prometheus: Move the OOM alert for build hosts to a longer timeframe

See merge request !908

Signed-off-by: Christian Heusel <christian@heusel.eu>

There is not much value in knowing when one of our build hosts has no
more memory left as all of them have plenty of swap available.
Additionally these rules trigger quite often even for short spikes.

Signed-off-by: Christian Heusel <christian@heusel.eu>

Fixes: c4f13d3a ("archweb: Redirect /pacman/ to new pacman subdomain[1]")

Fixes: 05028990 ("Adapt to new Hetzner plans[1] for lower cost and better specs!")

dovecot: Adapt mediator mailbox for new mediators

See merge request !904

Link: https://lists.archlinux.org/archives/list/staff@lists.archlinux.org/message/3JNJQJ7O3LBIXST2EFBCAKM2HCHXJZUM/


Signed-off-by: Christian Heusel <christian@heusel.eu>

archwiki: Update to 1.42.4-2

See merge request !901

Signed-off-by: Christian Heusel <christian@heusel.eu>

Postfix cleanup

Closes #365

See merge request !462

This was added more than 7 years ago[1] and has not been relevant for a
long time.

[1] d32ce421 ("postfix: Remove compat_maps")

Please see the reject_authenticated_sender_login_mismatch option[1] for
more details.

For now service accounts are not restricted in any way, this should be
improved in the further.

[1] https://www.postfix.org/postconf.5.html#reject_authenticated_sender_login_mismatch

Fix #365

This removes unnecessary parameters, mostly for one of these reasons:
the value is already the default value, the default value is good
enough, or the parameter is not used in our case.

A bit of reordering/"tidying" was also done.

I think it was added to improve the mail reputation (avoid being
filtered as spam), but at lot has changed since it was added (+5 years
ago), so let's remove it.

Improve time robustness by switching to chrony, trustworthy time sources and NTS

See merge request !860

From chrony FAQ[1]:
"1.2. Should I prefer chrony over timesyncd if I do not need to run a
server?

Generally, yes.

systemd-timesyncd is a very simple NTP client included in the systemd
suite. It lacks almost all features of chrony and other advanced client
implementations listed on the comparison page. One of its main
limitations is that it cannot poll multiple servers at the same time and
detect servers having incorrect time (falsetickers in the NTP
terminology). It should be used only with trusted reliable servers,
ideally in local network.

Using timesyncd with pool.ntp.org is problematic. The pool is very
robust as a whole, but the individual servers run by volunteers cannot
be relied on. Occasionally, servers drift away or make a step to distant
past or future due to misconfiguration, problematic implementation, and
other bugs (e.g. in firmware of a GPS receiver). The pool monitoring
system detects such servers and quickly removes them from the pool DNS,
but clients like timesyncd cannot recover from that. They follow the
server as long as it claims to be synchronised. They need to be
restarted in order to get a new address from the pool DNS.

Note that the complexity of NTP and clock synchronisation is on the
client side. The amount of code in chrony specific to NTP server is very
small and it is disabled by default. If it was removed, it would not
significantly reduce the amount of memory or storage needed."

This commit fixes the issue by switching to a proper NTP client
(chrony), trustworthy time sources from Netnod and
Physikalisch-Technische Bundesanstalt which distributes the official
time for Sweden[2] and Germany[3] respectively, and finally NTS is used
to protect against MITM attacks.

Since most of our servers are in Germany or Finland (close to Sweden),
it makes sense to use these time sources as a low round-trip delay[4] is
preferred for NTP. For the few servers[5] we have outside Europe, the
root delay[4] will be higher than desired, but with the current use-case
for these servers, it should not be a problem.

