#1455 Add liftbridge monitoring to selfmon.

Merged Andrey Vertiprahov requested to merge patch-avs-selfmon-lb into master

Add liftbridge monitoring to selfmon. Metrics:

  • stream_high_watermark - current HighWatermark on liftbridge stream
  • stream_newest_offset - current NewestOffset Liftbridge stream
  • stream_cursor_offset - current offset cursor for service
Edited by Andrey Vertiprahov

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