Instead of switching trigger to unknown state if there are no data in period the sum, str, regexp and iregexp functions will return 0.
If an “icmppingsec” item would return a value less than 0.0001 seconds, the value will be set to 0.0001 seconds.
18.3 Miscellaneous improvements
Fixed issues with mysql user parameter configuration script mysql.size parameter. It contained a complex bash expression and was failing if the default shell was not bash (CVE-2016-4338).