https://datatracker.ietf.org/doc/html/rfc6762#section-5.2
To
avoid accidental synchronization when, for some reason, multiple
clients begin querying at exactly the same moment (e.g., because of
some common external trigger event), a Multicast DNS querier SHOULD
also delay the first query of the series by a randomly chosen amount
in the range 20-120 ms.
https://datatracker.ietf.org/doc/html/rfc6762#section-5.2
To
avoid accidental synchronization when, for some reason, multiple
clients begin querying at exactly the same moment (e.g., because of
some common external trigger event), a Multicast DNS querier SHOULD
also delay the first query of the series by a randomly chosen amount
in the range 20-120 ms.