages for blocked nodes have been unified and reasons for blocking peers are better tracked.
  +* `chain_height` metric is now deprecated and will be removed in the future. Please use `highest_available_block_height` instead.
  ## [Unreleased]
  