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If we don't have the ICMP hint available, such as on Android, we can use the signal of rx traffic to bias toward a particular endpoint. We don't want to stick to a particular endpoint for a very long time without any signals, so the sticky time is reduced to 1 second, which is large enough to avoid excessive packet reordering in the common case, but should be small enough that either rx provides a strong signal, or we rotate in a user-interactive schedule to another endpoint, improving the feel of failover to other endpoints. Updates #8999 Cherry picked from 1a8b7af39036443cc328513746324715108a1292 Co-authored-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com> Signed-off-by: James Tucker <james@tailscale.com> Signed-off-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com>