Plugins should provide a version via -V or --version parameter which is bumped on releases. This allows to identify problems with too old or new versions on the community support channels.

Example in Python taken from check_tinkerforge:

import argparse
import signal
import sys

__version__ = '0.9.1'

if __name__ == '__main__':
    parser = argparse.ArgumentParser()

    parser.add_argument('-V', '--version', action='version', version='%(prog)s v' + sys.modules[__name__].__version__)