Add ability to see recent access to channel

[seanstaley]

It would be really nice to have a way to see the last X number of GETs and POSTs to a given channel for diagnostic reasons.

Say I have a channel where I want to easily find out where data is being posted from, or what servers are actively accessing the channels content.

[Exide]

For now I've created a dashboard that shows basic GET/POST data on a given cluster/channel combo:
https://app.datadoghq.com/dash/757033/channel-activity

[seanstaley]

Awesome. Thanks!

[crozierm]

1. Are there access logs available on a logging server?
2. Tracking reads and writes will probably be a "thing" this year, for security and asset tracking, so we might consider making this use case part of that effort