diff --git a/WORKSPACE b/WORKSPACE
index 4f90f06d88114b83625db359951e289e1ec8c53e..5d163f78e8172eef748ca4efa8b83c51c469b89f 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -33,26 +33,44 @@ bind(
     actual = "@submodule_gtest//:gtest",
 )
 
+bind(
+    name = "gflags",
+    actual = "@com_github_gflags_gflags//:gflags",
+)
+
 new_local_repository(
     name = "submodule_boringssl",
-    path = "third_party/boringssl-with-bazel",
     build_file = "third_party/boringssl-with-bazel/BUILD",
+    path = "third_party/boringssl-with-bazel",
 )
 
 new_local_repository(
     name = "submodule_zlib",
-    path = "third_party/zlib",
     build_file = "third_party/zlib.BUILD",
+    path = "third_party/zlib",
 )
 
 new_local_repository(
     name = "submodule_protobuf",
-    path = "third_party/protobuf",
     build_file = "third_party/protobuf/BUILD",
+    path = "third_party/protobuf",
 )
 
 new_local_repository(
     name = "submodule_gtest",
-    path = "third_party/googletest",
     build_file = "third_party/gtest.BUILD",
+    path = "third_party/googletest",
+)
+
+local_repository(
+    name = "com_github_gflags_gflags",
+    path = "third_party/gflags",
+)
+# used for tools/grpcz/grpcz_client
+git_repository(
+    name   = "mongoose_repo",
+    commit = "21b9ddd490783e3afaa0fa9b45d6c1133eb922dc",
+    remote = "https://github.com/makdharma/mongoose.git"
 )
+
+
diff --git a/tools/grpcz/BUILD b/tools/grpcz/BUILD
new file mode 100644
index 0000000000000000000000000000000000000000..34bd072d004dca9919d328ad0a2af29a6672df35
--- /dev/null
+++ b/tools/grpcz/BUILD
@@ -0,0 +1,73 @@
+# Copyright 2017, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+licenses(["notice"])  # 3-clause BSD
+
+package(default_visibility = ["//visibility:public"])
+
+load("//:bazel/generate_cc.bzl", "generate_cc")
+
+proto_library (
+    name = "monitoring_proto_local_copy",
+    srcs = [
+        # TODO (erikgribkoff) : remove the local copies of these protos
+        "monitoring.proto",
+        "empty.proto",
+        "any.proto",
+        "census.proto",
+    ],
+)
+
+generate_cc(
+    name = "monitoring_codegen",
+    srcs = [":monitoring_proto_local_copy"],
+)
+
+generate_cc(
+    name = "monitoring_grpc_codegen",
+    srcs = [":monitoring_proto_local_copy"],
+    plugin = "//:grpc_cpp_plugin",
+)
+
+cc_library(
+    name = "proto_lib",
+    srcs = [":monitoring_codegen", ":monitoring_grpc_codegen"],
+    hdrs = [":monitoring_codegen", ":monitoring_grpc_codegen"],
+    deps = ["//:grpc++", "//:grpc++_codegen_proto", "//external:protobuf"],
+)
+
+cc_binary(
+    name = "grpcz_client",
+    srcs = ["grpcz_client.cc",],
+    deps = [
+        "proto_lib",
+        "//external:gflags",
+        "@mongoose_repo//:mongoose_lib",
+    ],
+)
diff --git a/tools/grpcz/any.proto b/tools/grpcz/any.proto
new file mode 100644
index 0000000000000000000000000000000000000000..a224a2b596e29c26da8b8631d344cc729e73ddec
--- /dev/null
+++ b/tools/grpcz/any.proto
@@ -0,0 +1,139 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+//package google.protobuf;
+
+option csharp_namespace = "Google.Protobuf.WellKnownTypes";
+option go_package = "github.com/golang/protobuf/ptypes/any";
+option java_package = "com.google.protobuf";
+option java_outer_classname = "AnyProto";
+option java_multiple_files = true;
+option objc_class_prefix = "GPB";
+
+// `Any` contains an arbitrary serialized protocol buffer message along with a
+// URL that describes the type of the serialized message.
