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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+# SNMP schema
+To show the [OID](https://en.wikipedia.org/wiki/Object_identifier)'s supported by the MIB, use the snmptranslate command. Here's an example:
+```
+snmptranslate -Pu -Tz -M ~/git/ceph/monitoring/snmp:/usr/share/snmp/mibs -m CEPH-MIB
+```
+*The `snmptranslate` command is in the net-snmp-utils package*
+
+The MIB provides a NOTIFICATION only implementation since ceph doesn't have an SNMP
+agent feature.
+
+## Integration
+The SNMP MIB is has been aligned to the Prometheus rules. Any rule that defines a 
+critical alert should have a corresponding oid in the CEPH-MIB.txt file. To generate
+an SNMP notification, you must use an SNMP gateway that the Prometheus Alertmanager
+service can forward alerts through to, via it's webhooks feature.
+
+ 
+
+## SNMP Gateway
+The recommended SNMP gateway is https://github.com/maxwo/snmp_notifier. This is a widely
+used and generic SNMP gateway implementation written in go. It's usage (syntax and
+parameters) is very similar to Prometheus, AlertManager and even node-exporter.
+
+ 
+## SNMP OIDs
+The main components of the Ceph MIB is can be broken down into discrete areas
+
+
+```
+internet private enterprise   ceph   ceph    Notifications   Prometheus  Notification
+                               org  cluster   (alerts)         source      Category
+1.3.6.1   .4     .1          .50495   .1        .2               .1         .2  (Ceph Health)
+                                                                            .3  (MON)
+                                                                            .4  (OSD)
+                                                                            .5  (MDS)
+                                                                            .6  (MGR)
+                                                                            .7  (PGs)
+                                                                            .8  (Nodes)
+                                                                            .9  (Pools)
+                                                                            .10  (Rados)
+                                                                            .11 (cephadm)
+                                                                            .12 (prometheus)
+
+```
+Individual alerts are placed within the appropriate alert category. For example, to add
+a notification relating to a MGR issue, you would use the oid 1.3.6.1.4.1.50495.1.2.1.6.x
+
+The SNMP gateway also adds additional components to the SNMP notification ;
+
+| Suffix | Description |
+|--------|-------------|
+| .1 | The oid |
+| .2 | Severity of the alert. When an alert is resolved, severity is 'info', and the description is set to Status:OK|
+| .3 | Text of the alert(s) |