[metrics-bugs] [Tor Bug Tracker & Wiki] Batch modify: #21366, #21637, #16553

[Tor Bug Tracker & Wiki]

Batch modification to #21366, #21637, #16553 by iwakeh:
milestone to Onionoo-1.7.0

Comment:
Adding the next milestone as these tickets are close to completion.

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Tickets URL: <https://trac.torproject.org/projects/tor/query?id=21366%2C21637%2C16553>
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