While investigating #11812 I noticed that keeping the workspace tab open in the Web UI will cause the workspace in question to have its deadline bumped.

I reproduced this on dev.coder.com main on 2024-02-23T20:42:47.007070788Z (would have been around commit 13359aa) -- after keeping my workspace on but inactive for several minutes, and then opening the tab in the web UI, I observed the deadline was bumped.

I also noticed the following log entry around the same time:

Relevant portion as regards autostop is:

          "connection_count": 6,
          "connections_by_proto": {
            "TSMP": 2,
            "TCP": 4
          },

One possible theory is that the agent is picking up the TSMP connection from coderd as activity. Another possible theory is that the recently added "open ports" dialog which opens a connection to the agent is being picked up as activity.