+//
+// Protobuf library provides support to pack/unpack Any values in the form
+// of utility functions or additional generated methods of the Any type.
+//
+// Example 1: Pack and unpack a message in C++.
+//
+//     Foo foo = ...;
+//     Any any;
+//     any.PackFrom(foo);
+//     ...
+//     if (any.UnpackTo(&foo)) {
+//       ...
+//     }
+//
+// Example 2: Pack and unpack a message in Java.
+//
+//     Foo foo = ...;
+//     Any any = Any.pack(foo);
+//     ...
+//     if (any.is(Foo.class)) {
+//       foo = any.unpack(Foo.class);
+//     }
+//
+//  Example 3: Pack and unpack a message in Python.
+//
+//     foo = Foo(...)
+//     any = Any()
+//     any.Pack(foo)
+//     ...
+//     if any.Is(Foo.DESCRIPTOR):
+//       any.Unpack(foo)
+//       ...
+//
+// The pack methods provided by protobuf library will by default use
+// 'type.googleapis.com/full.type.name' as the type URL and the unpack
+// methods only use the fully qualified type name after the last '/'
+// in the type URL, for example "foo.bar.com/x/y.z" will yield type
+// name "y.z".
+//
+//
+// JSON
+// ====
+// The JSON representation of an `Any` value uses the regular
+// representation of the deserialized, embedded message, with an
+// additional field `@type` which contains the type URL. Example:
+//
+//     package google.profile;
+//     message Person {
+//       string first_name = 1;
+//       string last_name = 2;
+//     }
+//
+//     {
+//       "@type": "type.googleapis.com/google.profile.Person",
+//       "firstName": <string>,
+//       "lastName": <string>
+//     }
+//
+// If the embedded message type is well-known and has a custom JSON
+// representation, that representation will be embedded adding a field
+// `value` which holds the custom JSON in addition to the `@type`
+// field. Example (for message [google.protobuf.Duration][]):
+//
+//     {
+//       "@type": "type.googleapis.com/google.protobuf.Duration",
+//       "value": "1.212s"
+//     }
+//
+message Any {
+  // A URL/resource name whose content describes the type of the
+  // serialized protocol buffer message.
+  //
+  // For URLs which use the scheme `http`, `https`, or no scheme, the
+  // following restrictions and interpretations apply:
+  //
+  // * If no scheme is provided, `https` is assumed.
+  // * The last segment of the URL's path must represent the fully
+  //   qualified name of the type (as in `path/google.protobuf.Duration`).
+  //   The name should be in a canonical form (e.g., leading "." is
+  //   not accepted).
+  // * An HTTP GET on the URL must yield a [google.protobuf.Type][]
+  //   value in binary format, or produce an error.
+  // * Applications are allowed to cache lookup results based on the
+  //   URL, or have them precompiled into a binary to avoid any
+  //   lookup. Therefore, binary compatibility needs to be preserved
+  //   on changes to types. (Use versioned type names to manage
+  //   breaking changes.)
+  //
+  // Schemes other than `http`, `https` (or the empty scheme) might be
+  // used with implementation specific semantics.
+  //
+  string type_url = 1;
+
+  // Must be a valid serialized protocol buffer of the above specified type.
+  bytes value = 2;
+}
diff --git a/tools/grpcz/census.proto b/tools/grpcz/census.proto
new file mode 100644
index 0000000000000000000000000000000000000000..d1ff69400b05231382af485949ff0b408e1a11f5
--- /dev/null
+++ b/tools/grpcz/census.proto
@@ -0,0 +1,318 @@
+// Copyright 2017, Google Inc.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//     http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//TODO(ericgribkoff) Depend on this directly from the instrumentation-proto
+//repository.
+
+syntax = "proto3";
+
+package google.instrumentation;
+
+option java_package = "com.google.instrumentation.stats.proto";
+option java_outer_classname = "CensusProto";
+
+// All the census protos.
