Not all probes are active at all times. They are all defined in the descriptors that I’m including links for. [1][2]

They all include expiry dates, and probes with perpetual lifetimes require devs to take responsibility for them.

All probes need to go through the data collection process outlined at [3].

[1] https://searchfox.org/mozilla-central/source/toolkit/compone...

[2] https://searchfox.org/mozilla-central/source/toolkit/compone...

[3] https://wiki.mozilla.org/Firefox/Data_Collection