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This commit does two related things: * We make the poll interval a random time between 0.5 and 1.5 times the configured interval. * We introduce the BALENA_SUPERVISOR_INSTANT_UPDATE_TRIGGER configuration variable, that defaults to true. If this variable is set to false, then calls to /v1/update are ignored, and on startup the supervisor waits for a poll interval before getting the target state. This will help especially on cases where there's a large number of devices on a single network. By disabling instant updates and setting a large poll interval, we can now achieve a sitation where not all devices apply an update at the same time, which can help avoid overwhelming the network. Change-type: minor Signed-off-by: Pablo Carranza Velez <pablo@balena.io>