What command is used to set a custom StatsD ingestion port in Dynatrace OneAgent?

The command that appropriately sets a custom StatsD ingestion port in Dynatrace OneAgent is to use the --set-extensions-statsd-port parameter. This command specifically indicates that you want to configure a custom port for StatsD metrics ingestion, which is crucial for tailoring the monitoring setup according to specific application requirements. Additionally, the --restart-service flag ensures that the changes take effect immediately by restarting the OneAgent service.

Using this command effectively enables Dynatrace users to specify which port the StatsD metrics will use to communicate with the OneAgent, thereby allowing for more control over how metrics are collected and reported. This is particularly useful in environments where multiple services might be running, and you need to differentiate the traffic or avoid port collisions with other services.

The other commands listed do not facilitate setting the StatsD ingestion port. One command retrieves the current StatsD port setting rather than changing it, while the remaining two commands relate to host tagging and do not have any relevance to configuring StatsD ingestion. Therefore, the emphasis on modifying the StatsD ingestion port specifically points to the utility of the chosen command as the correct answer.