'==' can not compare file handles. We can use fileno() function to
compare numerically file numbers. Code without this returns
"connection successful" when it timeouts and $fd is "undefined".

Added option -r <pidfile> for resmon.
If none provided it will run without creating pidfile.
If provided, it will try write it's pid into specified file.
Resmon-systemd.service should have this file as an argument for
resmon as a PIDFile option and in ExecStart option.

resmon systemd service unit

net utilization module

Core module to dump memory usage based on pgrep process name matching

correcting "Can't use an undefined value as an ARRAY reference at /opt/resmon/lib/Core/ChefLastGoodRun.pm line 88." error

s/svcs_path/fmadm_path/ - vestigial docu-pasta?

On some systems, there are lines in /proc/meminfo that don't match the regex.
Currently these cause resmon to throw an error and give a blank metric. This
change skips those metrics rather than throwing an error.

Module for CARP

value to determine whether to use cache_command or run_command.

$commhist{$command}->$now which is distinctly not what it actually is.

report its output.

Module for Membase

Credit: Michal Racek <michal.racek@t-systems.sk>

In Resmon 1, it was possible to add an interval parameter to an individual
check to give it a larger check interval than regular checks (cached results
would be returned in the meantime). This functionality wasn't properly carried
over into resmon 2, and this commit fixes that.

Allow setting an absent => X config param for file checks.  If set will return all the metrics the module normally would, but with their integer values set to whatever you defined for absent.  present will still = 0 and text values will be undef

Occasionally on some systems, the data returned from the shared state file is
bad/blank, despite locking. Ideally we'd find the cause of this and fix it,
but various attempts haven't identified exactly why this happens (including
running fsync after writing and before unlocking). If the data returned is
blank, we should use the latest available data rather than returning blank
data to the user/monitoring system.