diff --git a/vendor/go.opentelemetry.io/otel/api/metric/counter.go b/vendor/go.opentelemetry.io/otel/api/metric/counter.go
new file mode 100644
index 0000000..c03421d
--- /dev/null
+++ b/vendor/go.opentelemetry.io/otel/api/metric/counter.go
@@ -0,0 +1,95 @@
+// Copyright The 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 metric
+
+import (
+	"context"
+
+	"go.opentelemetry.io/otel/label"
+)
+
+// Float64Counter is a metric that accumulates float64 values.
+type Float64Counter struct {
+	syncInstrument
+}
+
+// Int64Counter is a metric that accumulates int64 values.
+type Int64Counter struct {
+	syncInstrument
+}
+
+// BoundFloat64Counter is a bound instrument for Float64Counter.
+//
+// It inherits the Unbind function from syncBoundInstrument.
+type BoundFloat64Counter struct {
+	syncBoundInstrument
+}
+
+// BoundInt64Counter is a boundInstrument for Int64Counter.
+//
+// It inherits the Unbind function from syncBoundInstrument.
+type BoundInt64Counter struct {
+	syncBoundInstrument
+}
+
+// Bind creates a bound instrument for this counter. The labels are
+// associated with values recorded via subsequent calls to Record.
+func (c Float64Counter) Bind(labels ...label.KeyValue) (h BoundFloat64Counter) {
+	h.syncBoundInstrument = c.bind(labels)
+	return
+}
+
+// Bind creates a bound instrument for this counter. The labels are
+// associated with values recorded via subsequent calls to Record.
+func (c Int64Counter) Bind(labels ...label.KeyValue) (h BoundInt64Counter) {
+	h.syncBoundInstrument = c.bind(labels)
+	return
+}
+
+// Measurement creates a Measurement object to use with batch
+// recording.
+func (c Float64Counter) Measurement(value float64) Measurement {
+	return c.float64Measurement(value)
+}
+
+// Measurement creates a Measurement object to use with batch
+// recording.
+func (c Int64Counter) Measurement(value int64) Measurement {
+	return c.int64Measurement(value)
+}
+
+// Add adds the value to the counter's sum. The labels should contain
+// the keys and values to be associated with this value.
+func (c Float64Counter) Add(ctx context.Context, value float64, labels ...label.KeyValue) {
+	c.directRecord(ctx, NewFloat64Number(value), labels)
+}
+
+// Add adds the value to the counter's sum. The labels should contain
+// the keys and values to be associated with this value.
+func (c Int64Counter) Add(ctx context.Context, value int64, labels ...label.KeyValue) {
+	c.directRecord(ctx, NewInt64Number(value), labels)
+}
+
+// Add adds the value to the counter's sum using the labels
+// previously bound to this counter via Bind()
+func (b BoundFloat64Counter) Add(ctx context.Context, value float64) {
+	b.directRecord(ctx, NewFloat64Number(value))
+}
+
+// Add adds the value to the counter's sum using the labels
+// previously bound to this counter via Bind()
+func (b BoundInt64Counter) Add(ctx context.Context, value int64) {
+	b.directRecord(ctx, NewInt64Number(value))
+}