diff --git a/logging/google/cloud/logging_v2/gapic/config_service_v2_client.py b/logging/google/cloud/logging_v2/gapic/config_service_v2_client.py
index a24f9c544c77..a2bb6dbbc587 100644
--- a/logging/google/cloud/logging_v2/gapic/config_service_v2_client.py
+++ b/logging/google/cloud/logging_v2/gapic/config_service_v2_client.py
@@ -23,6 +23,7 @@
 import google.api_core.gapic_v1.client_info
 import google.api_core.gapic_v1.config
 import google.api_core.gapic_v1.method
+import google.api_core.gapic_v1.routing_header
 import google.api_core.grpc_helpers
 import google.api_core.page_iterator
 import google.api_core.path_template
@@ -280,6 +281,19 @@ def list_sinks(
         request = logging_config_pb2.ListSinksRequest(
             parent=parent, page_size=page_size
         )
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("parent", parent)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         iterator = google.api_core.page_iterator.GRPCIterator(
             client=None,
             method=functools.partial(
@@ -356,6 +370,19 @@ def get_sink(
             )
 
         request = logging_config_pb2.GetSinkRequest(sink_name=sink_name)
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("sink_name", sink_name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         return self._inner_api_calls["get_sink"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -448,6 +475,19 @@ def create_sink(
         request = logging_config_pb2.CreateSinkRequest(
             parent=parent, sink=sink, unique_writer_identity=unique_writer_identity
         )
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("parent", parent)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         return self._inner_api_calls["create_sink"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -561,6 +601,19 @@ def update_sink(
             unique_writer_identity=unique_writer_identity,
             update_mask=update_mask,
         )
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("sink_name", sink_name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         return self._inner_api_calls["update_sink"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -625,6 +678,19 @@ def delete_sink(
             )
 
         request = logging_config_pb2.DeleteSinkRequest(sink_name=sink_name)
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("sink_name", sink_name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         self._inner_api_calls["delete_sink"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -711,6 +777,19 @@ def list_exclusions(
         request = logging_config_pb2.ListExclusionsRequest(
             parent=parent, page_size=page_size
         )
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("parent", parent)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         iterator = google.api_core.page_iterator.GRPCIterator(
             client=None,
             method=functools.partial(
@@ -787,6 +866,19 @@ def get_exclusion(
             )
 
         request = logging_config_pb2.GetExclusionRequest(name=name)
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("name", name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         return self._inner_api_calls["get_exclusion"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -866,6 +958,19 @@ def create_exclusion(
         request = logging_config_pb2.CreateExclusionRequest(
             parent=parent, exclusion=exclusion
         )
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("parent", parent)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         return self._inner_api_calls["create_exclusion"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -956,6 +1061,19 @@ def update_exclusion(
         request = logging_config_pb2.UpdateExclusionRequest(
             name=name, exclusion=exclusion, update_mask=update_mask
         )
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("name", name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         return self._inner_api_calls["update_exclusion"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -1018,6 +1136,19 @@ def delete_exclusion(
             )
 
         request = logging_config_pb2.DeleteExclusionRequest(name=name)
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("name", name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         self._inner_api_calls["delete_exclusion"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
diff --git a/logging/google/cloud/logging_v2/gapic/logging_service_v2_client.py b/logging/google/cloud/logging_v2/gapic/logging_service_v2_client.py
index 1add4e7046c8..1f04984b82d7 100644
--- a/logging/google/cloud/logging_v2/gapic/logging_service_v2_client.py
+++ b/logging/google/cloud/logging_v2/gapic/logging_service_v2_client.py
@@ -23,6 +23,7 @@
 import google.api_core.gapic_v1.client_info
 import google.api_core.gapic_v1.config
 import google.api_core.gapic_v1.method
+import google.api_core.gapic_v1.routing_header
 import google.api_core.grpc_helpers
 import google.api_core.page_iterator
 import google.api_core.path_template
@@ -247,6 +248,19 @@ def delete_log(
             )
 
