announcer: inject hostname in case fqdn cannot be found

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 28.02%. Comparing base (c5122b8) to head (ba97836).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3087 +/- ## ======================================= Coverage 28.02% 28.02% ======================================= Files 86 86 Lines 14981 14981 ======================================= Hits 4199 4199 Misses 10782 10782 ```

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