Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
[WARNING] Ignoring metadata for artifact velocity:velocity:pom:SYSTEM as it has duplicate metadata
[WARNING] Ignoring metadata for artifact org.apache.velocity:velocity:pom:SYSTEM as it has duplicate metadata

Warnings about ignored, duplicated metadata.