         request = logging_pb2.DeleteLogRequest(log_name=log_name)
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("log_name", log_name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         self._inner_api_calls["delete_log"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -700,6 +714,19 @@ def list_logs(
             )
 
         request = logging_pb2.ListLogsRequest(parent=parent, page_size=page_size)
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("parent", parent)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         iterator = google.api_core.page_iterator.GRPCIterator(
             client=None,
             method=functools.partial(
diff --git a/logging/google/cloud/logging_v2/gapic/metrics_service_v2_client.py b/logging/google/cloud/logging_v2/gapic/metrics_service_v2_client.py
index faca01a595fe..4a987ed47d2d 100644
--- a/logging/google/cloud/logging_v2/gapic/metrics_service_v2_client.py
+++ b/logging/google/cloud/logging_v2/gapic/metrics_service_v2_client.py
@@ -23,6 +23,7 @@
 import google.api_core.gapic_v1.client_info
 import google.api_core.gapic_v1.config
 import google.api_core.gapic_v1.method
+import google.api_core.gapic_v1.routing_header
 import google.api_core.grpc_helpers
 import google.api_core.page_iterator
 import google.api_core.path_template
@@ -267,6 +268,19 @@ def list_log_metrics(
         request = logging_metrics_pb2.ListLogMetricsRequest(
             parent=parent, page_size=page_size
         )
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("parent", parent)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         iterator = google.api_core.page_iterator.GRPCIterator(
             client=None,
             method=functools.partial(
@@ -338,6 +352,19 @@ def get_log_metric(
             )
 
         request = logging_metrics_pb2.GetLogMetricRequest(metric_name=metric_name)
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("metric_name", metric_name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         return self._inner_api_calls["get_log_metric"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -411,6 +438,19 @@ def create_log_metric(
         request = logging_metrics_pb2.CreateLogMetricRequest(
             parent=parent, metric=metric
         )
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("parent", parent)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         return self._inner_api_calls["create_log_metric"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -485,6 +525,19 @@ def update_log_metric(
         request = logging_metrics_pb2.UpdateLogMetricRequest(
             metric_name=metric_name, metric=metric
         )
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("metric_name", metric_name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         return self._inner_api_calls["update_log_metric"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
@@ -542,6 +595,19 @@ def delete_log_metric(
             )
 
         request = logging_metrics_pb2.DeleteLogMetricRequest(metric_name=metric_name)
+        if metadata is None:
+            metadata = []
+        metadata = list(metadata)
+        try:
+            routing_header = [("metric_name", metric_name)]
+        except AttributeError:
+            pass
+        else:
+            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
+                routing_header
+            )
+            metadata.append(routing_metadata)
+
         self._inner_api_calls["delete_log_metric"](
             request, retry=retry, timeout=timeout, metadata=metadata
         )
diff --git a/logging/synth.metadata b/logging/synth.metadata
index d46efbb6bebe..9680da28f7c2 100644
--- a/logging/synth.metadata
+++ b/logging/synth.metadata
@@ -1,26 +1,26 @@
 {
-  "updateTime": "2019-02-26T13:20:43.903128Z",
+  "updateTime": "2019-03-28T12:19:01.156618Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.14",
-        "dockerImage": "googleapis/artman@sha256:f3d61ae45abaeefb6be5f228cda22732c2f1b00fb687c79c4bd4f2c42bb1e1a7"
+        "version": "0.16.20",
+        "dockerImage": "googleapis/artman@sha256:e3c054a2fb85a12481c722af616c7fb6f1d02d862248385eecbec3e4240ebd1e"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "29f098cb03a9983cc9cb15993de5da64419046f2",
-        "internalRef": "235621085"
+        "sha": "6a84b3267b0a95e922608b9891219075047eee29",
+        "internalRef": "240640999"
       }
     },
     {
       "template": {
         "name": "python_library",
         "origin": "synthtool.gcp",
-        "version": "2019.1.16"
+        "version": "2019.2.26"
       }
     }
   ],