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o Major features:
- Increate the base amount of time that a canonical connection
(one that we have made to a known OR) is allowed to stay open
from a 3 minutes to 15 minutes. This leaks less information
about when circuits have closed, and avoids unnecessary overhead
from renegotiating connections. Part of a fix for ticket 6799.
- Instead of closing connections at a fixed interval after their
last circuit closed, randomly add up to 50% to each connection's
maximum timout. This makes it harder to tell when the last
circuit closed by looking at when a connection closes. Part of a
fix for ticket 6799.
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