PromQL: presence functions (absent/absent_over_time/present_over_time) unsupported

[zzylol]

Summary

Presence functions absent, absent_over_time, present_over_time parse but are rejected (UnsupportedFunction).

Corpus impact

65 rejections (3.4%).

Examples

absent(up{job="prometheus"})
absent_over_time(node_exporter_build_info[1h])

Notes

• Error variant: LoweringError::UnsupportedFunction.
• absent/absent_over_time have a pin-test (absent_function_is_rejected__GAP, unsupported_functions_are_rejected) but no tracking issue.
• Semantics: emit a 1-element vector when the argument has NO matching series — requires representing "empty result → synthesized sample", which the intent algebra has no node for yet.