Fix license header, typos and lints (#160)

* Fix license header, typos and lints

* Update import order

config/configerror/configerror.go

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package configerror contains the common errors caused by malformed configs.
 package configerror
 
 import "errors"

consumer/consumer.go

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package consumer contains interfaces that receive and process consumerdata.
 package consumer
 
 import (

consumer/consumerdata/consumerdata.go

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package consumerdata contains data structures that holds proto metrics/spans, node and resource.
 package consumerdata
 
 import (

exporter/exporter.go

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package exporter contains interfaces that wraps trace/metrics exporter.
 package exporter
 
 import (

internal/collector/telemetry/process_telemetry.go

@@ -1,3 +1,17 @@
+// Copyright 2019, OpenTelemetry 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 telemetry
 
 import (

processor/processor.go

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package processor contains interfaces that compose trace/metrics consumers.
 package processor
 
 import (

receiver/prometheusreceiver/internal/internal_test.go

@@ -17,11 +17,13 @@ package internal
 import (
 	"context"
 	"errors"
-	"github.com/open-telemetry/opentelemetry-service/consumer/consumerdata"
+	"sync"
+
 	"github.com/prometheus/prometheus/pkg/labels"
 	"github.com/prometheus/prometheus/scrape"
 	"go.uber.org/zap"
-	"sync"
+
+	"github.com/open-telemetry/opentelemetry-service/consumer/consumerdata"
 )
 
 // test helpers

service/builder/builder.go

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package builder contains the logic on parsing configs and building receivers,
+// exporters, pipeplines and tail sampling.
 package builder
 
 import (