~/grpc-java/examples $ ./build/install/examples/bin/hello-world-client
Sep 24, 2022 1:50:33 PM io.grpc.examples.helloworld.HelloWorldClient greet
INFO: Will try to greet world ...
Sep 24, 2022 1:50:33 PM io.grpc.examples.helloworld.HelloWorldClient greet
INFO: Greeting: Hello world

~/grpc-java/examples $ ./build/install/examples/bin/hello-world-client
Sep 24, 2022 1:50:35 PM io.grpc.examples.helloworld.HelloWorldClient greet
INFO: Will try to greet world ...
Sep 24, 2022 1:50:35 PM io.grpc.examples.helloworld.HelloWorldClient greet
INFO: Greeting: Hello world

~/grpc-java/examples $ ./build/install/examples/bin/hello-world-server
Sep 24, 2022 1:50:09 PM io.grpc.examples.helloworld.HelloWorldServer start
INFO: Server started, listening on 50051
 

~/grpc-java/examples $ export JAVA_OPTS="-javaagent:opentelemetry-javaagent.jar"
~/grpc-java/examples $ export OTEL_TRACES_EXPORTER=logging

~/grpc-java/examples $ export JAVA_OPTS="-javaagent:opentelemetry-javaagent.jar"
~/grpc-java/examples $ export OTEL_TRACES_EXPORTER=logging
~/grpc-java/examples $ ./build/install/examples/bin/hello-world-server
[otel.javaagent 2022-09-24 14:07:51:024 +0200] [main] INFO io.opentelemetry.javaa
gent.tooling.VersionLogger - opentelemetry-javaagent - version: 1.18.0
Sep 24, 2022 2:07:53 PM io.grpc.examples.helloworld.HelloWorldServer start
INFO: Server started, listening on 50051

~/grpc-java/examples $ export JAVA_OPTS="-javaagent:opentelemetry-javaagent.jar"
~/grpc-java/examples $ export OTEL_TRACES_EXPORTER=logging
~/grpc-java/examples $ ./build/install/examples/bin/hello-world-client
[otel.javaagent 2022-09-24 14:27:21:991 +0200] [main] INFO io.opentelemetry.javaa
gent.tooling.VersionLogger - opentelemetry-javaagent - version: 1.18.0
Sep 24, 2022 2:27:24 PM io.grpc.examples.helloworld.HelloWorldClient greet
INFO: Will try to greet world ...
[otel.javaagent 2022-09-24 14:27:25:223 +0200] [main] INFO io.opentelemetry.expor
ter.logging.LoggingSpanExporter - 'helloworld.Greeter/SayHello' : 01aceb203db607f
b1219543673ed742c eea17e747f1cea5b CLIENT [tracer: io.opentelemetry.grpc-1.6:1.18
.0-alpha] AttributesMap{data={net.transport=ip_tcp, net.peer.name=localhost, net.
peer.port=50051, rpc.service=helloworld.Greeter, rpc.method=SayHello, thread.id=1
, rpc.system=grpc, thread.name=main, rpc.grpc.status_code=0}, capacity=128, total
AddedValues=9}
Sep 24, 2022 2:27:25 PM io.grpc.examples.helloworld.HelloWorldClient greet
INFO: Greeting: Hello world

