Revert "temp: Add temporary monitoring for large memcache keys (#36034)…

…" (#36040)

This reverts commit fb56042. We have the data we need.

common/djangoapps/util/memcache.py

@@ -9,7 +9,6 @@
 
 from django.conf import settings
 from django.utils.encoding import smart_str
-from edx_django_utils.monitoring.utils import increment
 
 
 def fasthash(string):
@@ -49,18 +48,9 @@ def safe_key(key, key_prefix, version):
     # Attempt to combine the prefix, version, and key
     combined = ":".join([key_prefix, version, key])
 
-    # Temporary: Add observability to large-key hashing to help us
-    # understand the safety of a cutover from md4 to blake2b hashing.
-    # See https://github.com/edx/edx-arch-experiments/issues/872
-    increment('memcache.safe_key.called')
-
     # If the total length is too long for memcache, hash it
     if len(combined) > 250:
         combined = fasthash(combined)
-        # Temporary: See
-        # https://github.com/edx/edx-arch-experiments/issues/872 and
-        # previous comment.
-        increment('memcache.safe_key.hash_large')
 
     # Return the result
     return combined