We’re happy to announce that you can now use the _time field with the Vector collector version v0.42.0 or newer.
Before Vector version v0.42.0, the Axiom sink was based on an Elasticsearch endpoint. This constrained Axiom to the Elasticsearch wire semantics. When you sent data to Axiom, you had to specify the timestamp in the @timestamp field.
Starting with Vector version v0.42.0, the Axiom sink uses the native Axiom ingest endpoint. This means that you can specify the timestamp in the _time field as usual.
For more information, see the documentation.