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  1. fetcher helper usage is permanently above 96% and fetcher count is already high (i.e., >50 or 100 or more) and
  2. the service "Check_MK" runs into constant "CRIT with fetcher timeouts   
    1. You can also use this command to narrow down and to find slow running active checks

      Code Block
      lq "GET services\nColumns: execution_time host_name display_name" | awk -F';' '{ printf("%.2f %s %s\n", $1, $2, $3)}' | sort -rn | head

This can have mainly twofold reasons: