mod_http_admin_api: metrics: Filter out a value that is commonly nan at startup The upload bytes count is typically nan at startup, which cannot legally be encoded in JSON. I haven't assessed whether any other metrics might emit nan under other circumstances, but this fixes the most visible issue right now.

---
labels:
- 'Stage-Obsolete'
summary: 'XEP-0313: Message Archive Management'
superseded_by: mod_mam
...

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