Which configuration line is necessary to enable StatsD monitoring in Apache Airflow?

To enable StatsD monitoring in Apache Airflow, the correct configuration line is "statsd_on = True." This option correctly specifies the key that Airflow recognizes to activate StatsD metrics collection. Once this line is included in the configuration file, Airflow will start sending metrics to a StatsD server, allowing for performance monitoring and observability of your workflows.

In contrast, the other options do not align with the expected configuration keys defined in Airflow's documentation. For instance, "statsd_enabled," "enable_statsd," and "use_statsd_monitor" are not recognized configuration parameters in Airflow for enabling StatsD monitoring, which is why they would not successfully activate the feature. Each of these alternatives lacks the correct naming convention or simply does not exist within the context of Apache Airflow's configuration.