Once again: “503 Service Unavailable” error when trying to access our web site

Our web site https://confluence.org/ is unavailable. The web server returns:

503 Service Unavailable

No server is available to handle this request.

We had (and reported) the same problem back in December, but the problem got solved within a few hours (without any explanation)

Now the error is:
Unable to connect to database. Please try again later. 1040

Now the web site is up again. (Again, without any explanation.)

The database for this site had some queries that were ‘getting stuck’ and their processing wasn’t completing. After clearing these, the site worked again. It may be helpful to investigate this in more detail in a ticket.

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