+//
+// Nomenclature notes:
+//   * Capitalized names below (like View) are protos.
+//   * Protos which describe types are named with a Descriptor suffix (e.g.
+//     MesurementDescriptor).
+//
+// Census lets you define the type and description of the data being measured
+// (e.g. the latency of an RPC or the number of CPU cycles spent on an
+// operation using MeasurementDescriptor. As individual measurements (a double
+// value) for are recorded, they are aggregated together into an
+// Aggregation. There are two Aggregation types available: Distribution
+// (describes the distribution of all measurements, possibly with a histogram)
+// and IntervalStats (the count and mean of measurements across specified time
+// periods). An Aggregation is described by an AggregationDescriptor.
+//
+// You can define how your measurements (described by a MeasurementDescriptor)
+// are broken down by Tag values and which Aggregations to use through a
+// ViewDescriptor. The output (all measurements broken down by tag values into
+// specific Aggregations) is called a View.
+
+
+// The following two types are copied from
+// google/protobuf/{duration,timestamp}.proto. Ideally, we would be able to
+// import them, but this causes compilation issues on C-based systems
+// (e.g. https://koti.kapsi.fi/jpa/nanopb/), which cannot process the C++
+// headers generated from the standard protobuf distribution. See the relevant
+// proto files for full documentation of these types.
+
+message Duration {
+  // Signed seconds of the span of time. Must be from -315,576,000,000
+  // to +315,576,000,000 inclusive.
+  int64 seconds = 1;
+
+  // Signed fractions of a second at nanosecond resolution of the span
+  // of time. Durations less than one second are represented with a 0
+  // `seconds` field and a positive or negative `nanos` field. For durations
+  // of one second or more, a non-zero value for the `nanos` field must be
+  // of the same sign as the `seconds` field. Must be from -999,999,999
+  // to +999,999,999 inclusive.
+  int32 nanos = 2;
+}
+
+message Timestamp {
+  // Represents seconds of UTC time since Unix epoch
+  // 1970-01-01T00:00:00Z. Must be from from 0001-01-01T00:00:00Z to
+  // 9999-12-31T23:59:59Z inclusive.
+  int64 seconds = 1;
+
+  // Non-negative fractions of a second at nanosecond resolution. Negative
+  // second values with fractions must still have non-negative nanos values
+  // that count forward in time. Must be from 0 to 999,999,999
+  // inclusive.
+  int32 nanos = 2;
+}
+
+// MeasurementDescriptor describes a data point (measurement) type.
+message MeasurementDescriptor {
+  // A descriptive name, e.g. rpc_latency, cpu. Must be unique.
+  string name = 1;
+
+  // More detailed description of the resource, used in documentation.
+  string description = 2;
+
+  // Fundamental units of measurement supported by Census
+  // TODO(aveitch): expand this to include other S.I. units?
+  enum BasicUnit {
+    UNKNOWN = 0;    // Implementations should not use this
+    SCALAR = 1;     // Dimensionless
+    BITS = 2;       // A single bit
+    BYTES = 3;      // An 8-bit byte
+    SECONDS = 4;    // S.I. unit
+    CORES = 5;      // CPU core usage
+    MAX_UNITS = 6;  // Last defined value; implementations should only use
+                    // this for validation.
+  }
+
+  // MeasurementUnit lets you build compound units of the form
+  //   10^n * (A * B * ...) / (X * Y * ...),
+  // where the elements in the numerator and denominator are all BasicUnits.  A
+  // MeasurementUnit must have at least one BasicUnit in its numerator.
