Anchor sp_HumanEvents cleanup LIKE to its own session names

The @cleanup = 1 path built a DROP EVENT SESSION list for every row
matching N'%HumanEvents_%'. Two problems:

  1. Leading % — unanchored, so N'MyHumanEvents_AppSession' (a user's
     own XE session whose name happens to include "HumanEvents")
     matched and got dropped.
  2. Unescaped _ — LIKE treats _ as a single-character wildcard, so
     N'HumanEventsMonitor' (no literal underscore at all) matched via
     the trailing % plus the _ wildcard absorbing any one character.

Changed to two anchored patterns with the underscore escaped via a
bracket class, matching exactly what sp_HumanEvents creates:

    LIKE N'HumanEvents[_]%'
  OR LIKE N'keeper[_]HumanEvents[_]%'

Verified against a synthetic session-name set:
  OLD matched 4 of 5 names (3 legitimate + HumanEventsMonitor +
    MyHumanEvents_AppSession — 2 collateral-damage matches)
  NEW matched exactly the 2 sp_HumanEvents sessions
    (HumanEvents_waits_abc123, keeper_HumanEvents_blocking)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: erikdarlingdata

sp_HumanEvents/sp_HumanEvents.sql

@@ -4831,7 +4831,22 @@ BEGIN
 
     SET @executer = QUOTENAME(@output_database_name) + N'.sys.sp_executesql ';
 
-    /*Clean up sessions*/
+    /*
+    Clean up sessions. Match only what sp_HumanEvents itself creates:
+      HumanEvents_<event_type>_<guid>  (one-shot, @keep_alive = 0)
+      keeper_HumanEvents_<event_type>  (@keep_alive = 1)
+
+    Previous pattern N'%HumanEvents_%' had two issues:
+      - unanchored leading % — a user session named "MyHumanEventsFoo"
+        would match and get dropped.
+      - unescaped _ — LIKE treats _ as a single-char wildcard, so
+        "HumanEventsMonitor" (no literal underscore) would match via the
+        trailing % + the _ wildcard eating any one character.
+
+    Anchored to the prefix and escaped the literal underscore with a
+    bracket class so an operator using HumanEvents-adjacent names for
+    their own XE sessions isn't collateral damage.
+    */
     IF @azure = 0
     BEGIN
         SELECT
@@ -4843,7 +4858,8 @@ BEGIN
         FROM sys.server_event_sessions AS ses
         LEFT JOIN sys.dm_xe_sessions AS dxs
           ON dxs.name = ses.name
-        WHERE ses.name LIKE N'%HumanEvents_%';
+        WHERE ses.name LIKE N'HumanEvents[_]%'
+        OR    ses.name LIKE N'keeper[_]HumanEvents[_]%';
     END;
     ELSE
     BEGIN
@@ -4856,7 +4872,8 @@ BEGIN
         FROM sys.database_event_sessions AS ses
         LEFT JOIN sys.dm_xe_database_sessions AS dxs
           ON dxs.name = ses.name
-        WHERE ses.name LIKE N'%HumanEvents_%';
+        WHERE ses.name LIKE N'HumanEvents[_]%'
+        OR    ses.name LIKE N'keeper[_]HumanEvents[_]%';
     END;
 
     EXECUTE sys.sp_executesql