$ attack-timer.pl 'auth: pam_unix(dovecot:auth): authentication failure; logname=' /var/log/auth.log

  45.125.65.159: min:  2100, max:  3367, avg:  2175, hits:    82
   141.98.10.70: min:  2098, max:  3291, avg:  2193, hits:    82
  141.98.10.217: min:  2074, max:  4173, avg:  2196, hits:    82
   45.125.66.24: min:  2162, max:  3417, avg:  2229, hits:    81
   141.98.11.17: min:  2111, max:  3336, avg:  2206, hits:    81
   141.98.11.19: min:  2121, max:  3438, avg:  2237, hits:    80
   141.98.11.14: min:  2072, max:  3359, avg:  2355, hits:    76
  185.36.81.192: min:  2957, max:  3647, avg:  3117, hits:    63
  141.98.10.203: min:  2008, max:  8276, avg:  2279, hits:    59
   141.98.10.82: min:  1897, max:  7819, avg:  2158, hits:    57
   141.98.10.24: min:  2083, max:  3441, avg:  2186, hits:    49

Summary: min:  1897, max:  8276, avg:  2303, hits:   791