+  //
+  // To specify multiplication in the numerator or denominator, simply specify
+  // multiple numerator or denominator fields.  For example:
+  //
+  // - byte-seconds (i.e. bytes * seconds):
+  //     numerator: BYTES
+  //     numerator: SECS
+  //
+  // - events/sec^2 (i.e. rate of change of events/sec):
+  //     numerator: SCALAR
+  //     denominator: SECS
+  //     denominator: SECS
+  //
+  // To specify multiples (in power of 10) of units, specify a non-zero
+  // 'power10' value, for example:
+  //
+  // - MB/s (i.e. megabytes / s):
+  //     power10: 6
+  //     numerator: BYTES
+  //     denominator: SECS
+  //
+  // - nanoseconds
+  //     power10: -9
+  //     numerator: SECS
+  message MeasurementUnit {
+    int32 power10 = 1;
+    repeated BasicUnit numerators = 2;
+    repeated BasicUnit denominators = 3;
+  }
+
+  // The units used by this type of measurement.
+  MeasurementUnit unit = 3;
+}
+
+// An aggregation summarizes a series of individual measurements. There are
+// two types of aggregation (IntervalAggregation and DistributionAggregation),
+// unique types of each can be set using descriptors for each.
+
+// DistributionAggregation contains summary statistics for a population of
+// values and, optionally, a histogram representing the distribution of those
+// values across a specified set of histogram buckets, as defined in
+// DistributionAggregationDescriptor.bucket_bounds.
+//
+// The summary statistics are the count, mean, minimum, and the maximum of the
+// set of population of values.
+//
+// Although it is not forbidden, it is generally a bad idea to include
+// non-finite values (infinities or NaNs) in the population of values, as this
+// will render the `mean` field meaningless.
+message DistributionAggregation {
+  // The number of values in the population. Must be non-negative.
+  int64 count = 1;
+
+  // The arithmetic mean of the values in the population. If `count` is zero
+  // then this field must be zero.
+  double mean = 2;
+
+  // The sum of the values in the population.  If `count` is zero then this
+  // field must be zero.
+  double sum = 3;
+
+  // Describes a range of population values.
+  message Range {
+    // The minimum of the population values.
+    double min = 1;
+    // The maximum of the population values.
+    double max = 2;
+  }
+
+  // The range of the population values. If `count` is zero, this field will not
+  // be defined.
+  Range range = 4;
+
+  // A Distribution may optionally contain a histogram of the values in the
+  // population. The histogram is given in `bucket_count` as counts of values
+  // that fall into one of a sequence of non-overlapping buckets, as described
+  // by `DistributionAggregationDescriptor.bucket_boundaries`. The sum of the
+  // values in `bucket_counts` must equal the value in `count`.
+  //
+  // Bucket counts are given in order under the numbering scheme described
+  // above (the underflow bucket has number 0; the finite buckets, if any,
+  // have numbers 1 through N-2; the overflow bucket has number N-1).
+  //
+  // The size of `bucket_count` must be no greater than N as defined in
+  // `bucket_boundaries`.
+  //
+  // Any suffix of trailing zero bucket_count fields may be omitted.
+  repeated int64 bucket_counts = 5;
+
+  // Tags associated with this DistributionAggregation. These will be filled
+  // in based on the View specification.
+  repeated Tag tags = 6;
+}
+
+message DistributionAggregationDescriptor {
+  // A Distribution may optionally contain a histogram of the values in the
+  // population. The bucket boundaries for that histogram are described by
+  // `bucket_bounds`. This defines `size(bucket_bounds) + 1` (= N)
+  // buckets. The boundaries for bucket index i are:
+  //
+  // [-infinity, bucket_bounds[i]) for i == 0
+  // [bucket_bounds[i-1], bucket_bounds[i]) for 0 < i < N-2
+  // [bucket_bounds[i-1], +infinity) for i == N-1
+  //
+  // i.e. an underflow bucket (number 0), zero or more finite buckets (1
+  // through N - 2, and an overflow bucket (N - 1), with inclusive lower
+  // bounds and exclusive upper bounds.
+  //
+  // If `bucket_bounds` has no elements (zero size), then there is no
+  // histogram associated with the Distribution. If `bucket_bounds` has only
+  // one element, there are no finite buckets, and that single element is the
+  // common boundary of the overflow and underflow buckets. The values must
+  // be monotonically increasing.
