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opentelemetry-go/exporters/metric/prometheus/example_test.go

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// 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 prometheus_test
import (
"bytes"
"context"
"fmt"
"io/ioutil"
"net/http"
"net/http/httptest"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/metric/prometheus"
"go.opentelemetry.io/otel/metric"
controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
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"go.opentelemetry.io/otel/sdk/resource"
)
// This test demonstrates that it is relatively difficult to setup a
// Prometheus export pipeline:
//
// 1. The default boundaries are difficult to pass, should be []float instead of []number.Number
//
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// TODO: Address this issue.
func ExampleNewExportPipeline() {
// Create a resource, with builtin attributes plus R=V.
res, err := resource.New(
context.Background(),
resource.WithoutBuiltin(), // Test-only!
resource.WithAttributes(attribute.String("R", "V")),
)
if err != nil {
panic(err)
}
// Create a meter
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exporter, err := prometheus.NewExportPipeline(
prometheus.Config{},
controller.WithResource(res),
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)
if err != nil {
panic(err)
}
meter := exporter.MeterProvider().Meter("example")
ctx := context.Background()
// Use two instruments
counter := metric.Must(meter).NewInt64Counter(
"a.counter",
metric.WithDescription("Counts things"),
)
recorder := metric.Must(meter).NewInt64ValueRecorder(
"a.valuerecorder",
metric.WithDescription("Records values"),
)
counter.Add(ctx, 100, attribute.String("key", "value"))
recorder.Record(ctx, 100, attribute.String("key", "value"))
// GET the HTTP endpoint
var input bytes.Buffer
resp := httptest.NewRecorder()
req, err := http.NewRequest("GET", "/", &input)
if err != nil {
panic(err)
}
exporter.ServeHTTP(resp, req)
data, err := ioutil.ReadAll(resp.Result().Body)
if err != nil {
panic(err)
}
fmt.Print(string(data))
// Output:
// # HELP a_counter Counts things
// # TYPE a_counter counter
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// a_counter{R="V",key="value"} 100
// # HELP a_valuerecorder Records values
// # TYPE a_valuerecorder histogram
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// a_valuerecorder_bucket{R="V",key="value",le="+Inf"} 1
// a_valuerecorder_sum{R="V",key="value"} 100
// a_valuerecorder_count{R="V",key="value"} 1
}