status: 503 Service Unavailable for https://repository.jboss.org/nexus/content/groups/public/
## Summary
The Trace Compass CI jobs have been failing since last Friday with the same reason:
```
[ERROR] Plugin org.jboss.tools.tycho-plugins:repository-utils:1.7.0 or one of its dependencies could not be resolved:
Failed to read artifact descriptor for org.jboss.tools.tycho-plugins:repository-utils:jar:1.7.0:
org.jboss.tools.tycho-plugins:repository-utils:pom:1.7.0 failed to transfer from
https://repository.jboss.org/nexus/content/groups/public/ during a previous attempt.
This failure was cached in the local repository and resolution is not reattempted until the update interval
of jboss-public-repository-group has elapsed or updates are forced. Original error:
Could not transfer artifact org.jboss.tools.tycho-plugins:repository-utils:pom:1.7.0 from/to
jboss-public-repository-group (https://repository.jboss.org/nexus/content/groups/public/):
transfer failed for https://repository.jboss.org/nexus/content/groups/public/org/jboss/tools/tycho-plugins
/repository-utils/1.7.0/repository-utils-1.7.0.pom, status: 503 Service Unavailable -> [Help 1]
```
## Steps to reproduce
mvn clean install -DskipTests=true
## What is the current bug behavior?
Build is failing.
## What is the expected correct behavior?
Successful build
## Relevant logs and/or screenshots
Examples:
https://ci.eclipse.org/tracecompass/view/Testing/job/tracecompass-gerrit-short-ui-only/2138
or
https://ci.eclipse.org/tracecompass/view/Testing/job/tracecompass-gerrit-core-only/2115
issue