+  repeated double bucket_bounds = 1;
+}
+
+// An IntervalAggreation records summary stats over various time
+// windows. These stats are approximate, with the degree of accuracy
+// controlled by setting the n_sub_intervals parameter in the
+// IntervalAggregationDescriptor.
+message IntervalAggregation {
+  // Summary statistic over a single time interval.
+  message Interval {
+    // The interval duration. Must be positive.
+    Duration interval_size = 1;
+    // Approximate number of measurements recorded in this interval.
+    double count = 2;
+    // The cumulative sum of measurements in this interval.
+    double sum = 3;
+  }
+
+  // Full set of intervals for this aggregation.
+  repeated Interval intervals = 1;
+
+  // Tags associated with this IntervalAggregation. These will be filled in
+  // based on the View specification.
+  repeated Tag tags = 2;
+}
+
+// An IntervalAggreationDescriptor specifies time intervals for an
+// IntervalAggregation.
+message IntervalAggregationDescriptor {
+  // Number of internal sub-intervals to use when collecting stats for each
+  // interval. The max error in interval measurements will be approximately
+  // 1/n_sub_intervals (although in practice, this will only be approached in
+  // the presence of very large and bursty workload changes), and underlying
+  // memory usage will be roughly proportional to the value of this
+  // field. Must be in the range [2, 20]. A value of 5 will be used if this is
+  // unspecified.
+  int32 n_sub_intervals = 1;
+
+  // The size of each interval, as a time duration. Must have at least one
+  // element.
+  repeated Duration interval_sizes = 2;
+}
+
+// A Tag: key-value pair.
+message Tag {
+  string key = 1;
+  string value = 2;
+}
+
+// A ViewDescriptor specifies an AggregationDescriptor and a set of tag
+// keys. Views instantiated from this descriptor will contain Aggregations
+// broken down by the unique set of matching tag values for each measurement.
+message ViewDescriptor {
+  // Name of view. Must be unique.
+  string name = 1;
+
+  // More detailed description, for documentation purposes.
+  string description = 2;
+
+  // Name of a MeasurementDescriptor to be used for this view.
+  string measurement_descriptor_name = 3;
+
+  // Aggregation type to associate with View.
+  oneof aggregation {
+    IntervalAggregationDescriptor interval_aggregation = 4;
+    DistributionAggregationDescriptor distribution_aggregation = 5;
+  }
+
+  // Tag keys to match with a given measurement. If no keys are specified,
+  // then all stats are recorded. Keys must be unique.
+  repeated string tag_keys = 6;
+}
+
+// DistributionView contains all aggregations for a view specified using a
+// DistributionAggregationDescriptor.
+message DistributionView {
+  // Aggregations - each will have a unique set of tag values for the tag_keys
+  // associated with the corresponding View.
+  repeated DistributionAggregation aggregations = 1;
+
+  // Start and end timestamps over which aggregations was accumulated.
+  Timestamp start = 2;
+  Timestamp end = 3;
+}
+
+// IntervalView contains all aggregations for a view specified using a
+// IntervalAggregationDescriptor.
+message IntervalView {
+  // Aggregations - each will have a unique set of tag values for the tag_keys
+  // associated with the corresponding View.
+  repeated IntervalAggregation aggregations = 1;
+}
+
+// A View contains the aggregations based on a ViewDescriptor.
+message View {
+  // ViewDescriptor name associated with this set of View.
+  string view_name = 1;
+
+  oneof view {
+    DistributionView distribution_view = 2;
+    IntervalView interval_view = 3;
+  }
+}
diff --git a/tools/grpcz/empty.proto b/tools/grpcz/empty.proto
new file mode 100644
index 0000000000000000000000000000000000000000..03cacd233088d07d8c5d167c021efb5525cb4cb9
--- /dev/null
+++ b/tools/grpcz/empty.proto
@@ -0,0 +1,52 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+package google.protobuf;
+
+option csharp_namespace = "Google.Protobuf.WellKnownTypes";
+option go_package = "github.com/golang/protobuf/ptypes/empty";
+option java_package = "com.google.protobuf";
+option java_outer_classname = "EmptyProto";
+option java_multiple_files = true;
+option objc_class_prefix = "GPB";
+option cc_enable_arenas = true;
+
+// A generic empty message that you can re-use to avoid defining duplicated
+// empty messages in your APIs. A typical example is to use it as the request
+// or the response type of an API method. For instance:
+//
+//     service Foo {
+//       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+//     }
+//
+// The JSON representation for `Empty` is empty JSON object `{}`.
