hs: Add DoS defense counter to DoS heartbeat message
Now that legacy/trac#15516 (moved) is merged, we'll soon enable those defenses and it would be nice to have the counter of how many introduction were rejected due to DoS defenses.
Now that legacy/trac#15516 (moved) is merged, we'll soon enable those defenses and it would be nice to have the counter of how many introduction were rejected due to DoS defenses.