Return records for a data type

Takes a compact subset of PromQL and returns individual records for a data type.

The subset of PromQL supports:

• Instant and Range Vector Selectors
• @ and offset modifiers
• = and != label matchers on id, tag, and source
• Matcher grouping on or
• last_over_time() over a Range Vector, returning only the most recent matching record in the range

User-defined data types are queried with a __name__ matcher, since PromQL metric names can't contain /: {__name__="Event/<uuid>"}[1d]. Other matchers combine with it as usual ({__name__="Event/<uuid>", tag="..."}); with or, repeat the __name__ matcher in every group.

Instant Vectors deviate from typical Prometheus behavior. An un-anchored Instant Vector will return the latest record with an infinite lookback window. Anchored Instant Vectors return any records that match or fall within a duration.

Returned record schema for individual data types is available from the catalog API: data/v1/catalog/{data_type}/v1/schema