diff --git a/mesh/v1alpha1/config.pb.go b/mesh/v1alpha1/config.pb.go
index 97da173f19..9cd3136f5a 100644
--- a/mesh/v1alpha1/config.pb.go
+++ b/mesh/v1alpha1/config.pb.go
@@ -211,7 +211,7 @@ type MeshConfig struct {
 	PolicyCheckFailOpen bool `protobuf:"varint,25,opt,name=policy_check_fail_open,json=policyCheckFailOpen,proto3" json:"policy_check_fail_open,omitempty"`
 	// Enable session affinity for envoy mixer reports so that calls from a proxy will
 	// always target the same mixer instance.
-	ReportSessionAffinity bool `protobuf:"varint,31,opt,name=report_session_affinity,json=reportSessionAffinity,proto3" json:"report_session_affinity,omitempty"`
+	SidecarToTelemetrySessionAffinity bool `protobuf:"varint,31,opt,name=sidecar_to_telemetry_session_affinity,json=sidecarToTelemetrySessionAffinity,proto3" json:"sidecar_to_telemetry_session_affinity,omitempty"`
 	// Port on which Envoy should listen for incoming connections from
 	// other services.
 	ProxyListenPort int32 `protobuf:"varint,4,opt,name=proxy_listen_port,json=proxyListenPort,proto3" json:"proxy_listen_port,omitempty"`
@@ -331,9 +331,9 @@ func (m *MeshConfig) GetPolicyCheckFailOpen() bool {
 	return false
 }
 
-func (m *MeshConfig) GetReportSessionAffinity() bool {
+func (m *MeshConfig) GetSidecarToTelemetrySessionAffinity() bool {
 	if m != nil {
-		return m.ReportSessionAffinity
+		return m.SidecarToTelemetrySessionAffinity
 	}
 	return false
 }
@@ -867,12 +867,12 @@ func (m *MeshConfig) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i++
 	}
-	if m.ReportSessionAffinity {
+	if m.SidecarToTelemetrySessionAffinity {
 		dAtA[i] = 0xf8
 		i++
 		dAtA[i] = 0x1
 		i++
-		if m.ReportSessionAffinity {
+		if m.SidecarToTelemetrySessionAffinity {
 			dAtA[i] = 1
 		} else {
 			dAtA[i] = 0
@@ -1092,7 +1092,7 @@ func (m *MeshConfig) Size() (n int) {
 	if m.SdsUseK8SSaJwt {
 		n += 3
 	}
-	if m.ReportSessionAffinity {
+	if m.SidecarToTelemetrySessionAffinity {
 		n += 3
 	}
 	return n
@@ -1918,7 +1918,7 @@ func (m *MeshConfig) Unmarshal(dAtA []byte) error {
 			m.SdsUseK8SSaJwt = bool(v != 0)
 		case 31:
 			if wireType != 0 {
-				return fmt.Errorf("proto: wrong wireType = %d for field ReportSessionAffinity", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SidecarToTelemetrySessionAffinity", wireType)
 			}
 			var v int
 			for shift := uint(0); ; shift += 7 {
@@ -1935,7 +1935,7 @@ func (m *MeshConfig) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
-			m.ReportSessionAffinity = bool(v != 0)
+			m.SidecarToTelemetrySessionAffinity = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skipConfig(dAtA[iNdEx:])
@@ -2344,86 +2344,87 @@ var (
 func init() { proto.RegisterFile("mesh/v1alpha1/config.proto", fileDescriptorConfig) }
 
 var fileDescriptorConfig = []byte{
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 }
diff --git a/mesh/v1alpha1/config.proto b/mesh/v1alpha1/config.proto
index 31108bbccc..e5dab9194d 100644
--- a/mesh/v1alpha1/config.proto
+++ b/mesh/v1alpha1/config.proto
@@ -63,7 +63,7 @@ message MeshConfig {
 
   // Enable session affinity for envoy mixer reports so that calls from a proxy will
   // always target the same mixer instance.
-  bool report_session_affinity = 31;
+  bool sidecar_to_telemetry_session_affinity = 31;
 
