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Checkpoints can be skipped when the server is idle. The existing num_timed and num_requested counters in pg_stat_checkpointer track both completed and skipped checkpoints, but there was no way to count only the completed ones. This commit introduces the num_done counter, which tracks only completed checkpoints, making it easier to see how many were actually performed. Bump catalog version. Author: Anton A. Melnikov Reviewed-by: Fujii Masao Discussion: https://postgr.es/m/9ea77f40-818d-4841-9dee-158ac8f6e690@oss.nttdata.com