Update the examples for the 1.7.0 release (#3719)

* WIP on example updates

* update prometheus version and add more cycles to the otlp example

* no spots here

examples/build.gradle

@@ -4,8 +4,8 @@ plugins {
 }
 
 ext {
-  openTelemetryVersion = "1.6.0"
-  openTelemetryAlphaVersion = "1.6.0-alpha"
+  openTelemetryVersion = "1.7.0"
+  openTelemetryAlphaVersion = "1.7.0-alpha"
 
   grpcVersion = '1.34.1'
   protobufVersion = '3.11.4'

examples/logging/src/main/java/io/opentelemetry/example/logging/ExampleConfiguration.java

@@ -5,10 +5,11 @@ import io.opentelemetry.exporter.logging.LoggingMetricExporter;
 import io.opentelemetry.exporter.logging.LoggingSpanExporter;
 import io.opentelemetry.sdk.OpenTelemetrySdk;
 import io.opentelemetry.sdk.metrics.SdkMeterProvider;
-import io.opentelemetry.sdk.metrics.export.IntervalMetricReader;
+import io.opentelemetry.sdk.metrics.export.MetricReaderFactory;
+import io.opentelemetry.sdk.metrics.export.PeriodicMetricReader;
 import io.opentelemetry.sdk.trace.SdkTracerProvider;
 import io.opentelemetry.sdk.trace.export.SimpleSpanProcessor;
-import java.util.Collections;
+import java.time.Duration;
 
 /**
  * All SDK management takes place here, away from the instrumentation code, which should only access
@@ -25,16 +26,17 @@ public final class ExampleConfiguration {
    * @return A ready-to-use {@link OpenTelemetry} instance.
    */
   public static OpenTelemetry initOpenTelemetry() {
-    // This will be used to create instruments
-    SdkMeterProvider meterProvider = SdkMeterProvider.builder().buildAndRegisterGlobal();
+    // Create an instance of PeriodicMetricReaderFactory and configure it
+    // to export via the logging exporter
+    MetricReaderFactory periodicReaderFactory =
+        PeriodicMetricReader.create(
+            new LoggingMetricExporter(), Duration.ofMillis(METRIC_EXPORT_INTERVAL_MS));
 
-    // Create an instance of IntervalMetricReader and configure it
-    // to read metrics from the meterProvider and export them to the logging exporter
-    IntervalMetricReader.builder()
-        .setMetricExporter(new LoggingMetricExporter())
-        .setMetricProducers(Collections.singleton(meterProvider))
-        .setExportIntervalMillis(METRIC_EXPORT_INTERVAL_MS)
-        .build();
+    // This will be used to create instruments
+    SdkMeterProvider meterProvider =
+        SdkMeterProvider.builder()
+            .registerMetricReader(periodicReaderFactory)
+            .buildAndRegisterGlobal();
 
     // Tracer provider configured to export spans with SimpleSpanProcessor using
     // the logging exporter.

examples/otlp/src/main/java/io/opentelemetry/example/otlp/ExampleConfiguration.java

@@ -12,10 +12,11 @@ import io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter;
 import io.opentelemetry.sdk.OpenTelemetrySdk;
 import io.opentelemetry.sdk.autoconfigure.OpenTelemetryResourceAutoConfiguration;
 import io.opentelemetry.sdk.metrics.SdkMeterProvider;
-import io.opentelemetry.sdk.metrics.export.IntervalMetricReader;
+import io.opentelemetry.sdk.metrics.export.MetricReaderFactory;
+import io.opentelemetry.sdk.metrics.export.PeriodicMetricReader;
 import io.opentelemetry.sdk.trace.SdkTracerProvider;
 import io.opentelemetry.sdk.trace.export.BatchSpanProcessor;
-import java.util.Collections;
+import java.time.Duration;
 import java.util.concurrent.TimeUnit;
 
 /**
@@ -45,7 +46,7 @@ public final class ExampleConfiguration {
     OpenTelemetrySdk openTelemetrySdk =
         OpenTelemetrySdk.builder().setTracerProvider(tracerProvider).buildAndRegisterGlobal();
 
