| the canary notification method is a lack of updates, not a specific update. you update your canary to say that nothing has changed, at a known cadence. if you ever dont make the update, readers know that the canary has expired, and so you have been served a gag order warrant. changing or removing the canary in response to a warrant is illegal. not changing it is legal. for an equivalent cloudwatch setup, its checking the flag for "alarm when there's no points" |
I suspect they didn't go for this route as it is too slow.