[1] https://chrony-project.org/faq.html#_should_i_prefer_chrony_over_timesyncd_if_i_do_not_need_to_run_a_server
[2] https://www.netnod.se/swedish-distributed-time-service
[3] https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time.html
[4] https://blog.meinbergglobal.com/2021/02/25/the-root-of-all-timing-understanding-root-delay-and-root-dispersion-in-ntp/
[5] {america,asia,sydney}.mirror.pkgbuild.com

Fix some inconsistencies in ansible playbooks / roles

Closes #541

See merge request !899

Robin Candau authored 3 months ago and Robin Candau committed 2 months ago

See https://github.com/ansible/ansible/pull/77644

tf-stage1: Increase debuginfod.archlinux.org disk size

See merge request !900

The amount of disk space that the debug packages used to extract the
debuginfo seems to use is growing and we are getting notifications about
93% disk utilization.
That's a bit too close to maximum usage and we should just make sure to
increase it to be outside of our own thresholds.

Signed-off-by: Christian Heusel <christian@heusel.eu>

[1] https://archlinux.org/news/git-migration-completed/

Add Loki recording rules and Grafana dashboard for tracking cache hit ratio, HTTP version and TLS version.

See merge request !865

It has three panels showing "Cache hit ratio", "HTTP version" and "TLS
version".

The metrics are generated with Loki recording rules (see the previous
three commits).

This enables us to calculate the cache hit ratio, which may help
determine whether more caching would be beneficial.

Please note that this only counts requests for which caching is enabled
(e.g. {fastcgi,proxy}_cache is configured), e.g. for static served files
cache_status will be "".

[1] http://nginx.org/en/docs/http/ngx_http_upstream_module.html#var_upstream_cache_status

Mainly because we are curious. The data may also be used to decide if we
want to drop older versions of TLS.

The plan is to use this for creating metrics from the nginx log lines
(e.g. requests per second).

[1] https://grafana.com/docs/loki/latest/alert/#recording-rules

Fixes: bd19c007 ("Add configuration to retain prometheus data for 1 year")

Reduce heftig's access to the default vault and the Matrix server

Closes #567

See merge request !796

heftig has agreed to have his access reduced, as a way to reduce the
number of people with access to the "super" vault.

With this change the matrix vault is moved from the "super" vault to the
"default" vault as that is needed for maintaining the matrix server.

Fix #567

mariadb: Add switch for innodb_snapshot_isolation

See merge request !896

With the 11.6.2 release mariadb has made snapshot isolation a default
setting which recently caused issues on the AUR and the Forums, where
the respective database engines would fail due to the table changing
since the last time they read it:

    PHP Fatal error:  Uncaught mysqli_sql_exception: Record has changed since last read in table 'fluxbb_online' in /srv/http/fluxbb/include/dblayer/mysqli_innodb.php:79
    Stack trace:
    #0 /srv/http/fluxbb/include/dblayer/mysqli_innodb.php(79): mysqli_query()
    #1 /srv/http/fluxbb/include/functions.php(485): DBLayer->query()
    #2 /srv/http/fluxbb/include/common.php(162): update_users_online()
    #3 /srv/http/fluxbb/viewtopic.php(10): require('...')
    #4 {main}

We therefore introduce a config switch to restore the old behavior and
apply the changed setting on the two services.

Link: https://mariadb.com/kb/en/mariadb-11-6-2-release-notes/#innodb
Link: https://bbs.archlinux.org/viewtopic.php?id=301802
Link: archlinux/aurweb#525


Signed-off-by: Christian Heusel <christian@heusel.eu>

Onboard ptr1337 as Package Maintainer

See merge request !895

Peter has previously been a Junior Package Maintainer and since the two
month period is now up and his changes in the packaging ecosystem
were all good so far they can be promoted as outlined in RFC 14.

Signed-off-by: Christian Heusel <christian@heusel.eu>

Repos are growing and we were getting notifications about 91% utilization.
That's a bit close IMO and we should just make sure to increase it to be outside
of our own thresholds.

The project membership must also be extended, if not the user is simply
deleted when the membership expires (defeating the purpose of extending
the access tokens).

Fixes: 639101e6 ("gitlab: Add ruby script for continuous extending of bot tokens")