Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+Zabbix Module
+=============
+
+The Zabbix module actively sends information to a Zabbix server like:
+
+- Ceph status
+- I/O operations
+- I/O bandwidth
+- OSD status
+- Storage utilization
+
+Requirements
+------------
+
+The module requires that the *zabbix_sender* executable is present on *all*
+machines running ceph-mgr. It can be installed on most distributions using
+the package manager.
+
+Dependencies
+^^^^^^^^^^^^
+Installing zabbix_sender can be done under Ubuntu or CentOS using either apt
+or dnf.
+
+On Ubuntu Xenial:
+
+::
+
+    apt install zabbix-agent
+
+On Fedora:
+
+::
+
+    dnf install zabbix-sender
+
+
+Enabling
+--------
+You can enable the *zabbix* module with:
+
+::
+
+    ceph mgr module enable zabbix
+
+Configuration
+-------------
+
+Two configuration keys are vital for the module to work:
+
+- zabbix_host
+- identifier (optional)
+
+The parameter *zabbix_host* controls the hostname of the Zabbix server to which
+*zabbix_sender* will send the items. This can be a IP-Address if required by
+your installation.
+
+The *identifier* parameter controls the identifier/hostname to use as source
+when sending items to Zabbix. This should match the name of the *Host* in
+your Zabbix server.
+
+When the *identifier* parameter is not configured the ceph-<fsid> of the cluster
+will be used when sending data to Zabbix.
+
+This would for example be *ceph-c4d32a99-9e80-490f-bd3a-1d22d8a7d354*
+
+Additional configuration keys which can be configured and their default values:
+
+- zabbix_port: 10051
+- zabbix_sender: /usr/bin/zabbix_sender
+- interval: 60
+- discovery_interval: 100
+
+Configuration keys
+^^^^^^^^^^^^^^^^^^^
+
+Configuration keys can be set on any machine with the proper cephx credentials,
+these are usually Monitors where the *client.admin* key is present.
+
+::
+
+    ceph zabbix config-set <key> <value>
+
+For example:
+
+::
+
+    ceph zabbix config-set zabbix_host zabbix.localdomain
+    ceph zabbix config-set identifier ceph.eu-ams02.local
+
+The current configuration of the module can also be shown:
+
+::
+
+   ceph zabbix config-show
+
+
+Template
+^^^^^^^^
+A `template <https://raw.githubusercontent.com/ceph/ceph/master/src/pybind/mgr/zabbix/zabbix_template.xml>`_. 
+(XML) to be used on the Zabbix server can be found in the source directory of the module.
+
+This template contains all items and a few triggers. You can customize the triggers afterwards to fit your needs.
+
+
+Multiple Zabbix servers
+^^^^^^^^^^^^^^^^^^^^^^^
+It is possible to instruct zabbix module to send data to multiple Zabbix servers.
+
+Parameter *zabbix_host* can be set with multiple hostnames separated by commas.
+Hosnames (or IP adderesses) can be followed by colon and port number. If a port
+number is not present module will use the port number defined in *zabbix_port*.
+
+For example:
+
+::
+
+    ceph zabbix config-set zabbix_host "zabbix1,zabbix2:2222,zabbix3:3333"
+
+
+Manually sending data
+---------------------
+If needed the module can be asked to send data immediately instead of waiting for
+the interval.
+
+This can be done with this command:
+
+::
+
+    ceph zabbix send
+
+The module will now send its latest data to the Zabbix server.
+
+Items discovery is accomplished also via zabbix_sender, and runs every `discovery_interval * interval` seconds. If you wish to launch discovery 
+manually, this can be done with this command:
+
+::
+
+    ceph zabbix discovery
+
+
+Debugging
+---------
+
+Should you want to debug the Zabbix module increase the logging level for
+ceph-mgr and check the logs.
+
+::
+
+    [mgr]
+        debug mgr = 20
+
+With logging set to debug for the manager the module will print various logging
+lines prefixed with *mgr[zabbix]* for easy filtering.