The volume report shows you a summary and detailed breakdown of your incoming customer support requests. It gives you an idea of how "busy" things are in the world of support.
The response time report tells how fast your team is getting back to customers. It's a metric on quality of support and the reports show you when you're doing well and when there are deficiencies in speed.
The first response resolve rate tells you how successful your team is at resolving issues in just one reply rather than multiple replies. It's also a quality metric.
The average thread size is a report that looks like how many messages are within a specific thread. This tells you if a conversation between a customer and an agent is droning on and on. This is usually an indication of a problem that's hard to resolve or agents are using sub-quality replies.
Appreciations report gives you a sense of which replies from agents are being liked and appreciated by customers. It's a glimpse into which responses are good and which are not so good.
Response template usage gives you a count of which templates are being used most often. This can be used to give you insights into what problems your customers are having the most with. It can also be used to improve your product or service.
Tags report is also a count metric telling you which tags are being applied to conversations most. If you have a problem in a specific area of your product and are religious about tagging then this report will give you an idea what problems occur the most often.
The outbound report is used to see metrics based on the messages that your team is sending TO customers. It tells you the volume and some of the most recent messages.
The staff summary report is used to see your overall team performance. It includes at-a-glance metrics per customer support agent such as all time responses, responses in that specific time frame, appreciations, and average response times. There are no further drill downs for this report and it's designed to give you an overview.
The individual staff reports are used drill down on more specific metrics on agent performance. Key metrics include things like number of conversations resolved in time frame, messages per day, and even more recent messages sent to customers among many more.