openrtb.2.5.imp.metric

What it means

OpenRTB 2.5 introduced imp.metric, metric, which openRTB 2.5 introduced the Metric object for historical viewability, CTR, and similar signals..

Why it matters

imp.metric is only defined from 2.5 onward. Used against an earlier version it is not valid, and a consumer below 2.5 treats it as an unknown field.

How to fix it

Target OpenRTB 2.5 or later when you send imp.metric, and make sure the value matches the type and any enum the specification defines for it.

Paste your bid request into the tester and select OpenRTB 2.5 to see whether this rule fires against your payload.

Reference

• Specification section: Section 3.2.4 / 3.2.5
• Source: OpenRTB 2.6 Appendix B: Version 2.4 to 2.5

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