Munin contributed plugins

Fix wrong "example-directory" names

README: remove references for subversion

btrfs_*_usage: add example graphs

Provided by HaseHarald.
See https://github.com/munin-monitoring/contrib/pull/1114.

Touchups on configuration.

Tests: apply the exceptions to ruby-based code checks

Ruby plugins: apply code changes as suggested by "rubocop --auto-correct"

t/test-exception-wrapper: fix documentation

Unify file encodings to UTF8

lint: ignore python's compiled files for codespell

[plugin/docker_] Improvements to docker_ plugin (#1094)

• Add support for docker_network
• Actually show non running containers counts
• Show intermediate and dangling images counts
• Add warnings on dangling images and dead containers
• Fully support autoconf and suggest...

[plugins/disk/btrfs_device_usage] Reformat linebreaks.

Following suggestions from linting.

[plugins/disk/btrfs_device_usage] Fix issues brought up by CI.

- Remove trailing whitespace.
- Add whitespace around operators.
- Add linebreaks to shorten the lines.

[plugins/disk/btrfs_device_stats] Add a plugin to monitor device stats from btrfs.

Monitors the different device-counters (mostly for errors) of the disks in a btrfs pool.

plugins/puppet/puppet_runtime: fix formatting

Used rufo https://github.com/ruby-formatter/rufo

[plugins/mysql/mysql_audit] Added plugin for monitoring the audit log

Shows the number of active over time

[plugins/git/gitlab_statistics] added plugin to display GitLab stats

Graphs common GitLab statistics (user, repo, fork, ... count) using its
HTTP API statistics endpoint (requires a token to be set and passed to
the plugin)

docker_cpu: fix data for container names starting with numbers

Plugin mysql_disk_by_prefix: remove flake8 override and unused import

The flake8 line was interpreted as "ignore this file".

[plugins/user/procbyuser] added plugin to monitor processes of a user

Graphs the number of processes owned by a user over time

[plugins/user/membyuser] Minor enhancements

Don't use a fixed scale
Use resident set size as measure for a process' memory usage instead
of vsz
More robust username enumeration

Fixes quota für zvols. Without this, the log gets spammed with

2020/08/16 04:45:24 [ERROR] In RRD: Error updating /var/lib/munin/localdomain/localhost.localdomain-zfs_list_rpool__name-quota-g.rrd: /var/lib/munin/localdomain/localhost.localdomain-zfs_list_rpool__name-quota-g.rrd: Function update_pdp_prep, case DST_GAUGE - Cannot convert '-' to float

prevent duplicate graphs and unify line style

Plugin multi_tcp_ping: gracefully handle DNS resolution problems

Previously the plugin exited with an error, if the target name could not
be resolved. Now this problem is handled just like an "unreachable"
situation.

Thanks, nitram2342!

Closes: #1091

extend workaround for multiple dashes

Add plugin "rsnapshot_duration"

The plugin monitors the duration of rsnapshot backups for each single
backup source.

The duration is parsed from rsnapshot's log file. The rsnapshot
configuration setting "loglevel 3" is required.

Plugin unifi_api: handle missing error fields in response

It seems to be possible, that the response lacks the values for
`rx_errors` and `tx_errors`. This should not result in warnings due to
undefined values.

Thanks, kboenke!

Closes: #1095

[plugins/weather/wunderground] Add plugin to query station data from Weather Underground

It's a bit backwards, but works a treat when you don't own the station
but want the data in a better format.

Includes warnings on UV and heat indices, and visible lines for wind...

Modified http_request_time to allow specifying a user agent

Similar to other settings for this plugin, there is a new
env.urlN_agent setting which allows specifying a user agent

Change regex to match "prepend" pattern

Requirements workaround due to #1073

Added monitoring of router temperature

Fix geowebcache-blankitems

Plugin apache_memory: fix title description formatting

The plugin gallery and "munin-run" relies on a space after the hyphen.

Plugin apache_memory: fix spelling and mark as clean

Rename plugin "apache_memmory" to "apache_memory"

The original name was misspelled.

Plugin apache_memory: improve title

Plugin apache_memory: properly quote patterns and simplify calculation

• patterns with whitespace caused errors
• the number of processes could change between the steps for
  counting and averaging
• handle "no match" properly (returning "U" - unknown - instead of an...

Plugin apache_memory: specify common default values

Previously the plugin did not work without configuration.
Now it should work on many systems out of the box.

display units for tor_traffic

bitcoind_: update for Bitcoin Core v0.19.0 release

• Use new RPC calls to get relevant statistics, as some calls are either
  deprecated or completely removed.

• Fix response printing when MUNIN_DEBUG is set.

• Remove "fees" graph as there is no sane way to implement that....

Improved docker_ performance when getting CPU/Memory stats

Added parallel processing using python's muliprocessing module
to fork a new process each for each docker container when gathering
stats.

This vastly improves performance since using a for loop the script...

[router/freebox] fix vlabel

Signed-off-by: Olivier Mehani <shtrom@ssji.net>

Simple multigraph plugin for nextcloud

fix multicall arg

fix argument for socket version get

loop over every socket/port to get the version and use it afterwards as cache

discovering the version of rtorrent, and depending on that, using the correct functions in the xmlrpc call

Rename plugin folder, check for json

Add jitsi-videobridge plugin

Simple multigraph plugin with one graph for current session infos and one
graph for total conferences created.

Simple plugin to monitor coturn turn/stun server

... via telnet