Debug Logging for sdk/trace (#2500)

* Debug Logging for sdk/trace

* Fixes spelling, adds marshaling to attribute sets

Co-authored-by: Aaron Clawson <MadVikingGod@users.noreply.github.com>
Co-authored-by: Anthony Mirabella <a9@aneurysm9.com>

sdk/trace/provider.go

@@ -21,6 +21,7 @@ import (
 	"sync/atomic"
 
 	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/internal/global"
 	"go.opentelemetry.io/otel/sdk/instrumentation"
 	"go.opentelemetry.io/otel/sdk/resource"
 	"go.opentelemetry.io/otel/trace"
@@ -52,6 +53,23 @@ type tracerProviderConfig struct {
 	resource *resource.Resource
 }
 
+// MarshalLog is the marshaling function used by the logging system to represent this exporter.
+func (cfg tracerProviderConfig) MarshalLog() interface{} {
+	return struct {
+		SpanProcessors  []SpanProcessor
+		SamplerType     string
+		IDGeneratorType string
+		SpanLimits      SpanLimits
+		Resource        *resource.Resource
+	}{
+		SpanProcessors:  cfg.processors,
+		SamplerType:     fmt.Sprintf("%T", cfg.sampler),
+		IDGeneratorType: fmt.Sprintf("%T", cfg.idGenerator),
+		SpanLimits:      cfg.spanLimits,
+		Resource:        cfg.resource,
+	}
+}
+
 type TracerProvider struct {
 	mu             sync.Mutex
 	namedTracer    map[instrumentation.Library]*tracer
@@ -91,6 +109,8 @@ func NewTracerProvider(opts ...TracerProviderOption) *TracerProvider {
 		resource:    o.resource,
 	}
 
+	global.Info("TracerProvider created", "config", o)
+
 	for _, sp := range o.processors {
 		tp.RegisterSpanProcessor(sp)
 	}
@@ -125,6 +145,7 @@ func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 			instrumentationLibrary: il,
 		}
 		p.namedTracer[il] = t
+		global.Info("Tracer created", "name", name, "version", c.InstrumentationVersion(), "schemaURL", c.SchemaURL())
 	}
 	return t
 }