[DOCS] Alert creation delay (#3667)

(cherry picked from commit 24595b5)

docs/en/observability/infrastructure-threshold-alert.asciidoc

@@ -30,6 +30,7 @@ Conditions for each rule can be applied to specific metrics relating to the inve
 You can choose the aggregation type, the metric, and by including a warning threshold value, you can be
 alerted on multiple threshold values based on severity scores. When creating the rule, you can still get
 notified if no data is returned for the specific metric or if the rule fails to query {es}.
+You can also set advanced options such as the number of consecutive runs that must meet the rule conditions before an alert occurs.
 
 In this example, Kubernetes Pods is the selected inventory type. The conditions state that you will receive
 a critical alert for any pods within the `ingress-nginx` namespace with a memory usage of 95% or above

docs/en/observability/metrics-threshold-alert.asciidoc

@@ -59,6 +59,9 @@ When you select *Alert me if a group stops reporting data*, the rule is triggere
 If you include the same field in both your **Filter** and your **Group by**, you may receive fewer results than you're expecting. For example, if you filter by `cloud.region: us-east`, then grouping by `cloud.region` will have no effect because the filter query can only match one region.
 ==============================================
 
+In the *Advanced options*, you can change the number of consecutive runs that must meet the rule conditions before an alert occurs.
+The default value is `1`.
+
 [discrete]
 [[action-types-metrics]]
 == Action types

docs/en/observability/slo-burn-rate-alert.asciidoc

@@ -22,6 +22,7 @@ To create your SLO burn rate rule:
 . Set your long lookback period under *Lookback period (hours)*. Your short lookback period is set automatically.
 . Set your *Burn rate threshold*. Under this field, you'll see how long you have until your error budget is exhausted.
 . Set how often the condition is evaluated in the *Check every* field.
+. Optionally, change the number of consecutive runs that must meet the rule conditions before an alert occurs in the *Advanced options*.
 
 [discrete]
 [[action-types-slo]]