The type of the ingest route to query. These types correspond to the various source dataset schemas supported by Observe.
any refers to the "default" generic source dataset schema with the FIELDS and EXTRA columns. All of the others
correspond to direct-write source datasets. Each type is also associated with particular ingest HTTP endpoints that emit
compatible data for that type. Incoming data on a given endpoint is routable to any dataset of the corresponding type.

The following [type -> ingest path] mappings are defined:

• otellogs <-> /v1/otel/v1/logs
• otelmetrics <-> /v1/otel/v1/metrics
• oteltraces <-> /v1/otel/v1/traces
• prometheus <-> /v1/prometheus
• k8sentity <-> /v1/kubernetes
• any <-> /v1/*

OPAL expression acting as the match predicate for this route, compiled against the destination dataset's schema. A compile error is rejected with a 400.

Pass an empty string to create the type's default route, the catch-all evaluated after every other route. Once a default route exists, an empty pipeline is rejected with a 400.

Two restrictions apply per type:

• oteltraces supports only the default route. A non-empty pipeline is rejected with a 400.
• Some types restrict which columns the expression may reference: prometheus, k8sentity, and oteltraces allow only meta; otelmetrics allows meta and metric. otellogs and any are unrestricted. Referencing any other column is rejected with a 400.

Unlike a drop filter, a route predicate that fails at evaluation time fails the whole bundle rather than failing open. Expressions are therefore rejected at creation if they reference columns that cannot be resolved.

Primary destination dataset ID. Must be a source dataset whose type matches the type path parameter.

Optional secondary destination dataset ID, subject to the same type check as destinationId. When set, matching observations are written to both destinations. Omit to leave unset; use PATCH with an explicit null to clear it later.