-    Runtime.getRuntime().addShutdownHook(new Thread(tracerProvider::close));
+    Runtime.getRuntime().addShutdownHook(new Thread(tracerProvider::shutdown));
 
     return openTelemetrySdk;
   }
@@ -59,16 +60,15 @@ public final class ExampleConfiguration {
     // set up the metric exporter and wire it into the SDK and a timed reader.
     OtlpGrpcMetricExporter metricExporter = OtlpGrpcMetricExporter.getDefault();
 
-    SdkMeterProvider meterProvider = SdkMeterProvider.builder().buildAndRegisterGlobal();
-    IntervalMetricReader intervalMetricReader =
-        IntervalMetricReader.builder()
-            .setMetricExporter(metricExporter)
-            .setMetricProducers(Collections.singleton(meterProvider))
-            .setExportIntervalMillis(1000)
-            .buildAndStart();
+    MetricReaderFactory periodicReaderFactory =
+        PeriodicMetricReader.create(metricExporter, Duration.ofMillis(1000));
 
-    Runtime.getRuntime().addShutdownHook(new Thread(intervalMetricReader::shutdown));
+    SdkMeterProvider sdkMeterProvider =
+        SdkMeterProvider.builder()
+            .registerMetricReader(periodicReaderFactory)
+            .buildAndRegisterGlobal();
 
-    return meterProvider;
+    Runtime.getRuntime().addShutdownHook(new Thread(sdkMeterProvider::shutdown));
+    return sdkMeterProvider;
   }
 }

examples/otlp/src/main/java/io/opentelemetry/example/otlp/OtlpExporterExample.java

@@ -40,7 +40,7 @@ public final class OtlpExporterExample {
     LongCounter counter = meter.counterBuilder("example_counter").build();
     LongHistogram recorder = meter.histogramBuilder("super_timer").ofLongs().setUnit("ms").build();
 
-    for (int i = 0; i < 10; i++) {
+    for (int i = 0; i < 100; i++) {
       long startTime = System.currentTimeMillis();
       Span exampleSpan = tracer.spanBuilder("exampleSpan").startSpan();
       try (Scope scope = exampleSpan.makeCurrent()) {

examples/prometheus/build.gradle

@@ -8,8 +8,8 @@ ext.moduleName = "io.opentelemetry.examples.prometheus"
 dependencies {
     implementation("io.opentelemetry:opentelemetry-api")
     implementation("io.opentelemetry:opentelemetry-sdk")
-    implementation("io.prometheus:simpleclient:0.8.1")
-    implementation("io.prometheus:simpleclient_httpserver:0.8.1")
+    implementation("io.prometheus:simpleclient:0.12.0")
+    implementation("io.prometheus:simpleclient_httpserver:0.12.0")
 
     //alpha modules
     implementation("io.opentelemetry:opentelemetry-exporter-prometheus")

examples/prometheus/src/main/java/io/opentelemetry/example/prometheus/ExampleConfiguration.java

@@ -8,6 +8,7 @@ package io.opentelemetry.example.prometheus;
 import io.opentelemetry.api.metrics.MeterProvider;
 import io.opentelemetry.exporter.prometheus.PrometheusCollector;
 import io.opentelemetry.sdk.metrics.SdkMeterProvider;
+import io.opentelemetry.sdk.metrics.export.MetricReaderFactory;
 import io.prometheus.client.exporter.HTTPServer;
 import java.io.IOException;
 
@@ -21,12 +22,14 @@ public final class ExampleConfiguration {
    * @return A MeterProvider for use in instrumentation.
    */
   static MeterProvider initializeOpenTelemetry(int prometheusPort) throws IOException {
-    SdkMeterProvider meterProvider = SdkMeterProvider.builder().buildAndRegisterGlobal();
+    MetricReaderFactory prometheusReaderFactory = PrometheusCollector.create();
 
-    PrometheusCollector.builder().setMetricProducer(meterProvider).buildAndRegister();
+    SdkMeterProvider meterProvider =
+        SdkMeterProvider.builder()
+            .registerMetricReader(prometheusReaderFactory)
+            .buildAndRegisterGlobal();
 
     server = new HTTPServer(prometheusPort);
-
     return meterProvider;
   }