Update basic-otlp example to show how to set service name (open-telemetry#745)

Author: k4ji

examples/basic-otlp/Cargo.toml

@@ -9,5 +9,6 @@ futures-util = { version = "0.3", default-features = false, features = ["std"] }
 lazy_static = "1.4"
 opentelemetry = { path = "../../opentelemetry", features = ["rt-tokio", "metrics"] }
 opentelemetry-otlp = { path = "../../opentelemetry-otlp", features = ["tonic", "metrics"] }
+opentelemetry-semantic-conventions = { path = "../../opentelemetry-semantic-conventions" }
 serde_json = "1.0"
 tokio = { version = "1.0", features = ["full"] }

examples/basic-otlp/README.md

@@ -20,47 +20,47 @@ You should be able to see something similar below with different time and ID in
 
 ```
 Resource labels:
-     -> service.name: STRING(unknown_service)
+     -> service.name: STRING(trace-demo)
 InstrumentationLibrarySpans #0
 InstrumentationLibrary
 Span #0
-    Trace ID       : e60184475358d966b0880ec1cc1cf515
-    Parent ID      : 7b74443b55e404ba
-    ID             : f8e4a037c0fa63bd
+    Trace ID       : 737d9c966e8250475f400776228c0044
+    Parent ID      : ade62a071825f2db
+    ID             : 7aa9ea5f24e0444c
     Name           : Sub operation...
     Kind           : SPAN_KIND_INTERNAL
-    Start time     : 2021-11-19 04:07:46.29597 +0000 UTC
-    End time       : 2021-11-19 04:07:46.295997 +0000 UTC
+    Start time     : 2022-02-24 04:59:57.218995 +0000 UTC
+    End time       : 2022-02-24 04:59:57.219022 +0000 UTC
     Status code    : STATUS_CODE_UNSET
     Status message :
 Attributes:
      -> lemons: STRING(five)
 Events:
 SpanEvent #0
      -> Name: Sub span event
-     -> Timestamp: 2021-11-19 04:07:46.295982 +0000 UTC
+     -> Timestamp: 2022-02-24 04:59:57.219012 +0000 UTC
      -> DroppedAttributesCount: 0
 ResourceSpans #1
 Resource labels:
-     -> service.name: STRING(unknown_service)
+     -> service.name: STRING(trace-demo)
 InstrumentationLibrarySpans #0
 InstrumentationLibrary
 Span #0
-    Trace ID       : e60184475358d966b0880ec1cc1cf515
+    Trace ID       : 737d9c966e8250475f400776228c0044
     Parent ID      :
-    ID             : 7b74443b55e404ba
+    ID             : ade62a071825f2db
     Name           : operation
     Kind           : SPAN_KIND_INTERNAL
-    Start time     : 2021-11-19 04:07:46.295898 +0000 UTC
-    End time       : 2021-11-19 04:07:46.296015 +0000 UTC
+    Start time     : 2022-02-24 04:59:57.218877 +0000 UTC
+    End time       : 2022-02-24 04:59:57.219043 +0000 UTC
     Status code    : STATUS_CODE_UNSET
     Status message :
 Attributes:
      -> ex.com/another: STRING(yes)
 Events:
 SpanEvent #0
      -> Name: Nice operation!
-     -> Timestamp: 2021-11-19 04:07:46.295915 +0000 UTC
+     -> Timestamp: 2022-02-24 04:59:57.218896 +0000 UTC
      -> DroppedAttributesCount: 0
      -> Attributes:
          -> bogons: INT(100)

examples/basic-otlp/src/main.rs

@@ -1,6 +1,7 @@
 use futures_util::{Stream, StreamExt as _};
 use opentelemetry::global::shutdown_tracer_provider;
 use opentelemetry::sdk::metrics::{selectors, PushController};
+use opentelemetry::sdk::Resource;
 use opentelemetry::trace::TraceError;
 use opentelemetry::{
     baggage::BaggageExt,
@@ -21,6 +22,12 @@ fn init_tracer() -> Result<sdktrace::Tracer, TraceError> {
                 .tonic()
                 .with_endpoint("http://localhost:4317"),
         )
+        .with_trace_config(
+            sdktrace::config().with_resource(Resource::new(vec![KeyValue::new(
+                opentelemetry_semantic_conventions::resource::SERVICE_NAME,
+                "trace-demo",
+            )])),
+        )
         .install_batch(opentelemetry::runtime::Tokio)
 }