Munin contributed plugins

nginx_upstream_multi_: simplify configuration retrieval via environment

nginx_upstream_multi_: fix flake8 issues

Merge pull request #965 from shuehner/fix_permgen_metaspace

Fix reporting of 'Permanent Generation' / Metaspace (for java<8)

Merge pull request #963 from shuehner/more_jvms

Fix jstat* plugins to work again with java 6+7, fix PU reporting for Java8

Merge pull request #961 from bobkare/nullmailer-thresholds

Add support for configurable thresholds to nullmailer_queue plugin

Merge pull request #960 from bertptrs/plugin-timesync

Create plugin timesync_status to monitor systemd ntp.

Create plugin timesync_status to monitor systemd ntp.

Merge pull request #957 from kael-shipman/systemd_units

Added detailed filtering capabilities for systemd_units

Added check for logfile existence at top of loop

Fixed documentation for perldoc format

Addressed PR comments

Added extinfo to list affected logs and improved documentation

Bugfix and re-positioning

Added detailed filtering capabilities for systemd_units

Merge pull request #955 from kael-shipman/patch-1

Added print_{warning,critical} for greater flexibility

Accepted suggestion from maintainer

Merge pull request #953 from Slamdunk/patch-1

Nginx error: log files may be empty

Merge pull request #952 from Neraud/debsecan

Improve documentation of debsecan_ plugin and add example graphs

Fixed example graphs file names
Renamed from debsecan_pkg-FOO.png to debsecan_-FOO.png

Fixed CONFIGURATION documentation

Add a plugin for unifi (Ubiquity) gear

Plugins available:

• unifi_api - Providing the following graphs:
  • unifi_clients_by_device - Count the number of clients connected on a per-device basis
  • unifi_clients_by_network - Count the number of clients connected to each named network...

Generate cache file if missing

Don't exit with error if cache file is missing, instead refrain from sending values and daemonize() in an attempt to generate one.
Invocation using 'config' before generation is successful will fail, as mentioned in #914, but configuration will get picked up as soon as it is present.

Add sort to the du command to keep things in order of size

Plugins tc_*: check existence of "tc" during autoconf

Restructure incomplete or broken "autoconf" implementations

Some plugins with non-zero autoconf exitcodes (it must be zero instead)
deserved a bit of code cleanup for improved readability.

Improve incorrect or unspecific output for "autoconf"

Some plugins emit wrongly formatted "no" messages or lack the "yes"
message on success.

Merge pull request #940 from RubenKelevra/add_systemd_net_for_tc

network.tc*: add the ability to detect systemd based network devices

Merge pull request #938 from Neraud/git_commit_behind_fixed_shell

Git commit behind fixed shell

Plugins jstat__*: add format examples

Plugins jstat__*: add support for Java 1.8

Plugins jstat__*: mention 'graphtitle' setting in documentation

Plugins jstat__*: simplify handling of environment settings

Plugin ceph_osd: improve style and documentation

Plugin asterisk: fix typos for "unknown" dataset

The "draw" configuration as well as the "value" were ignored.

Fixed error when using a user which doesn't have a default shell (like the default munin user on Debian/Ubuntu)

Added example graphs

Changed the graph_category to file_transfer

Fixed NOTES comment to better explain the fetch munin/cron modes

Merge pull request #929 from sumpfralle/plugin-postfix-rbl-blocked-mails

Plugin postfix-rbl-blocked-mails: various improvements

Improved munin state file handling

Improved how the statefile last modified date is updated

Misc code improvements

Plugin postfix-rbl-blocked-mails: count by top-level-domain

It looks like the spamhaus domain changed from sbl-xbl.spamhaus.org to
zen.spamhaus.org. The same may have happened for other RBL domains.
Thus we just filter by the top level domain (instead of the specific...

Plugin postfix-rbl-blocked-mails: unify whitespace

Whitespace cleanup

• remove trailing whitespace
• remove empty lines at the end of files

Plugin cpu-usage-by-process: fix autoconf output

Plugin proftpd_count: fix shellcheck issues

Plugin proftpd_count: fix autoconf handling

Review and unify category assignments of plugins

Plugins xen_*: fix 'autoconf' logic and exitcode