Update SM doc for alert per object (#107420)

Update stack monitoring doc to account for alert notification now being send for each node, index, or cluster based on the rule type, instead of always per cluster (PR# 102544)

docs/user/monitoring/kibana-alerts.asciidoc

@@ -32,44 +32,39 @@ To review and modify all available rules, click *Enter setup mode* on the
 
 This rule checks for {es} nodes that run a consistently high CPU load. By
 default, the condition is set at 85% or more averaged over the last 5 minutes.
-The rule is grouped across all the nodes of the cluster by running checks on a
-schedule time of 1 minute with a re-notify interval of 1 day.
+The default rule checks on a schedule time of 1 minute with a re-notify interval of 1 day.
 
 [discrete]
 [[kibana-alerts-disk-usage-threshold]]
 == Disk usage threshold
 
 This rule checks for {es} nodes that are nearly at disk capacity. By default,
-the condition is set at 80% or more averaged over the last 5 minutes. The rule
-is grouped across all the nodes of the cluster by running checks on a schedule
-time of 1 minute with a re-notify interval of 1 day.
+the condition is set at 80% or more averaged over the last 5 minutes. The default rule
+checks on a schedule time of 1 minute with a re-notify interval of 1 day.
 
 [discrete]
 [[kibana-alerts-jvm-memory-threshold]]
 == JVM memory threshold
 
 This rule checks for {es} nodes that use a high amount of JVM memory. By
 default, the condition is set at 85% or more averaged over the last 5 minutes.
-The rule is grouped across all the nodes of the cluster by running checks on a
-schedule time of 1 minute with a re-notify interval of 1 day. 
+The default rule checks on a schedule time of 1 minute with a re-notify interval of 1 day. 
 
 [discrete]
 [[kibana-alerts-missing-monitoring-data]]
 == Missing monitoring data
 
 This rule checks for {es} nodes that stop sending monitoring data. By default, 
-the condition is set to missing for 15 minutes looking back 1 day. The rule is
-grouped across all the {es} nodes of the cluster by running checks on a schedule
+the condition is set to missing for 15 minutes looking back 1 day. The default rule checks on a schedule
 time of 1 minute with a re-notify interval of 6 hours. 
 
 [discrete]
 [[kibana-alerts-thread-pool-rejections]]
 == Thread pool rejections (search/write)
 
 This rule checks for {es} nodes that experience thread pool rejections. By 
-default, the condition is set at 300 or more over the last 5 minutes. The rule
-is grouped across all the nodes of the cluster by running checks on a schedule
-time of 1 minute with a re-notify interval of 1 day. Thresholds can be set
+default, the condition is set at 300 or more over the last 5 minutes. The default rule
+checks on a schedule time of 1 minute with a re-notify interval of 1 day. Thresholds can be set
 independently for `search` and `write` type rejections.
 
 [discrete]
@@ -78,18 +73,16 @@ independently for `search` and `write` type rejections.
 
 This rule checks for read exceptions on any of the replicated {es} clusters. The
 condition is met if 1 or more read exceptions are detected in the last hour. The
-rule is grouped across all replicated clusters by running checks on a schedule 
-time of 1 minute with a re-notify interval of 6 hours. 
+default rule checks on a schedule time of 1 minute with a re-notify interval of 6 hours. 
 
 [discrete]
 [[kibana-alerts-large-shard-size]]
 == Large shard size
 
 This rule checks for a large average shard size (across associated primaries) on
 any of the specified index patterns in an {es} cluster. The condition is met if
-an index's average shard size is 55gb or higher in the last 5 minutes. The rule
-is grouped across all indices that match the default pattern of `-.*` by running
-checks on a schedule time of 1 minute with a re-notify interval of 12 hours.
+an index's average shard size is 55gb or higher in the last 5 minutes. The default rule
+matches the pattern of `-.*` by running checks on a schedule time of 1 minute with a re-notify interval of 12 hours.
 
 [discrete]
 [[kibana-alerts-cluster-alerts]]