The different PHP versions have support timelines defined by PHP. Please refer to Supported PHP versions at php.net to see which versions are currently supported by PHP and when each version is planned for end of support.
Deprecated versions don't receive updates or security patches, so running them in production should be avoided.
Dynatrace is committed to supporting each PHP version for at least as long as the vendor supports it (in most cases, support extends for at least six months beyond this point).
CLI monitoring is turned off by default, because, during a short-lived CLI execution, injection overhead may make up a large percentage of the whole runtime. You should refrain from using CLI monitoring when threading and forking is used for the monitored application, as these features aren't supported.
At this point, there is no differentiation between CGI and Fast-CGI; these are reported as a single type: CGI.