   // Port on which Envoy should listen for incoming connections from
   // other services.
diff --git a/mesh/v1alpha1/istio.mesh.v1alpha1.pb.html b/mesh/v1alpha1/istio.mesh.v1alpha1.pb.html
index 7af7305dda..3dbdf46b1a 100644
--- a/mesh/v1alpha1/istio.mesh.v1alpha1.pb.html
+++ b/mesh/v1alpha1/istio.mesh.v1alpha1.pb.html
@@ -148,8 +148,8 @@ <h2 id="MeshConfig">MeshConfig</h2>
 
 </td>
 </tr>
-<tr id="MeshConfig-report_session_affinity">
-<td><code>reportSessionAffinity</code></td>
+<tr id="MeshConfig-sidecar_to_telemetry_session_affinity">
+<td><code>sidecarToTelemetrySessionAffinity</code></td>
 <td><code>bool</code></td>
 <td>
 <p>Enable session affinity for envoy mixer reports so that calls from a proxy will
diff --git a/proto.lock b/proto.lock
index 5dac18522c..62c8010adc 100644
--- a/proto.lock
+++ b/proto.lock
@@ -731,7 +731,7 @@
               },
               {
                 "id": 31,
-                "name": "report_session_affinity",
+                "name": "sidecar_to_telemetry_session_affinity",
                 "type": "bool"
               },
               {
diff --git a/python/istio_api/mesh/v1alpha1/config_pb2.py b/python/istio_api/mesh/v1alpha1/config_pb2.py
index 054c89805d..9567835eac 100644
--- a/python/istio_api/mesh/v1alpha1/config_pb2.py
+++ b/python/istio_api/mesh/v1alpha1/config_pb2.py
@@ -22,7 +22,7 @@
   name='mesh/v1alpha1/config.proto',
   package='istio.mesh.v1alpha1',
   syntax='proto3',
-  serialized_pb=_b('\n\x1amesh/v1alpha1/config.proto\x12\x13istio.mesh.v1alpha1\x1a\x1egoogle/protobuf/duration.proto\x1a\x19mesh/v1alpha1/proxy.proto\x1a*networking/v1alpha3/destination_rule.proto\"\xa4\x0e\n\nMeshConfig\x12\x1a\n\x12mixer_check_server\x18\x01 \x01(\t\x12\x1b\n\x13mixer_report_server\x18\x02 \x01(\t\x12\x1d\n\x15\x64isable_policy_checks\x18\x03 \x01(\x08\x12\x1e\n\x16policy_check_fail_open\x18\x19 \x01(\x08\x12\x1f\n\x17report_session_affinity\x18\x1f \x01(\x08\x12\x19\n\x11proxy_listen_port\x18\x04 \x01(\x05\x12\x17\n\x0fproxy_http_port\x18\x05 \x01(\x05\x12\x32\n\x0f\x63onnect_timeout\x18\x06 \x01(\x0b\x32\x19.google.protobuf.Duration\x12\x61\n\rtcp_keepalive\x18\x1c \x01(\x0b\x32J.istio.networking.v1alpha3.ConnectionPoolSettings.TCPSettings.TcpKeepalive\x12\x15\n\ringress_class\x18\x07 \x01(\t\x12\x17\n\x0fingress_service\x18\x08 \x01(\t\x12V\n\x17ingress_controller_mode\x18\t \x01(\x0e\x32\x35.istio.mesh.v1alpha1.MeshConfig.IngressControllerMode\x12\x43\n\x0b\x61uth_policy\x18\n \x01(\x0e\x32*.istio.mesh.v1alpha1.MeshConfig.AuthPolicyB\x02\x18\x01\x12\x38\n\x11rds_refresh_delay\x18\x0b \x01(\x0b\x32\x19.google.protobuf.DurationB\x02\x18\x01\x12\x16\n\x0e\x65nable_tracing\x18\x0c \x01(\x08\x12\x17\n\x0f\x61\x63\x63\x65ss_log_file\x18\r \x01(\t\x12\x19\n\x11\x61\x63\x63\x65ss_log_format\x18\x18 \x01(\t\x12N\n\x13\x61\x63\x63\x65ss_log_encoding\x18\x1b \x01(\x0e\x32\x31.istio.mesh.v1alpha1.MeshConfig.AccessLogEncoding\x12\x38\n\x0e\x64\x65\x66\x61ult_config\x18\x0e \x01(\x0b\x32 .istio.mesh.v1alpha1.ProxyConfig\x12\x19\n\rmixer_address\x18\x10 \x01(\tB\x02\x18\x01\x12V\n\x17outbound_traffic_policy\x18\x11 \x01(\x0b\x32\x35.istio.mesh.v1alpha1.MeshConfig.OutboundTrafficPolicy\x12\'\n\x1f\x65nable_client_side_policy_check\x18\x13 \x01(\x08\x12\x14\n\x0csds_uds_path\x18\x14 \x01(\t\x12\x38\n\x11sds_refresh_delay\x18\x15 \x01(\x0b\x32\x19.google.protobuf.DurationB\x02\x18\x01\x12\x39\n\x0e\x63onfig_sources\x18\x16 \x03(\x0b\x32!.istio.mesh.v1alpha1.ConfigSource\x12\x1e\n\x16\x65nable_sds_token_mount\x18\x17 \x01(\x08\x12\x1a\n\x12sds_use_k8s_sa_jwt\x18\x1e \x01(\x08\x12\x14\n\x0ctrust_domain\x18\x1a \x01(\t\x12\\\n\x1a\x64\x65\x66\x61ult_service_dependency\x18\x1d \x01(\x0b\x32\x38.istio.mesh.v1alpha1.MeshConfig.DefaultServiceDependency\x1a\xa9\x01\n\x15OutboundTrafficPolicy\x12H\n\x04mode\x18\x01 \x01(\x0e\x32:.istio.mesh.v1alpha1.MeshConfig.OutboundTrafficPolicy.Mode\"F\n\x04Mode\x12\x11\n\rREGISTRY_ONLY\x10\x00\x12\r\n\tALLOW_ANY\x10\x01\x12\x1c\n\x14VIRTUAL_SERVICE_ONLY\x10\x02\x1a\x02\x08\x01\x1a\xb9\x01\n\x18\x44\x65\x66\x61ultServiceDependency\x12R\n\x0bimport_mode\x18\x01 \x01(\x0e\x32=.istio.mesh.v1alpha1.MeshConfig.DefaultServiceDependency.Mode\x12\x19\n\x11import_namespaces\x18\x02 \x03(\t\".\n\x04Mode\x12\x12\n\x0e\x41LL_NAMESPACES\x10\x00\x12\x12\n\x0eSAME_NAMESPACE\x10\x01\"9\n\x15IngressControllerMode\x12\x07\n\x03OFF\x10\x00\x12\x0b\n\x07\x44\x45\x46\x41ULT\x10\x01\x12\n\n\x06STRICT\x10\x02\"&\n\nAuthPolicy\x12\x08\n\x04NONE\x10\x00\x12\x0e\n\nMUTUAL_TLS\x10\x01\"\'\n\x11\x41\x63\x63\x65ssLogEncoding\x12\x08\n\x04TEXT\x10\x00\x12\x08\n\x04JSON\x10\x01J\x04\x08\x0f\x10\x10J\x04\x08\x12\x10\x13\"]\n\x0c\x43onfigSource\x12\x0f\n\x07\x61\x64\x64ress\x18\x01 \x01(\t\x12<\n\x0ctls_settings\x18\x02 \x01(\x0b\x32&.istio.networking.v1alpha3.TLSSettingsB\x1cZ\x1aistio.io/api/mesh/v1alpha1b\x06proto3')
+  serialized_pb=_b('\n\x1amesh/v1alpha1/config.proto\x12\x13istio.mesh.v1alpha1\x1a\x1egoogle/protobuf/duration.proto\x1a\x19mesh/v1alpha1/proxy.proto\x1a*networking/v1alpha3/destination_rule.proto\"\xb2\x0e\n\nMeshConfig\x12\x1a\n\x12mixer_check_server\x18\x01 \x01(\t\x12\x1b\n\x13mixer_report_server\x18\x02 \x01(\t\x12\x1d\n\x15\x64isable_policy_checks\x18\x03 \x01(\x08\x12\x1e\n\x16policy_check_fail_open\x18\x19 \x01(\x08\x12-\n%sidecar_to_telemetry_session_affinity\x18\x1f \x01(\x08\x12\x19\n\x11proxy_listen_port\x18\x04 \x01(\x05\x12\x17\n\x0fproxy_http_port\x18\x05 \x01(\x05\x12\x32\n\x0f\x63onnect_timeout\x18\x06 \x01(\x0b\x32\x19.google.protobuf.Duration\x12\x61\n\rtcp_keepalive\x18\x1c \x01(\x0b\x32J.istio.networking.v1alpha3.ConnectionPoolSettings.TCPSettings.TcpKeepalive\x12\x15\n\ringress_class\x18\x07 \x01(\t\x12\x17\n\x0fingress_service\x18\x08 \x01(\t\x12V\n\x17ingress_controller_mode\x18\t \x01(\x0e\x32\x35.istio.mesh.v1alpha1.MeshConfig.IngressControllerMode\x12\x43\n\x0b\x61uth_policy\x18\n \x01(\x0e\x32*.istio.mesh.v1alpha1.MeshConfig.AuthPolicyB\x02\x18\x01\x12\x38\n\x11rds_refresh_delay\x18\x0b \x01(\x0b\x32\x19.google.protobuf.DurationB\x02\x18\x01\x12\x16\n\x0e\x65nable_tracing\x18\x0c \x01(\x08\x12\x17\n\x0f\x61\x63\x63\x65ss_log_file\x18\r \x01(\t\x12\x19\n\x11\x61\x63\x63\x65ss_log_format\x18\x18 \x01(\t\x12N\n\x13\x61\x63\x63\x65ss_log_encoding\x18\x1b \x01(\x0e\x32\x31.istio.mesh.v1alpha1.MeshConfig.AccessLogEncoding\x12\x38\n\x0e\x64\x65\x66\x61ult_config\x18\x0e \x01(\x0b\x32 .istio.mesh.v1alpha1.ProxyConfig\x12\x19\n\rmixer_address\x18\x10 \x01(\tB\x02\x18\x01\x12V\n\x17outbound_traffic_policy\x18\x11 \x01(\x0b\x32\x35.istio.mesh.v1alpha1.MeshConfig.OutboundTrafficPolicy\x12\'\n\x1f\x65nable_client_side_policy_check\x18\x13 \x01(\x08\x12\x14\n\x0csds_uds_path\x18\x14 \x01(\t\x12\x38\n\x11sds_refresh_delay\x18\x15 \x01(\x0b\x32\x19.google.protobuf.DurationB\x02\x18\x01\x12\x39\n\x0e\x63onfig_sources\x18\x16 \x03(\x0b\x32!.istio.mesh.v1alpha1.ConfigSource\x12\x1e\n\x16\x65nable_sds_token_mount\x18\x17 \x01(\x08\x12\x1a\n\x12sds_use_k8s_sa_jwt\x18\x1e \x01(\x08\x12\x14\n\x0ctrust_domain\x18\x1a \x01(\t\x12\\\n\x1a\x64\x65\x66\x61ult_service_dependency\x18\x1d \x01(\x0b\x32\x38.istio.mesh.v1alpha1.MeshConfig.DefaultServiceDependency\x1a\xa9\x01\n\x15OutboundTrafficPolicy\x12H\n\x04mode\x18\x01 \x01(\x0e\x32:.istio.mesh.v1alpha1.MeshConfig.OutboundTrafficPolicy.Mode\"F\n\x04Mode\x12\x11\n\rREGISTRY_ONLY\x10\x00\x12\r\n\tALLOW_ANY\x10\x01\x12\x1c\n\x14VIRTUAL_SERVICE_ONLY\x10\x02\x1a\x02\x08\x01\x1a\xb9\x01\n\x18\x44\x65\x66\x61ultServiceDependency\x12R\n\x0bimport_mode\x18\x01 \x01(\x0e\x32=.istio.mesh.v1alpha1.MeshConfig.DefaultServiceDependency.Mode\x12\x19\n\x11import_namespaces\x18\x02 \x03(\t\".\n\x04Mode\x12\x12\n\x0e\x41LL_NAMESPACES\x10\x00\x12\x12\n\x0eSAME_NAMESPACE\x10\x01\"9\n\x15IngressControllerMode\x12\x07\n\x03OFF\x10\x00\x12\x0b\n\x07\x44\x45\x46\x41ULT\x10\x01\x12\n\n\x06STRICT\x10\x02\"&\n\nAuthPolicy\x12\x08\n\x04NONE\x10\x00\x12\x0e\n\nMUTUAL_TLS\x10\x01\"\'\n\x11\x41\x63\x63\x65ssLogEncoding\x12\x08\n\x04TEXT\x10\x00\x12\x08\n\x04JSON\x10\x01J\x04\x08\x0f\x10\x10J\x04\x08\x12\x10\x13\"]\n\x0c\x43onfigSource\x12\x0f\n\x07\x61\x64\x64ress\x18\x01 \x01(\t\x12<\n\x0ctls_settings\x18\x02 \x01(\x0b\x32&.istio.networking.v1alpha3.TLSSettingsB\x1cZ\x1aistio.io/api/mesh/v1alpha1b\x06proto3')
   ,
   dependencies=[google_dot_protobuf_dot_duration__pb2.DESCRIPTOR,mesh_dot_v1alpha1_dot_proxy__pb2.DESCRIPTOR,networking_dot_v1alpha3_dot_destination__rule__pb2.DESCRIPTOR,])
 
