When the exporter is fully caught up, the lag reports as 1 instead of 0.
Topic highwaters are the offset where the next message will be written. Since the exporter is subtracting the most recently read message, this will result in a difference of 1.
We don't see this for the normal lag metric because consumer groups commit the offset they should begin reading from, similar to topics.
braedon
commented
5 years ago
When the exporter is fully caught up, the lag reports as 1 instead of 0.
Topic highwaters are the offset where the next message will be written. Since the exporter is subtracting the most recently read message, this will result in a difference of 1.
We don't see this for the normal lag metric because consumer groups commit the offset they should begin reading from, similar to topics.