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This metric takes quite a bit of evaluation time due to the large
cardinality of node_systemd_unit_state, and is unused.

Part of the optimization work in issue #51.

Display nice HTTP error pages where possible

See merge request !34

Add a favicon on all managed sites

See merge request !33

This just intercepts the /favicon.ico URL at the nginx level, if the
site defines its own (at a different URL), that one will be used instead.

Parameterize SSO ACL rules

See merge request !32

nginx: force cache directory ownership

See merge request !31

Turns out MemoryLimit= includes swap memory, not ideal.

This reverts commit 0ed7d159.

Nginx certbot

See merge request !30

ai3/prod#31

See also ai3/prod#31

mariadb: turn up log_warnings

See merge request !28

https://mariadb.com/kb/en/library/error-log/#configuring-the-error-log-verbosity

This reverts commit dd609e0e.

We are quite confident this won't fix the issue

Ignore port, the current version works only if the selected hostname
runs on the first port.

base: blacklist systemd device units metrics

See merge request !27

Can grow into a lot of metrics for dubious value to operators

nginx: proxy to acmeserver's port

See merge request !26

Fix proxy

See merge request !25

using same configuration as in https://www.digitalocean.com/community/tutorials/understanding-nginx-http-proxying-load-balancing-buffering-and-caching

This reverts commit 7f991cb4.