Message count does not consider offset 0 (v0.21.2)

[DannyVarod]

The message count ignores offset 0, leading to 1 less per partition and in total p less, where p is the number of partitions.

E.g. if you publish 100K messages to a single topic with 2 partitions, a possible result will be:

99,998 total messages

• In partition 0: offsets between 0 and 50264 with total of 50,264 messages
• In partition 1: offsets between 0 and 49734 with total of 49,734 messages

Whereas expected result should be:

100,000 total messages

• In partition 0: offsets between 0 and 50264 with total of 50,265 messages
• In partition 1: offsets between 0 and 49734 with total of 49,735 messages

I found this issue in the following UI sections:

• Inspect-->Leaders
• Inspect-->Replicas
• Observe-->Message Topics
• Observe-->Topic Offsets