[experiments] Fix experiment expiry and avoid failing BUILDS on expired experiments. (#33325)

src/core/lib/experiments/experiments.yaml

@@ -39,12 +39,12 @@
     TCP would not indicate completion of a read operation until a specified
     number of bytes have been read over the socket.
     Buffers are also allocated according to estimated RPC sizes.
-  expiry: 2023/06/01
+  expiry: 2023/08/01
   owner: vigneshbabu@google.com
   test_tags: ["endpoint_test", "flow_control_test"]
 - name: tcp_rcv_lowat
   description: Use SO_RCVLOWAT to avoid wakeups on the read path.
-  expiry: 2023/06/01
+  expiry: 2023/08/01
   owner: vigneshbabu@google.com
   test_tags: ["endpoint_test", "flow_control_test"]
 - name: peer_state_based_framing
@@ -52,7 +52,7 @@
     If set, the max sizes of frames sent to lower layers is controlled based
     on the peer's memory pressure which is reflected in its max http2 frame
     size.
-  expiry: 2023/06/01
+  expiry: 2023/08/01
   owner: vigneshbabu@google.com
   test_tags: ["flow_control_test"]
 - name: memory_pressure_controller

tools/codegen/core/experiments_compiler.py

@@ -160,14 +160,12 @@ class ExperimentDefinition(object):
         two_quarters_from_now = today + datetime.timedelta(days=180)
         expiry = datetime.datetime.strptime(self._expiry, '%Y/%m/%d').date()
         if expiry < today:
-            print("ERROR: experiment %s expired on %s" %
+            print("WARNING: experiment %s expired on %s" %
                   (self._name, self._expiry))
-            self._error = True
         if expiry > two_quarters_from_now:
-            print("ERROR: experiment %s expires far in the future on %s" %
+            print("WARNING: experiment %s expires far in the future on %s" %
                   (self._name, self._expiry))
             print("expiry should be no more than two quarters from now")
-            self._error = True
         return not self._error
 
     def AddRolloutSpecification(self, allowed_defaults, rollout_attributes):