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Add missing `label` key to named Getopts args
If the `label` key is given as a named argument for argument specification, if it turns out to be the first element returned in the argument list subject to hash randomization, then this test for named arguments fails due to the omission of the label from this alternating group in the pattern. When this happens, the code for an unnamed list of items was run instead, leading to a very confusing area happening randomly: 8 parameters were passed to Monitoring::Plugin::Getopt::arg but 2 - 5 were expected at PERL/lib/perl5/Monitoring/Plugin/Getopt.pm line 397. Monitoring::Plugin::Getopt::arg(undef, "label", "HOSTNAME", "required", 1, "help", "Hostname of device to check", "spec", ...) called at PERL/lib/perl5/Monitoring/Plugin.pm line 161 Monitoring::Plugin::add_arg(Monitoring::Plugin=HASH(0x1f90fd8), "label", "HOSTNAME", "required", 1, "help", "Hostname of device to check", "spec", ...) called at libexec/check_example line 144 If you specified all five keys for your argument, then this happens (roughly) one-fifth of the time.
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