Create README.md

Author: franks883

Server-Side Components/Background Scripts/Tag Incident Outliers/README.md

@@ -0,0 +1,25 @@
+# Tag incident resolution outliers by z score
+
+## What this solves
+Average resolution time hides long-tail outliers. This script calculates mean and standard deviation of resolution minutes and tags incidents whose z score exceeds a threshold, helping teams investigate anomalies.
+
+## Where to use
+Run as a Background Script or convert into a Scheduled Job for periodic tagging.
+
+## How it works
+- Uses `GlideAggregate` to compute count, mean, and approximate variance
+- Calculates z score per resolved incident
+- Sets a flag field or work note on outliers above a configurable z threshold
+
+## Configure
+- `DAYS`: look-back window
+- `Z_THRESHOLD`: default 2.5
+- `FLAG_FIELD`: field to set, for example a custom boolean `u_outlier`
+
+## References
+- GlideAggregate API  
+  https://www.servicenow.com/docs/bundle/zurich-api-reference/page/app-store/dev_portal/API_reference/GlideAggregate/concept/c_GlideAggregateAPI.html
+- GlideRecord API  
+  https://www.servicenow.com/docs/bundle/zurich-api-reference/page/app-store/dev_portal/API_reference/GlideRecord/concept/c_GlideRecordAPI.html
+- GlideDateTime API  
+  https://www.servicenow.com/docs/bundle/zurich-api-reference/page/app-store/dev_portal/API_reference/GlideDateTime/concept/c_GlideDateTimeAPI.html