Support for InfluxDB V2 API (#15861)

* Addition of influxdb-client-php to Composer.

* Addtion of InfluxDBv2 support.

* Addition of front-end options.

* Addition of documentation.

* Addition of the acknowledgement of the PHP library used.

* Fixed a unneeded bracket.

* Addition of a basic datastore test.

* StyleCI fixes.

* StyleCI fixes.

* StyleCI fixes.

* Fixed exception class.

* Revert accidental change.

* Fix to composer lock to not update all packages.

* Fix to composer lock to not update all packages, but still include the new Influx lib.

* Another attempt at getting Composer to behave the way I think it should work.

* Fixed merge-conflict in Composer due to #15869.

* Update composer.json

* Update composer.lock

* Update composer.json

* Update composer.lock

---------

Co-authored-by: Tony Murray <murraytony@gmail.com>

doc/Extensions/Metric-Storage.md

@@ -4,7 +4,7 @@ hide_toc: true
 
 By default we ship all metrics to RRD files, either directly or via
 [RRDCached](RRDCached.md). On top of this  you can ship metrics to
-Graphite, InfluxDB, OpenTSDB or Prometheus. At present you can't use
+Graphite, InfluxDB (v1 or v2 API), OpenTSDB or Prometheus. At present you can't use
 these backends to display graphs within LibreNMS and will need to use
 something like [Grafana](https://grafana.com/).
 
@@ -13,5 +13,6 @@ the other backends then please see the documentation below.
 
 - [Graphite](metrics/Graphite.md)
 - [InfluxDB](metrics/InfluxDB.md)
+- [InfluxDBv2](metrics/InfluxDBv2.md)
 - [OpenTSDB](metrics/OpenTSDB.md)
 - [Prometheus](metrics/Prometheus.md)

doc/Extensions/metrics/InfluxDBv2.md

@@ -0,0 +1,46 @@
+# Enabling support for InfluxDBv2
+
+Before we get started it is important that you know and understand
+that InfluxDBv2 support is currently alpha at best. All it provides is
+the sending of data to a InfluxDBv2 bucket. Due to the current changes
+that are constantly being made to InfluxDB itself then we cannot
+guarantee that your data will be ok so enabling this support is at
+your own risk!
+
+It is also important to understand that InfluxDBv2 only supports the
+InfluxDBv2 API used in InfluxDB version 2.0 or higher. If you are
+looking to send data to any other version of InfluxDB than you should
+use the InfluxDB datastore instead.
+
+## Requirements
+
+- InfluxDB >= 2.0
+
+The setup of the above is completely out of scope here and we aren't
+really able to provide any help with this side of things.
+
+## What you don't get
+
+- Support for InfluxDB, we would highly recommend that you
+  have some level of experience with these.
+
+RRD will continue to function as normal so LibreNMS itself should
+continue to function as normal.
+
+## Configuration
+
+!!! setting "poller/influxdbv2"
+    ```bash
+    lnms config:set influxdbv2.enable true
+    lnms config:set influxdbv2.transport http
+    lnms config:set influxdbv2.host '127.0.0.1'
+    lnms config:set influxdbv2.port 8086
+    lnms config:set influxdbv2.bucket 'librenms'
+    lnms config:set influxdbv2.token 'admin'
+    lnms config:set influxdbv2.allow_redirect true
+    lmns config:set influxdbv2.organization 'librenms'
+    ```
+
+The same data stored within rrd will be sent to InfluxDB and
+recorded. You can then create graphs within Grafana or InfluxDB to display the
+information you need.

doc/General/Acknowledgement.md

@@ -35,6 +35,7 @@ We list below what we make use of including the license compliance.
 - Code for UBNT Devices Mark Gibbons <mgibbons@oemcomp.com> Initial code base submitted via PR721
 - [Jquery LazyLoad](http://www.appelsiini.net/projects/lazyload): MIT License
 - [influxdb-php](https://github.com/influxdb/influxdb-php): MIT License
+- [influxdb-client-php](https://github.com/influxdata/influxdb-client-php): MIT License
 - [HTML Purifier](http://htmlpurifier.org/): LGPL v2.1
 - [Symfony Yaml](https://github.com/symfony/yaml): MIT
 - [PHPMailer](https://github.com/PHPMailer/PHPMailer): LGPL v2.1