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v0 (supported in 0.8.1 or later)
OffsetCommitRequest => ConsumerGroupId [TopicName [Partition Offset Metadata]]
  ConsumerGroupId => string
  TopicName => string
  Partition => int32
  Offset => int64
  Metadata => string

 
v1 (supported in 0.8.2 or later)
OffsetCommitRequest => ConsumerGroupId ConsumerGroupGenerationId ConsumerId [TopicName [Partition Offset TimeStamp Metadata]]
  ConsumerGroupId => string
  ConsumerGroupGenerationId => int32
  ConsumerId => string
  TopicName => string
  Partition => int32
  Offset => int64
  TimeStamp => int64
  Metadata => string

v2 (supported in 0.89.30 or later)
OffsetCommitRequest => ConsumerGroup ConsumerGroupGenerationId ConsumerId RetentionTime [TopicName [Partition Offset Metadata]]
  ConsumerGroupId => string
  ConsumerGroupGenerationId => int32
  ConsumerId => string
  RetentionTime => int64
  TopicName => string
  Partition => int32
  Offset => int64
  Metadata => string