~/grpc-java/examples $ export JAVA_OPTS="-javaagent:opentelemetry-javaagent.jar"
~/grpc-java/examples $ export OTEL_TRACES_EXPORTER=logging
~/grpc-java/examples $ ./build/install/examples/bin/hello-world-server
[otel.javaagent 2022-09-24 14:26:45:737 +0200] [main] INFO io.opentelemetry.javaa
gent.tooling.VersionLogger - opentelemetry-javaagent - version: 1.18.0
Sep 24, 2022 2:26:51 PM io.grpc.examples.helloworld.HelloWorldServer start
INFO: Server started, listening on 50051
[otel.javaagent 2022-09-24 14:27:25:196 +0200] [grpc-default-executor-0] INFO io.
opentelemetry.exporter.logging.LoggingSpanExporter - 'helloworld.Greeter/SayHello
' : 01aceb203db607fb1219543673ed742c 8479d2d44df0f580 SERVER [tracer: io.opentele
metry.grpc-1.6:1.18.0-alpha] AttributesMap{data={net.host.name=localhost, net.tra
nsport=ip_tcp, net.host.port=50051, rpc.service=helloworld.Greeter, net.sock.peer
.addr=127.0.0.1, rpc.method=SayHello, thread.id=16, net.sock.peer.port=64271, rpc
.system=grpc, thread.name=grpc-default-executor-0, rpc.grpc.status_code=0}, capac
ity=128, totalAddedValues=11}

2021-09-21 15:11:44,345 - werkzeug - INFO - \"\u001B[33mPOST /order HTTP/1.1\u001B[0m\" 404
2021-09-21 15:11:45,206 - root - INFO - Preparing espresso coffee
2021-09-21 15:11:46,269 - root - INFO - Get product price: cornetto 
2021-09-21 15:11:45,024 - werkzeug - INFO - \"OPTIONS /order HTTP/1.1\" 200
2021-09-21 15:11:45,246 - root - ERROR - Missing some ingredients
2021-09-21 15:11:46,270 - root - INFO - Query DB for price of product: cornetto
2021-09-21 15:11:45,074 - root - INFO - Check if tiramisu is available
2021-09-21 15:11:46,272 - root - ERROR - FATAL:  remaining connection slots are reserved
...

Resource resource = Resource.getDefault()
  .merge(Resource.create(Attributes.of(ResourceAttributes.SERVICE_NAME, "logical-service-name")));

SdkTracerProvider sdkTracerProvider = SdkTracerProvider.builder()
  .addSpanProcessor(BatchSpanProcessor.builder(OtlpGrpcSpanExporter.builder().build()).build())
  .setResource(resource)
  .build();

SdkMeterProvider sdkMeterProvider = SdkMeterProvider.builder()
  .registerMetricReader(PeriodicMetricReader.builder(OtlpGrpcMetricExporter.builder().build()).build())
  .setResource(resource)
  .build();

OpenTelemetry openTelemetry = OpenTelemetrySdk.builder()
  .setTracerProvider(sdkTracerProvider)
  .setMeterProvider(sdkMeterProvider)
  .setPropagators(ContextPropagators.create(W3CTraceContextPropagator.getInstance()))
  .buildAndRegisterGlobal();

<dependency>
    <groupId>io.opentelemetry</groupId>
    <artifactId>opentelemetry-sdk-extension-autoconfigure</artifactId>
</dependency>

OpenTelemetrySdk sdk = AutoConfiguredOpenTelemetrySdk.initialize()
    .getOpenTelemetrySdk();

OpenTelemetry openTelemetry = // obtain instance of OpenTelemetry

// Gets or creates a named meter instance
Meter meter = openTelemetry.meterBuilder("instrumentation-library-name")
        .setInstrumentationVersion("1.0.0")
        .build();

// Build counter e.g. LongCounter
LongCounter counter = meter
      .counterBuilder("processed_jobs")
      .setDescription("Processed jobs")
      .setUnit("1")
      .build();

// It is recommended that the API user keep a reference
// to Attributes they will record against
Attributes attributes = Attributes.of(stringKey("Key"), "SomeWork");

// Record data
counter.add(123, attributes);

Tracer tracer =
    openTelemetry.getTracer("instrumentation-library-name", "1.0.0");

Span span = tracer.spanBuilder("my span").startSpan();

// Make the span the current span
try (Scope ss = span.makeCurrent()) {
  // In this scope, the span is the current/active span
} finally {
    span.end();
}