+message Empty {}
diff --git a/tools/grpcz/grpcz_client.cc b/tools/grpcz/grpcz_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..afca3b0532f9909a988859089c9eaba0938cd907
--- /dev/null
+++ b/tools/grpcz/grpcz_client.cc
@@ -0,0 +1,174 @@
+/*
+ *
+ * Copyright 2017, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <iostream>
+#include <memory>
+#include <string>
+
+#include <google/protobuf/util/json_util.h>
+#include <grpc++/grpc++.h>
+#include <grpc/support/log.h>
+
+#include "gflags/gflags.h"
+#include "mongoose.h"
+
+// TODO (makdharma): remove local copies of these protos
+#include "tools/grpcz/census.grpc.pb.h"
+#include "tools/grpcz/monitoring.grpc.pb.h"
+
+DEFINE_string(server, "127.0.0.1:50052",
+              "file path (or host:port) where grpcz server is running");
+DEFINE_string(http_port, "8000",
+              "Port id for accessing the HTTP server that renders /grpcz page");
+DEFINE_bool(print, false, "only print the output and quit");
+
+using grpc::Channel;
+using grpc::ClientContext;
+using grpc::Status;
+
+using ::grpc::instrumentation::v1alpha::CanonicalRpcStats;
+using ::grpc::instrumentation::v1alpha::Monitoring;
+
+static const std::string static_html_header =
+    "<!DOCTYPE html> <html> <head> <style> \
+table { border-collapse: collapse; width: 100%; } \
+table, td, th { border: 1px solid black; } \
+</style> </head> <body>\
+<div id='stats' stats='";
+
+static const std::string static_html_footer =
+    "' class='hidden'></div>\
+<h1> GRPCZ FTW </h1> <div id='table'> </div> \
+<script> \
+  var canonical_stats = JSON.parse(\
+            document.getElementById('stats').getAttribute('stats')); \
+  var table = document.createElement('table'); \
+  for (var key in canonical_stats) { \
+    name = canonical_stats[key]['view']['viewName']; \
+    distribution = canonical_stats[key]['view']['distributionView']; \
+    interval = canonical_stats[key]['view']['intervalView']; \
+    value = (interval == undefined) ? \
+      JSON.stringify(distribution, null, ' ') : \
+      JSON.stringify(interval, null, ' '); \
+    var row = table.insertRow(-1); \
+    var col1 = row.insertCell(0); \
+    var col2 = row.insertCell(1); \
+    col1.innerHTML = name; \
+    col2.innerHTML = '<pre>' + value + '</pre>'; \
+  } \
+  document.getElementById('table').appendChild(table); \
+</script> </body> </html>";
+
+class GrpczClient {
+ public:
+  GrpczClient(std::shared_ptr<Channel> channel)
+      : stub_(Monitoring::NewStub(channel)) {}
+
+  std::string GetStatsAsJson() {
+    const ::google::protobuf::Empty request;
+    CanonicalRpcStats reply;
+    ClientContext context;
+    Status status = stub_->GetCanonicalRpcStats(&context, request, &reply);
+
+    if (status.ok()) {
+      std::string json_str;
+      ::google::protobuf::util::MessageToJsonString(reply, &json_str);
+      return json_str;
+    } else {
+      static const std::string error_message_json =
+          "{\"grpcz Access Error\"\
+      :{\"view\":{\"viewName\":\"grpcz Access Error\",\
+      \"intervalView\":\"Server not running?\"}}}";
+      std::cout << status.error_code() << ":= " << status.error_message()
+                << std::endl;
