:return: Returns tags from config and `JAEGER_TAGS` environment variable
        to use as process-wide tracer tags

def tags(self):
        """
        :return: Returns tags from config and `JAEGER_TAGS` environment variable
        to use as process-wide tracer tags
        """
        tags = self.config.get('tags', {})
        env_tags = os.environ.get('JAEGER_TAGS', '')
        if env_tags:
            for kv in env_tags.split(','):
                key, value = kv.split('=')
                tags[key.strip()] = value.strip()
        return tags