$ java -javaagent:path/to/opentelemetry-javaagent.jar -jar myapp.jar

$ java \
  -Dotel.instrumentation.common.default-enabled=false \
  -Dotel.instrumentation.opentelemetry-api.enabled=true \
  -Dotel.instrumentation.opentelemetry-annotations.enabled=true \
  ...

import io.opentelemetry.instrumentation.annotations.SpanAttribute;
import io.opentelemetry.instrumentation.annotations.WithSpan;

public class MyClass {

    @WithSpan
    public void myMethod(@SpanAttribute("parameter1") String parameter1,
        @SpanAttribute("parameter2") long parameter2) {
        <...>
    }
}

import io.opentelemetry.api.trace.Span;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;


public class Controller {

  private static final Logger LOGGER = LogManager.getLogger(Controller.class);
  ...
  
  private void doWork(int sleepTime) throws InterruptedException {
    Span span = tracer.spanBuilder("doWork").startSpan();
    try (Scope ignored = span.makeCurrent()) {
      Thread.sleep(sleepTime);
      LOGGER.info("A sample log message!");
    } finally {
      span.end();
    }
  }
}

2022-09-27 19:58:02.931  INFO 6 --- [nio-8080-exec-1] i.o.example.javagent.Controller          : A sample log message!

2022-09-27T19:58:03.277Z	info	ResourceLog #0
Resource SchemaURL: https://opentelemetry.io/schemas/1.12.0
Resource labels:
     -> host.arch: STRING(aarch64)
     -> host: STRING(f566af917d1f)
     -> os.description: STRING(Linux 5.10.124-linuxkit)
     -> os.type: STRING(linux)
     -> process.command_line: STRING(/opt/java/openjdk:bin:java -javaagent:/opentelemetry-javaagent.jar)
     -> process.executable.path: STRING(/opt/java/openjdk:bin:java)
     -> process.pid: INT(6)
     -> process.runtime.description: STRING(Eclipse Adoptium OpenJDK 64-Bit Server VM 11.0.16.1+1)
     -> process.runtime.name: STRING(OpenJDK Runtime Environment)
     -> process.runtime.version: STRING(11.0.16.1+1)
     -> service: STRING(agent-example-app)
     -> telemetry.auto.version: STRING(1.17.0)
     -> telemetry.sdk.language: STRING(java)
     -> telemetry.sdk.name: STRING(opentelemetry)
     -> telemetry.sdk.version: STRING(1.17.0)
ScopeLogs #0
ScopeLogs SchemaURL:
InstrumentationScope io.opentelemetry.example.javagent.Controller
LogRecord #0
ObservedTimestamp: 1970-01-01 00:00:00 +0000 UTC
Timestamp: 1970-01-01 00:00:00 +0000 UTC
Severity: INFO
Body: A sample log message!
Trace ID: 6fe5dff61c1c88ad54e488083a24e787
Span ID: 59a214b6de1c6c13

2022-09-27 20:28:58.010 trace_id=67fe345ce6b6271c6ec2b47791c4b1e7 span_id=dfdf3f1559a75bc1 trace_flags=01  INFO 7 --- [nio-8080-exec-1] i.o.example.javagent.Controller          : A sample log message!

$ cat src/main/resources/application.properties
logging.pattern.level = trace_id=%mdc{trace_id} span_id=%mdc{span_id} trace_flags=%mdc{trace_flags} %5p

$ java \
  -javaagent:path/to/opentelemetry-javaagent.jar \
  -Dotel.javaagent.extensions=build/extension-1.0-all.jar \
  -jar myapp.jar

kubectl apply -f - <<EOF
apiVersion: opentelemetry.io/v1alpha1
kind: Instrumentation
metadata:
  name: my-instrumentation
spec:
  exporter:
    endpoint: http://otel-collector:4317
  propagators:
    - tracecontext
    - baggage
    - b3
  sampler:
    type: parentbased_traceidratio
    argument: "0.25"
EOF

instrumentation.opentelemetry.io/inject-java: "true"