The plugin was installed to Hudson and running successfully for approx. 2 weeks. Yesterday Hudson started failing builds saying it could not find the cobertura plugin. All Hudson builds would fail for this reason, it was required to turn off the plugin. Here is the last of the build output:

[INFO] Searching repository for plugin with prefix: 'cobertura'.
[INFO] org.sonatype.plugins: checking for updates from central
[INFO] org.apache.maven.plugins: checking for updates from central
[INFO] org.codehaus.mojo: checking for updates from central
[INFO] artifact org.apache.maven.plugins:maven-cobertura-plugin: checking for updates from central
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] The plugin 'org.apache.maven.plugins:maven-cobertura-plugin' does not exist or no valid version could be found