Response field rum_steps is no longer guaranteed

What changed

Producer-side tools call this non-breaking. For a consumer it is a null dereference on an unknown future date.

Affects rum_steps on RUMOperationJourneyRum reachable from 5 operations. Nothing fails at the call; it fails wherever the value is finally used, which is usually somewhere else entirely.

can now be null

Who is affected

Code that reads Datadog's RUMOperationJourneyRum objects, used by 5 Datadog operations.

Before and after

Code that breaks

// response.rum_steps may now be absent or null
const rum_steps = response.rum_steps ?? fallback;

Based on Datadog’s published API specification. How severity is decided.