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textparse: Update comment about timestamp_ms protobuf parsing

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By now, we know better what the plan is.

Signed-off-by: beorn7 <beorn@grafana.com>
This commit is contained in:
beorn7 2023-10-19 17:54:42 +02:00
parent 88de3d4491
commit b428416f06
1 changed files with 9 additions and 3 deletions
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12
model/textparse/protobufparse.go
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@ -148,9 +148,15 @@ func (p *ProtobufParser) Series() ([]byte, *int64, float64) {
if ts != 0 {
return p.metricBytes.Bytes(), &ts, v
}
// Nasty hack: Assume that ts==0 means no timestamp. That's not true in
// general, but proto3 has no distinction between unset and
// default. Need to avoid in the final format.
// TODO(beorn7): We assume here that ts==0 means no timestamp. That's
// not true in general, but proto3 originally has no distinction between
// unset and default. At a later stage, the `optional` keyword was
// (re-)introduced in proto3, but gogo-protobuf never got updated to
// support it. (Note that setting `[(gogoproto.nullable) = true]` for
// the `timestamp_ms` field doesn't help, either.) We plan to migrate
// away from gogo-protobuf to an actively maintained protobuf
// implementation. Once that's done, we can simply use the `optional`
// keyword and check for the unset state explicitly.
return p.metricBytes.Bytes(), nil, v
}