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Field Internal name Type Warn Crit Info
Checkpoints issued because of checkpoint_timeout checkpoints_timed derive      
Checkpoint issued by request checkpoints_req derive      
Buffers write when checkpoint occured buffers_checkpoint derive      
Buffers write for cleaning buffers_clean derive      
Times cleaning scan is stopped because exceed bgwriter_lru_maxpages maxwritten_clean derive      
Number of buffers written by backends buffers_backend derive      
Total number of buffers allocated buffers_alloc derive