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Re:Gotify – a self-hosted push-notifications service by benoliver999 on Saturday March 09, 2019 @05:18PM (#19348862)
In my experience it's not bad enough to worry about.

I have:

- Signal - Whatsapp - Etesync - Conversations.im - Syncthing

all whitelisted from battery optimisation, and I've not noticed any huge drain (I expected it to be unusable and have to go back to google play services or micro-g).

Re:Gotify – a self-hosted push-notifications service by jjeaff on Sunday March 10, 2019 @12:05AM (#19350400)
Signal uses gcm to push to the phone thus waking it so it can download any messages. Not sure about the others though.
Re:Gotify – a self-hosted push-notifications service by zuron7 on Sunday March 10, 2019 @12:20AM (#19350458)
If you don't have Google Play Services, it doesn't use GCM.