+      return error_message_json;
+    }
+  }
+
+ private:
+  std::unique_ptr<Monitoring::Stub> stub_;
+};
+
+static struct mg_serve_http_opts s_http_server_opts;
+std::unique_ptr<GrpczClient> g_grpcz_client;
+
+static void ev_handler(struct mg_connection *nc, int ev, void *p) {
+  if (ev == MG_EV_HTTP_REQUEST) {
+    mg_serve_http(nc, (struct http_message *)p, s_http_server_opts);
+  }
+}
+
+static void grpcz_handler(struct mg_connection *nc, int ev, void *ev_data) {
+  (void)ev;
+  (void)ev_data;
+  gpr_log(GPR_INFO, "fetching grpcz stats from %s", FLAGS_server.c_str());
+  std::string json_str = g_grpcz_client->GetStatsAsJson();
+  std::string rendered_html =
+      static_html_header + json_str + static_html_footer;
+  mg_printf(nc, "HTTP/1.0 200 OK\r\n\r\n%s", rendered_html.c_str());
+  nc->flags |= MG_F_SEND_AND_CLOSE;
+}
+
+int main(int argc, char **argv) {
+  gflags::ParseCommandLineFlags(&argc, &argv, true);
+
+  // Create a client
+  g_grpcz_client.reset(new GrpczClient(
+      grpc::CreateChannel(FLAGS_server, grpc::InsecureChannelCredentials())));
+  if (FLAGS_print) {
+    g_grpcz_client->GetStatsAsJson();
+    return 0;
+  }
+
+  // Set up a mongoose webserver handler
+  struct mg_mgr mgr;
+  mg_mgr_init(&mgr, NULL);
+  gpr_log(GPR_INFO, "Starting grpcz web server on port %s\n",
+          FLAGS_http_port.c_str());
+
+  struct mg_connection *nc = mg_bind(&mgr, FLAGS_http_port.c_str(), ev_handler);
+  if (nc == NULL) {
+    gpr_log(GPR_ERROR, "Failed to create listener on port %s\n",
+            FLAGS_http_port.c_str());
+    return -11;
+  }
+  mg_register_http_endpoint(nc, "/grpcz", grpcz_handler);
+  mg_set_protocol_http_websocket(nc);
+
+  // Poll in a loop and serve /grpcz pages
+  for (;;) {
+    mg_mgr_poll(&mgr, 100);
+  }
+  mg_mgr_free(&mgr);
+  return 0;
+}
diff --git a/tools/grpcz/monitoring.proto b/tools/grpcz/monitoring.proto
new file mode 100644
index 0000000000000000000000000000000000000000..ec3dfe9f74cfbe3458a06fb9f7d130841a8f85db
--- /dev/null
+++ b/tools/grpcz/monitoring.proto
@@ -0,0 +1,131 @@
+// Copyright 2017, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This file defines an interface for exporting monitoring information
+// out of gRPC servers.
+syntax = "proto3";
+
+// TODO(ericgribkoff) Figure out how to manage the external Census proto
+// dependency.
+import "tools/grpcz/census.proto";
+import "tools/grpcz/empty.proto";
+import "tools/grpcz/any.proto";
+
+package grpc.instrumentation.v1alpha;
+
+option java_multiple_files = true;
+option java_package = "io.grpc.instrumentation.v1alpha";
+option java_outer_classname = "MonitoringProto";
+
+service Monitoring {
+  // Return canonical RPC stats
+  rpc GetCanonicalRpcStats(google.protobuf.Empty) returns (CanonicalRpcStats) {
+  }
+
+  // Query the server for specific stats
+  rpc GetStats(StatsRequest) returns (StatsResponse) {
+    // TODO(aveitch, ericgribkoff): Pease define the stats response message
+    // StatsRequest would specifically identify the stats to be returned.
+  }
+
+  // Request the server to stream back snapshots of the requested stats
+  rpc WatchStats(StatsRequest) returns (stream StatsResponse) {
+  }
+
+
+  // Return request traces.
