Recover padding is simply a line in the metadata file that gets created when Splunk needs to fix/recover metadata. Host values are an example of metadata, which are contained in a file called Hosts.data. You can simply ignore these names, although they can be a bit annoying when looking at your summary page.
To fix the summary page, you can modify the default summary dashboard to include the following additional query terms for the metadata search:
| search host!=*recover-padding*
So, any time you use a metadata search you will need to append the above, similar to this complete search:
| metadata type=hosts | search host!=*recover-padding*
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