@@ -49,8 +49,8 @@
   ],
   containing_type=None,
   options=None,
-  serialized_start=1573,
-  serialized_end=1643,
+  serialized_start=1587,
+  serialized_end=1657,
 )
 _sym_db.RegisterEnumDescriptor(_MESHCONFIG_OUTBOUNDTRAFFICPOLICY_MODE)
 
@@ -71,8 +71,8 @@
   ],
   containing_type=None,
   options=None,
-  serialized_start=1785,
-  serialized_end=1831,
+  serialized_start=1799,
+  serialized_end=1845,
 )
 _sym_db.RegisterEnumDescriptor(_MESHCONFIG_DEFAULTSERVICEDEPENDENCY_MODE)
 
@@ -97,8 +97,8 @@
   ],
   containing_type=None,
   options=None,
-  serialized_start=1833,
-  serialized_end=1890,
+  serialized_start=1847,
+  serialized_end=1904,
 )
 _sym_db.RegisterEnumDescriptor(_MESHCONFIG_INGRESSCONTROLLERMODE)
 
@@ -119,8 +119,8 @@
   ],
   containing_type=None,
   options=None,
-  serialized_start=1892,
-  serialized_end=1930,
+  serialized_start=1906,
+  serialized_end=1944,
 )
 _sym_db.RegisterEnumDescriptor(_MESHCONFIG_AUTHPOLICY)
 
@@ -141,8 +141,8 @@
   ],
   containing_type=None,
   options=None,
-  serialized_start=1932,
-  serialized_end=1971,
+  serialized_start=1946,
+  serialized_end=1985,
 )
 _sym_db.RegisterEnumDescriptor(_MESHCONFIG_ACCESSLOGENCODING)
 
@@ -174,8 +174,8 @@
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1474,
-  serialized_end=1643,
+  serialized_start=1488,
+  serialized_end=1657,
 )
 
 _MESHCONFIG_DEFAULTSERVICEDEPENDENCY = _descriptor.Descriptor(
@@ -212,8 +212,8 @@
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1646,
-  serialized_end=1831,
+  serialized_start=1660,
+  serialized_end=1845,
 )
 
 _MESHCONFIG = _descriptor.Descriptor(
@@ -252,7 +252,7 @@
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
-      name='report_session_affinity', full_name='istio.mesh.v1alpha1.MeshConfig.report_session_affinity', index=4,
+      name='sidecar_to_telemetry_session_affinity', full_name='istio.mesh.v1alpha1.MeshConfig.sidecar_to_telemetry_session_affinity', index=4,
       number=31, type=8, cpp_type=7, label=1,
       has_default_value=False, default_value=False,
       message_type=None, enum_type=None, containing_type=None,
@@ -442,7 +442,7 @@
   oneofs=[
   ],
   serialized_start=155,
-  serialized_end=1983,
+  serialized_end=1997,
 )
 
 
@@ -479,8 +479,8 @@
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1985,
-  serialized_end=2078,
+  serialized_start=1999,
+  serialized_end=2092,
 )
 
 _MESHCONFIG_OUTBOUNDTRAFFICPOLICY.fields_by_name['mode'].enum_type = _MESHCONFIG_OUTBOUNDTRAFFICPOLICY_MODE