Steps to Reproduce

Use android_alarm_manager on android O. I had a repeating inexact alarm every 30 minutes.

Logs

04-18 19:11:30.830 1344 2132 W ActivityManager: Background start not allowed: service Intent { flg=0x4 cmp=com.myapp/io.flutter.plugins.androidalarmmanager.AlarmService (has extras) } to com.myapp/io.flutter.plugins.androidalarmmanager.AlarmService from pid=-1 uid=10235 pkg=com.myapp

Possible Solution

This stackoverflow question suggests that using PendingIntent.getForegroundService instead of PendingIntent.getService for API 26+ in the code here will solve it, but I'm not sure, and I don't know if there are side effects.