def _log_deprecation(self, deprecation_key):
        """
        Logs a deprecation notice at most once per AgentCheck instance, for the pre-defined `deprecation_key`
        """
        if not self._deprecations[deprecation_key][0]:
            self.log.warning(self._deprecations[deprecation_key][1])
            self._deprecations[deprecation_key][0] = True
Logs a deprecation notice at most once per AgentCheck instance, for the pre-defined `deprecation_key`