This is a simple exporter which exports the information
provided by `wg show all dump` to prometheus.
Co-authored-by: Franz Pletz <fpletz@fnordicwalking.de>
https://humdi.net/vnstat/CHANGES
* enable tests
* add hardening options from upstream's
example service
* fix "documentation" setting in service:
either needs to be `unitConfig.Documentation`
(uppercase) or lowercase but not within unitConfig.
This makes sure that when a user hasn't set a Prometheus option it
won't show up in the prometheus.yml configuration file. This results
in smaller and easier to understand configuration files.
We previously filtered out the `_module` attribute in a NixOS
configuration by filtering it using the option's `apply` function.
This meant that every option that had a submodule type needed to have
this apply function. Adding this function is easy to forget thus this
mechanism is error prone.
We now recursively filter out the `_module` attributes at the place we
construct the Prometheus configuration file. Since we now do the filtering
centrally we don't have to do it per option making it less prone to errors.
This results in a smaller prometheus.yml config file.
It also allows us to use the same options for both prometheus-1 and
prometheus-2 since the new options for prometheus-2 default to null
and will be filtered out if they are not set.
This results in a simpler service unit which doesn't first have to
start a shell:
> cat /nix/store/s95nsr8zbkblklanqpkiap49mkwbaq45-unit-alertmanager.service/alertmanager.service
...
ExecStart=/nix/store/4g784lwcy7kp69hg0z2hfwkhjp2914lr-alertmanager-0.16.2-bin/bin/alertmanager \
--config.file /nix/store/p2c7fyi2jkkwq04z2flk84q4wyj2ggry-checked-config \
--web.listen-address [::1]:9093 \
--log.level warn
...
As the configuration for the exporters and alertmanager is unchanged
between the two major versions this patch tries to minimize
duplication while at the same time as there's no upgrade path from 1.x
to 2.x, it allows running the two services in parallel. See also #56037
https://github.com/golang/go/issues/9334 describes how net.Listen (as used by Alertmanager):
* listens on 127.0.0.1 if the listenAddress is "localhost"
* listens on all interfaces if the listenAddress is ""
munin_update relies on a stats file that exists, but isn't found in the
default location on NixOS; the appropriate plugin configuration is
added.
munin_stats relies on munin-cron writing a logfile, which the NixOS
build of munin does not. (This is probably fixable in the munin package,
but I don't have time to dig into that right now.)
This permits custom styling of the generated HTML without needing to
build your own Munin package from source. Also comes with an example
that works as a passable dark theme for Munin.
extraAutoPlugins lets you list plugins and plugin directories to be
autoconfigured, and extraPlugins lets you enable plugins on a one-by-one
basis. This can be used to enable plugins from contrib (although you'll
need to download and check out contrib yourself, then point these
options at it), or plugins you've written yourself.
munin-graph is hardcoded to use DejaVu Mono for the graph legends; if it
can't find it, there's no guarantee it finds a monospaced font at all,
and if it can't find a monospaced font the legends come out badly
misformatted.