+  rpc GetRequestTraces(TraceRequest) returns(TraceResponse) {
+  // TODO(aveitch): Please define the messages here
+  }
+
+  // Return application-defined groups of monitoring data.
+  // This is a low level facility to allow extension of the monitoring API to
+  // application-specific monitoring data. Frameworks may use this to define
+  // additional groups of monitoring data made available by servers.
+  rpc GetCustomMonitoringData(MonitoringDataGroup)
+    returns (CustomMonitoringData) {
+  }
+
+}
+
+// Canonical RPC stats exported by gRPC.
+message CanonicalRpcStats {
+  // Wrapper combining View and ViewDescriptor.
+  message View {
+    google.instrumentation.MeasurementDescriptor measurement_descriptor = 1;
+    google.instrumentation.ViewDescriptor view_descriptor = 2;
+    google.instrumentation.View view = 3;
+  }
+
+  View rpc_client_errors = 1;
+  View rpc_client_completed_rpcs = 2;
+  View rpc_client_started_rpcs = 3;
+  View rpc_client_elapsed_time = 4;
+  View rpc_client_server_elapsed_time = 5;
+  View rpc_client_request_bytes = 6;
+  View rpc_client_response_bytes = 7;
+  View rpc_client_request_count = 8;
+  View rpc_client_response_count = 9;
+  View rpc_server_errors = 10;
+  View rpc_server_completed_rpcs = 11;
+  View rpc_server_server_elapsed_time = 12;
+  View rpc_server_request_bytes = 13;
+  View rpc_server_response_bytes = 14;
+  View rpc_server_request_count = 15;
+  View rpc_server_response_count = 16;
+  View rpc_server_elapsed_time = 17;
+  //TODO(ericgribkoff) Add minute-hour interval stats.
+}
+
+message StatsRequest {
+  // TODO(aveitch): Complete definition of this type
+}
+
+message StatsResponse {
+  // TODO(aveitch): Complete definition of this type
+}
+
+message TraceRequest {
+  // TODO(aveitch): Complete definition of this type
+}
+
+message TraceResponse {
+  // TODO(aveitch): Complete definition of this type
+}
+
+message MonitoringDataGroup {
+  string name = 1;  // name of a group of monitoring data
+}
+
+// The wrapper for custom monitoring data.
+message CustomMonitoringData {
+  // can be any application specific monitoring data
+  Any contents = 1;
+}
+
diff --git a/tools/run_tests/sanity/check_submodules.sh b/tools/run_tests/sanity/check_submodules.sh
index 0b68319d29019c6b04d0ba1c483e34410af3e56e..cfe4e2731c04e0ec19d2177dfdfbbd5f60564850 100755
--- a/tools/run_tests/sanity/check_submodules.sh
+++ b/tools/run_tests/sanity/check_submodules.sh
@@ -44,7 +44,7 @@ cat << EOF | awk '{ print $1 }' | sort > $want_submodules
  44c25c892a6229b20db7cd9dc05584ea865896de third_party/benchmark (v0.1.0-343-g44c25c8)
  78684e5b222645828ca302e56b40b9daff2b2d27 third_party/boringssl (78684e5)
  886e7d75368e3f4fab3f4d0d3584e4abfc557755 third_party/boringssl-with-bazel (version_for_cocoapods_7.0-857-g886e7d7)
- f8a0efe03aa69b3336d8e228b37d4ccb17324b88 third_party/gflags (v2.2.0)
+ 30dbc81fb5ffdc98ea9b14b1918bfe4e8779b26e third_party/gflags (v2.2.0)
  c99458533a9b4c743ed51537e25989ea55944908 third_party/googletest (release-1.7.0)
  a428e42072765993ff674fda72863c9f1aa2d268 third_party/protobuf (v3.1.0-alpha-1)
  bcad91771b7f0bff28a1cac1981d7ef2b9bcef3c third_party/thrift (bcad917)