Hi,

I'm working on an experimental native histogram implementation in 
client_java.

Looking at client_golang, it seems you can observe math.Inf(), and bucket 
index math.MaxInt32 is used to represent the Inf bucket.

<https://github.com/prometheus/client_golang/blob/95cf173f1965388665dcb2a28971f35af280e3a5/prometheus/histogram.go#L589-L590>
https://github.com/prometheus/client_golang/blob/95cf173f1965388665dcb2a28971f35af280e3a5/prometheus/histogram.go#L589-L590

I'm wondering how to represent the Inf bucket as a BucketSpan in protobuf.
Initially I set the offset to current index minus previous index, but 
obviously that doesn't work if the current index is MaxInt32.

Any ideas?

Not sure if this is covered in client_golang either 
https://github.com/prometheus/client_golang/blob/95cf173f1965388665dcb2a28971f35af280e3a5/prometheus/histogram.go#L1272-L1280

Fabian

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