The good thing is prometheus is not used for electrs (or anything else on RaspiBlitz AFAIK)
The bad is that the latest Electrum v4.0.5 reportedly does not connect to electrs. Did not test it yet.
Electrum 4.0.5 definitely refuses to connect to electrs older than https://github.com/romanz/electrs/commit/c88a0dc331eb16163276becf98fcc020565d97eb I'm recompiling to see if it works with the newest version.
Confirmed, it's fixed in master. See also https://github.com/romanz/electrs/issues/331
A new release is ready: https://crates.io/crates/electrs/0.8.6
Many thanks for reporting and investigating this issue!
OK update for RaspiBlitz is merged and worked on testing. Now testing recovery.
OK recovery worked - update will be part of v1.6.2 release. Closing issue.
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OK recovery worked - update will be part of v1.6.2 release. Closing issue.