How to correctly understand the "delivery rate" of message push service

Online User is a value that can be used to measure the number of successful pushes. The combination of "total number of messages delivered/target number" is the real delivery rate, and this ratio has little reference significance. The positive delivery rate is actually a relatively stable value.

Online delivery rate = number of online users successfully received/number of online users offline delivery rate = number of offline messages delivered/number of offline messages delivered.

Only this delivery rate is the real delivery rate. As for some users, although they are target users, it is impossible for the system to send messages to them after they are pushed-offline or the application has been uninstalled. Therefore, it is obviously impossible to explain this part of users when calculating the delivery rate, and the value of this part of users may increase as the time of an application grows longer and longer.

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