Prometheus remote write 2.0

What problem does the new feature solve?

With Prometheus 3.0 beta release, a version of prometheus remote write is out

https://prometheus.io/docs/specs/remote_write_spec_2_0/

GreptimeDB will keep tracking this and keep our compatibility up to date.

What does the feature do?

Implement PRW 2.0 while keeping 1.0 supported.

What's new with Remote Write 2.0

• Time-series gets a new field called start_timestamp https://github.com/prometheus/prometheus/blob/main/prompb/io/prometheus/write/v2/types.proto#L134 This is designed to provide context information for metrics like counter, to indicate when did it start. So the query engine can return correct value for rate even if there is only one sample.

Implementation challenges

No response