Messaging metrics in explore

Currently messaging is lacking a lot of important metrics that were previously available to us before when using chat. This makes it a lot harder to track agent activity. As an example, while multiple agents can answer the same ticket, we can only track it to one person because only assignee is availble as a metric. Trying to use the updates dataset is also not helpfull because it seems the replies from agents are not saved to their names but under the system. We would like to be able to track individual replies by agents as well as things like response times, when the messages were sent and how many per ticket.