message: Add new stream metrics to the manual
diff: @@ -516,6 +516,26 @@ caf.mailbox-size
  - **Type**: ``int_gauge``
  - **Label dimensions**: name.
  +caf.stream.processed-elements
  + - Counts the total number of processed stream elements from upstream.
  + - **Type**: ``int_counter``
  + - **Label dimensions**: name, type.
  +
  +caf.stream.input-buffer-size
  + - Tracks how many stream elements from upstream are currently buffered.
  + - **Type**: ``int_gauge``
  + - **Label dimensions**: name, type.
  +
  +caf.stream.pushed-elements
  + - Counts the total number of elements that have been pushed downstream.
  + - **Type**: ``int_counter``
  + - **Label dimensions**: name, type.
  +
  +caf.stream.output-buffer-size
  + - Tracks how many stream elements are currently waiting in the output buffer.
  + - **Type**: ``int_gauge``
  + - **Label dimensions**: name, type.
  +
  Exporting Metrics to Prometheus
  -------------------------------
  