Summary: [ENG-11219](https://linear.app/comm/issue/ENG-11219/issues-with-tunnelbroker-metrics-about-active-connections)

Test Plan:
1. Run Tunnelbroker, check in logs how many connections are opened
2. Delete one token from DDB
3. Check if this is reflected in logs

Reviewers: tomek, bartek

Reviewed By: bartek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D15300