Auto routing periodic update is chatty about unsupported repositories

Start Nexus and leave it for some time. Nexus logs will contain redundant lines about "unsupported" repositories, like this example below:

jvm 1 | 2013-05-06 15:13:44 INFO [y-main-thread-1] org.eclipse.jetty.server.AbstractConnector - Started InstrumentedSelectChannelConnector@0.0.0.0:8081
jvm 1 | 2013-05-06 15:13:47 INFO [qtp374387661-73] <unknown-user> /nexus - nexus: [Noelios Restlet Engine] - Attaching application: org.sonatype.nexus.rest.NexusApplication@4858537e to URI: /nexus
jvm 1 | 2013-05-06 16:13:42 INFO [ar-4-thread-4 ] org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl - Repository "Central M1 shadow" [id=central-m1][contentClass=Maven1][mainFacet=org.sonatype.nexus.proxy.maven.MavenShadowRepository] unsupported by automatic routing feature
jvm 1 | 2013-05-06 16:13:43 INFO [ar-4-thread-1 ] org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl - Updated and published prefix file of "Public Repositories" [id=public]
jvm 1 | 2013-05-06 17:13:42 INFO [ar-4-thread-5 ] org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl - Repository "Central M1 shadow" [id=central-m1][contentClass=Maven1][mainFacet=org.sonatype.nexus.proxy.maven.MavenShadowRepository] unsupported by automatic routing feature
jvm 1 | 2013-05-06 18:13:42 INFO [ar-4-thread-1 ] org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl - Repository "Central M1 shadow" [id=central-m1][contentClass=Maven1][mainFacet=org.sonatype.nexus.proxy.maven.MavenShadowRepository] unsupported by automatic routing feature
jvm 1 | 2013-05-06 19:13:42 INFO [ar-4-thread-5 ] org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl - Repository "Central M1 shadow" [id=central-m1][contentClass=Maven1][mainFacet=org.sonatype.nexus.proxy.maven.MavenShadowRepository] unsupported by automatic routing feature
jvm 1 | 2013-05-06 20:13:42 INFO [ar-4-thread-1 ] org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl - Repository "Central M1 shadow" [id=central-m1][contentClass=Maven1][mainFacet=org.sonatype.nexus.proxy.maven.MavenShadowRepository] unsupported by automatic routing feature

As M1 repo is unsupported, it's prefix list will be un-initialised, and that will be considered as "error" by logic, hence, every hour (every "tick") auto-routing will try to update it, but will write out this log above instead. Check the log timestamps, and you can see it was nagging every hour.

Note: affects version set to 2.5 but 2.4 might be affected too.