MB-53077 Add support for memory threshold alert

Change-Id: I16644a5bfdb945513bb9440d9e614851012c6cb2
Reviewed-on: https://review.couchbase.org/c/couchbase-cli/+/178164
Well-Formed: Restriction Checker
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Dave Finlay <dave.finlay@couchbase.com>

Author: timofey-barmin

cbmgr.py

@@ -2101,6 +2101,8 @@ def __init__(self):
                            action="store_true", help="Alert when clocks on two servers are more than five seconds apart")
         group.add_argument("--alert-communication-issue", dest="alert_communication_issue",
                            action="store_true", help="Alert when nodes are experiencing communication issues")
+        group.add_argument("--alert-memory-threshold", dest="alert_memory_threshold",
+                           action="store_true", help="Alert when system memory usage exceeds threshold")
 
     def execute(self, opts):
         rest = ClusterManager(opts.cluster, opts.username, opts.password, opts.ssl, opts.ssl_verify,
@@ -2147,6 +2149,8 @@ def execute(self, opts):
             alerts.append('ep_clock_cas_drift_threshold_exceeded')
         if opts.alert_communication_issue:
             alerts.append('communication_issue')
+        if opts.alert_memory_threshold:
+            alerts.append('memory_threshold')
 
         enabled = "true"
         if opts.enabled == "0":

docs/generated/doc/couchbase-cli/couchbase-cli-setting-alert.html

@@ -619,6 +619,11 @@ <h2 id="_options">OPTIONS</h2>
 <p>Specifies that an email alert should be sent when nodes are experiencing
 communication issues.</p>
 </dd>
+<dt class="hdlist1">--alert-memory-threshold</dt>
+<dd>
+<p>Specifies that an email alert should be sent when any node&#8217;s system memory
+usage exceeds a threshold</p>
+</dd>
 </dl>
 </div>
 </div>

docs/generated/man/man1/couchbase-cli-setting-alert.1

@@ -2,12 +2,12 @@
 .\"     Title: couchbase-cli-setting-alert
 .\"    Author: Couchbase
 .\" Generator: Asciidoctor 2.0.10
-.\"      Date: 2021-04-22
+.\"      Date: 2022-07-28
 .\"    Manual: Couchbase CLI Manual
 .\"    Source: Couchbase CLI 1.0.0
 .\"  Language: English
 .\"
-.TH "COUCHBASE\-CLI\-SETTING\-ALERT" "1" "2021-04-22" "Couchbase CLI 1.0.0" "Couchbase CLI Manual"
+.TH "COUCHBASE\-CLI\-SETTING\-ALERT" "1" "2022-07-28" "Couchbase CLI 1.0.0" "Couchbase CLI Manual"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -213,6 +213,12 @@ machines in the cluster are more that five seconds apart.
 Specifies that an email alert should be sent when nodes are experiencing
 communication issues.
 .RE
+.sp
+\-\-alert\-memory\-threshold
+.RS 4
+Specifies that an email alert should be sent when any node\(cqs system memory
+usage exceeds a threshold
+.RE
 .SH "HOST FORMATS"
 .sp
 When specifying a host for the couchbase\-cli command the following formats are expected:

docs/modules/cli/pages/cbcli/couchbase-cli-setting-alert.adoc

@@ -128,6 +128,10 @@ include::{partialsdir}/cbcli/part-common-options.adoc[]
   Specifies that an email alert should be sent when nodes are experiencing
   communication issues.
 
+--alert-memory-threshold::
+  Specifies that an email alert should be sent when any node's system memory
+  usage exceeds a threshold
+
 include::{partialsdir}/cbcli/part-host-formats.adoc[]
 
 == EXAMPLES