opentracing -> opencensus (#802)

* update vendor directory, add go.opencensus.io

* update imports

* oops

* s/opentracing/opencensus/ & remove prometheus / zipkin stuff & remove old stats

* the dep train rides again

* fix gin build

* deps from last guy

* start in on the agent metrics

* she builds

* remove tags for now, cardinality error is fussing. subscribe instead of register

* update to patched version of opencensus to proceed for now TODO switch to a release

* meh

fix imports

* println debug the bad boys

* lace it with the tags

* update deps again

* fix all inconsistent cardinality errors

* add our own logger

* fix init

* fix oom measure

* remove bugged removal code

* fix s3 measures

* fix prom handler nil

vendor/go.opencensus.io/plugin/ocgrpc/server_metrics.go

@@ -0,0 +1,100 @@
+// Copyright 2017, OpenCensus Authors
+//
+// 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.
+//
+
+package ocgrpc
+
+import (
+	"go.opencensus.io/stats"
+	"go.opencensus.io/stats/view"
+	"go.opencensus.io/tag"
+)
+
+// The following variables are measures are recorded by ServerHandler:
+var (
+	ServerErrorCount, _        = stats.Int64("grpc.io/server/error_count", "RPC Errors", stats.UnitNone)
+	ServerServerElapsedTime, _ = stats.Float64("grpc.io/server/server_elapsed_time", "Server elapsed time in msecs", stats.UnitMilliseconds)
+	ServerRequestBytes, _      = stats.Int64("grpc.io/server/request_bytes", "Request bytes", stats.UnitBytes)
+	ServerResponseBytes, _     = stats.Int64("grpc.io/server/response_bytes", "Response bytes", stats.UnitBytes)
+	ServerStartedCount, _      = stats.Int64("grpc.io/server/started_count", "Number of server RPCs (streams) started", stats.UnitNone)
+	ServerFinishedCount, _     = stats.Int64("grpc.io/server/finished_count", "Number of server RPCs (streams) finished", stats.UnitNone)
+	ServerRequestCount, _      = stats.Int64("grpc.io/server/request_count", "Number of server RPC request messages", stats.UnitNone)
+	ServerResponseCount, _     = stats.Int64("grpc.io/server/response_count", "Number of server RPC response messages", stats.UnitNone)
+)
+
+// TODO(acetechnologist): This is temporary and will need to be replaced by a
+// mechanism to load these defaults from a common repository/config shared by
+// all supported languages. Likely a serialized protobuf of these defaults.
+
+// Predefined views may be subscribed to collect data for the above measures.
+// As always, you may also define your own custom views over measures collected by this
+// package. These are declared as a convenience only; none are subscribed by
+// default.
+var (
+	ServerErrorCountView, _ = view.New(
+		"grpc.io/server/error_count",
+		"RPC Errors",
+		[]tag.Key{KeyMethod, KeyStatus},
+		ServerErrorCount,
+		view.CountAggregation{})
+
+	ServerServerElapsedTimeView, _ = view.New(
+		"grpc.io/server/server_elapsed_time",
+		"Server elapsed time in msecs",
+		[]tag.Key{KeyMethod},
+		ServerServerElapsedTime,
+		DefaultMillisecondsDistribution)
+
+	ServerRequestBytesView, _ = view.New(
+		"grpc.io/server/request_bytes",
+		"Request bytes",
+		[]tag.Key{KeyMethod},
+		ServerRequestBytes,
+		DefaultBytesDistribution)
+
+	ServerResponseBytesView, _ = view.New(
+		"grpc.io/server/response_bytes",
+		"Response bytes",
+		[]tag.Key{KeyMethod},
+		ServerResponseBytes,
+		DefaultBytesDistribution)
+
+	ServerRequestCountView, _ = view.New(
+		"grpc.io/server/request_count",
+		"Count of request messages per server RPC",
+		[]tag.Key{KeyMethod},
+		ServerRequestCount,
+		DefaultMessageCountDistribution)
+
+	ServerResponseCountView, _ = view.New(
+		"grpc.io/server/response_count",
+		"Count of response messages per server RPC",
+		[]tag.Key{KeyMethod},
+		ServerResponseCount,
+		DefaultMessageCountDistribution)
+)
+
+// All default server views provided by this package:
+var (
+	DefaultServerViews = []*view.View{
+		ServerErrorCountView,
+		ServerServerElapsedTimeView,
+		ServerRequestBytesView,
+		ServerResponseBytesView,
+		ServerRequestCountView,
+		ServerResponseCountView,
+	}
+)
+
+// TODO(jbd): Add roundtrip_latency, uncompressed_request_bytes, uncompressed_response_bytes, request_count, response_count.