[call v3] add experiment (#35784)

Closes #35784

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/35784 from markdroth:call_v3_experiment 2cabe8cca2
PiperOrigin-RevId: 603435692

bazel/experiments.bzl

@@ -18,6 +18,7 @@
 
 EXPERIMENT_ENABLES = {
     "call_status_override_on_cancellation": "call_status_override_on_cancellation",
+    "call_v3": "call_v3",
     "canary_client_privacy": "canary_client_privacy",
     "client_idleness": "client_idleness",
     "client_privacy": "client_privacy",

src/core/lib/experiments/experiments.cc

@@ -29,6 +29,8 @@ const char* const description_call_status_override_on_cancellation =
     "with cancellation.";
 const char* const additional_constraints_call_status_override_on_cancellation =
     "{}";
+const char* const description_call_v3 = "Promise-based call version 3.";
+const char* const additional_constraints_call_v3 = "{}";
 const char* const description_canary_client_privacy =
     "If set, canary client privacy";
 const char* const additional_constraints_canary_client_privacy = "{}";
@@ -191,6 +193,8 @@ const ExperimentMetadata g_experiment_metadata[] = {
      description_call_status_override_on_cancellation,
      additional_constraints_call_status_override_on_cancellation, nullptr, 0,
      kDefaultForDebugOnly, true},
+    {"call_v3", description_call_v3, additional_constraints_call_v3, nullptr, 0,
+     false, true},
     {"canary_client_privacy", description_canary_client_privacy,
      additional_constraints_canary_client_privacy, nullptr, 0, false, false},
     {"client_idleness", description_client_idleness,
@@ -293,6 +297,8 @@ const char* const description_call_status_override_on_cancellation =
     "with cancellation.";
 const char* const additional_constraints_call_status_override_on_cancellation =
     "{}";
+const char* const description_call_v3 = "Promise-based call version 3.";
+const char* const additional_constraints_call_v3 = "{}";
 const char* const description_canary_client_privacy =
     "If set, canary client privacy";
 const char* const additional_constraints_canary_client_privacy = "{}";
@@ -455,6 +461,8 @@ const ExperimentMetadata g_experiment_metadata[] = {
      description_call_status_override_on_cancellation,
      additional_constraints_call_status_override_on_cancellation, nullptr, 0,
      kDefaultForDebugOnly, true},
+    {"call_v3", description_call_v3, additional_constraints_call_v3, nullptr, 0,
+     false, true},
     {"canary_client_privacy", description_canary_client_privacy,
      additional_constraints_canary_client_privacy, nullptr, 0, false, false},
     {"client_idleness", description_client_idleness,
@@ -557,6 +565,8 @@ const char* const description_call_status_override_on_cancellation =
     "with cancellation.";
 const char* const additional_constraints_call_status_override_on_cancellation =
     "{}";
+const char* const description_call_v3 = "Promise-based call version 3.";
+const char* const additional_constraints_call_v3 = "{}";
 const char* const description_canary_client_privacy =
     "If set, canary client privacy";
 const char* const additional_constraints_canary_client_privacy = "{}";
@@ -719,6 +729,8 @@ const ExperimentMetadata g_experiment_metadata[] = {
      description_call_status_override_on_cancellation,
      additional_constraints_call_status_override_on_cancellation, nullptr, 0,
      kDefaultForDebugOnly, true},
+    {"call_v3", description_call_v3, additional_constraints_call_v3, nullptr, 0,
+     false, true},
     {"canary_client_privacy", description_canary_client_privacy,
      additional_constraints_canary_client_privacy, nullptr, 0, false, false},
     {"client_idleness", description_client_idleness,

src/core/lib/experiments/experiments.h

@@ -67,6 +67,7 @@ inline bool IsCallStatusOverrideOnCancellationEnabled() {
   return true;
 #endif
 }
+inline bool IsCallV3Enabled() { return false; }
 inline bool IsCanaryClientPrivacyEnabled() { return false; }
 #define GRPC_EXPERIMENT_IS_INCLUDED_CLIENT_IDLENESS
 inline bool IsClientIdlenessEnabled() { return true; }
@@ -128,6 +129,7 @@ inline bool IsCallStatusOverrideOnCancellationEnabled() {
   return true;
 #endif
 }
+inline bool IsCallV3Enabled() { return false; }
 inline bool IsCanaryClientPrivacyEnabled() { return false; }
 #define GRPC_EXPERIMENT_IS_INCLUDED_CLIENT_IDLENESS
 inline bool IsClientIdlenessEnabled() { return true; }
@@ -190,6 +192,7 @@ inline bool IsCallStatusOverrideOnCancellationEnabled() {
   return true;
 #endif
 }
+inline bool IsCallV3Enabled() { return false; }
 inline bool IsCanaryClientPrivacyEnabled() { return false; }
 #define GRPC_EXPERIMENT_IS_INCLUDED_CLIENT_IDLENESS
 inline bool IsClientIdlenessEnabled() { return true; }
@@ -246,6 +249,7 @@ inline bool IsWrrDelegateToPickFirstEnabled() { return true; }
 #else
 enum ExperimentIds {
   kExperimentIdCallStatusOverrideOnCancellation,
+  kExperimentIdCallV3,
   kExperimentIdCanaryClientPrivacy,
   kExperimentIdClientIdleness,
   kExperimentIdClientPrivacy,
@@ -290,6 +294,10 @@ enum ExperimentIds {
 inline bool IsCallStatusOverrideOnCancellationEnabled() {
   return IsExperimentEnabled(kExperimentIdCallStatusOverrideOnCancellation);
 }
+#define GRPC_EXPERIMENT_IS_INCLUDED_CALL_V3
+inline bool IsCallV3Enabled() {
+  return IsExperimentEnabled(kExperimentIdCallV3);
+}
 #define GRPC_EXPERIMENT_IS_INCLUDED_CANARY_CLIENT_PRIVACY
 inline bool IsCanaryClientPrivacyEnabled() {
   return IsExperimentEnabled(kExperimentIdCanaryClientPrivacy);

src/core/lib/experiments/experiments.yaml

@@ -47,6 +47,11 @@
   expiry: 2024/04/01
   owner: vigneshbabu@google.com
   test_tags: []
+- name: call_v3
+  description: Promise-based call version 3.
+  expiry: 2024/06/01
+  owner: ctiller@google.com
+  test_tags: []
 - name: canary_client_privacy
   description:
     If set, canary client privacy

src/core/lib/experiments/rollouts.yaml

@@ -42,6 +42,8 @@
 
 - name: call_status_override_on_cancellation
   default: debug
+- name: call_v3
+  default: false
 - name: canary_client_privacy
   default: false
 - name: client_idleness