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// Copyright 2018, 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 metric_test
import (
"net/http"
"go.opencensus.io/metric"
"go.opencensus.io/metric/metricdata"
)
func ExampleRegistry_AddInt64Gauge() {
r := metric.NewRegistry()
// TODO: allow exporting from a registry
g, _ := r.AddInt64Gauge("active_request",
metric.WithDescription("Number of active requests, per method."),
metric.WithUnit(metricdata.UnitDimensionless),
metric.WithLabelKeys("method"))
http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
e, _ := g.GetEntry(metricdata.NewLabelValue(request.Method))
e.Add(1)
defer e.Add(-1)
// process request ...
})
}
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