diff --git a/mps/code/amcss.c b/mps/code/amcss.c
index f4d956e4c61..d51756dc24e 100644
--- a/mps/code/amcss.c
+++ b/mps/code/amcss.c
@@ -46,26 +46,6 @@ static mps_addr_t exactRoots[exactRootsCOUNT];
 static mps_addr_t ambigRoots[ambigRootsCOUNT];
 
 
-/* alert -- synchronous alert of collection start/stop */
-
-static void alertfn(int alertcode, int whycode)
-{
-  switch(alertcode) {
-    case MPS_ALERT_COLLECTION_BEGIN: {
-      printf("\n^^^^^^ BEGIN (why: %d) ^^^^^^\n", whycode);
-      break;
-    }
-    case MPS_ALERT_COLLECTION_END: {
-      printf("vvvvvv END (why: %d)  vvvvvv\n", whycode);
-      break;
-    }
-    default: {
-      cdie(0, "unknown alertcode");
-      break;
-    }
-  }
-}
-
 /* report -- report statistics from any messages */
 
 static void report(mps_arena_t arena)
@@ -326,7 +306,6 @@ int main(int argc, char *argv[])
       "arena_create");
   mps_message_type_enable(arena, mps_message_type_gc());
   mps_message_type_enable(arena, mps_message_type_gc_start());
-  mps_alert_collection_set(arena, &alertfn);
   die(mps_arena_commit_limit_set(arena, testArenaSIZE), "set limit");
   die(mps_thread_reg(&thread, arena), "thread_reg");
   test(arena);
diff --git a/mps/code/arena.c b/mps/code/arena.c
index a2ef4da980f..1273502968d 100644
--- a/mps/code/arena.c
+++ b/mps/code/arena.c
@@ -143,8 +143,6 @@ Bool ArenaCheck(Arena arena)
 
   CHECKL(LocusCheck(arena));
   
-  /* nothing to check for alertCollection */
-
   return TRUE;
 }
 
@@ -186,8 +184,6 @@ Res ArenaInit(Arena arena, ArenaClass class)
 
   LocusInit(arena);
   
-  arena->alertCollection = 0;
-
   res = GlobalsInit(ArenaGlobals(arena));
   if (res != ResOK)
     goto failGlobalsInit;
diff --git a/mps/code/mpmst.h b/mps/code/mpmst.h
index 332d32084e1..d67d6a54ffd 100644
--- a/mps/code/mpmst.h
+++ b/mps/code/mpmst.h
@@ -648,9 +648,6 @@ typedef struct mps_arena_s {
   Bool isFinalPool;             /* indicator for finalPool */
   Pool finalPool;               /* either NULL or an MRG pool */
 
-  /* alert fields <code/trace.c> */
-  mps_alert_collection_fn_t alertCollection;  /* client alert fn or 0 */
-
   /* thread fields (<code/thread.c>) */
   RingStruct threadRing;        /* ring of attached threads */
   Serial threadSerial;          /* serial of next thread */
diff --git a/mps/code/mps.h b/mps/code/mps.h
index cc4397e7252..0c2cc9dbd53 100644
--- a/mps/code/mps.h
+++ b/mps/code/mps.h
@@ -560,24 +560,6 @@ extern mps_res_t mps_finalize(mps_arena_t, mps_addr_t *);
 extern mps_res_t mps_definalize(mps_arena_t, mps_addr_t *);
 
 
-/* Alert */
-
-/* Alert codes. */
-enum {
-  MPS_ALERT_COLLECTION_BEGIN,
-  MPS_ALERT_COLLECTION_END
-};
-typedef void (*mps_alert_collection_fn_t)(int, int);
-extern mps_res_t mps_alert_collection_set(mps_arena_t, 
-                                          mps_alert_collection_fn_t);
-/* The following _START and _STOP identifiers are obsolete and 
- * deprecated: use _BEGIN and _END instead. */
-enum {
-  MPS_ALERT_COLLECTION_START = MPS_ALERT_COLLECTION_BEGIN,
-  MPS_ALERT_COLLECTION_STOP = MPS_ALERT_COLLECTION_END
-};
-
-
 /* Telemetry */
 
 extern mps_word_t mps_telemetry_control(mps_word_t, mps_word_t);
diff --git a/mps/code/mpsi.c b/mps/code/mpsi.c
index 86855d5c606..435b4fbc0c6 100644
--- a/mps/code/mpsi.c
+++ b/mps/code/mpsi.c
@@ -1674,18 +1674,6 @@ const char *mps_message_gc_start_why(mps_arena_t arena,
 }
 
 
-/* Alert */
-
-mps_res_t mps_alert_collection_set(mps_arena_t arena, 
-                                   mps_alert_collection_fn_t fn)
-{
-  ArenaEnter(arena);
-  arena->alertCollection = fn;
-  ArenaLeave(arena);
-  return MPS_RES_OK;  
-}
-
-
 /* Telemetry */
 
 /* TODO: need to consider locking. See job003387, job003388. */
diff --git a/mps/code/traceanc.c b/mps/code/traceanc.c
index 24da7a92741..e4248580a19 100644
--- a/mps/code/traceanc.c
+++ b/mps/code/traceanc.c
@@ -247,10 +247,6 @@ void TracePostStartMessage(Trace trace)
 
   /* We have consumed the pre-allocated message */
   AVER(!arena->tsMessage[ti]);
-
-  if(arena->alertCollection) {
-    (*arena->alertCollection)(MPS_ALERT_COLLECTION_BEGIN, trace->why);
-  }
 }
 
 
@@ -418,10 +414,6 @@ void TracePostMessage(Trace trace)
   
   /* We have consumed the pre-allocated message */
   AVER(!arena->tMessage[ti]);
-
-  if(arena->alertCollection) {
-    (*arena->alertCollection)(MPS_ALERT_COLLECTION_END, trace->why);
-  }
 }