profiler: add WithService

This change adds `WithService` to the tracer as an alias for
`WithServiceName` which now becomes marked as deprecated. It also
renames `WithServiceName` to `WithService` in the `profiler` package.

Additionally, these are added to the example, along with the version
tag.

ddtrace/tracer/option.go

@@ -159,8 +159,14 @@ func WithPropagator(p Propagator) StartOption {
 	}
 }
 
-// WithServiceName sets the default service name to be used with the tracer.
+// WithServiceName sets the default service name to be used with the tracer. It is
+// deprecated in favour of WithService and will be removed in the next major version.
 func WithServiceName(name string) StartOption {
+	return WithService(name)
+}
+
+// WithService sets the default service name to be used with the tracer.
+func WithService(name string) StartOption {
 	return func(c *config) {
 		c.serviceName = name
 	}

profiler/example_test.go

@@ -15,7 +15,9 @@ import (
 func Example() {
 	err := profiler.Start(
 		profiler.WithAPIKey("123key"),
+		profiler.WithService("users-db"),
 		profiler.WithEnv("staging"),
+		profiler.WithTags("version:1.2.0"),
 	)
 	if err != nil {
 		log.Fatal(err)

profiler/options.go

@@ -122,8 +122,8 @@ func WithProfileTypes(types ...ProfileType) Option {
 	}
 }
 
-// WithServiceName specifies the service name to attach a profile.
-func WithServiceName(name string) Option {
+// WithService specifies the service name to attach a profile.
+func WithService(name string) Option {
 	return func(cfg *config) {
 		cfg.service = name
 	}

profiler/upload_test.go

@@ -60,7 +60,7 @@ func TestTryUpload(t *testing.T) {
 	defer func(old *http.Client) { httpClient = old }(httpClient)
 	p := unstartedProfiler(
 		WithURL(srv.URL+"/"),
-		WithServiceName("my-service"),
+		WithService("my-service"),
 		WithEnv("my-env"),
 		WithTags("tag1:1", "tag2:2"),
 	)