template: bcache_cache_errors
      on: disk.bcache_cache_read_races
  lookup: sum -1m unaligned absolute
   units: errors
   every: 1m
    warn: $this > 0
   delay: up 2m down 1h multiplier 1.5 max 2h
    info: the number of times the data was being read from the cache, the bucket was reused and invalidated, during the last 10 mins (when this occurs the data is reread from the backing device)
      to: sysadmin

template: bcache_cache_dirty
      on: disk.bcache_cache_alloc
    calc: $dirty + $metadata + $undefined
   units: %
   every: 1m
    warn: $this > ( ($status >= $WARNING ) ? ( 70 ) : ( 90 ) )
    crit: $this > ( ($status == $CRITICAL) ? ( 90 ) : ( 95 ) )
   delay: up 1m down 1h multiplier 1.5 max 2h
    info: the percentage of cache space used for dirty and metadata (this usually means your SSD cache is too small)
      to: sysadmin