Automatic span creation

ttrpc interceptor automatically formats (as JSON) and adds
server requests and responses as span attributes.

Host and guest bridge automatically creates spans for RPCs.

Replaced redundant `cmd/containerd-shim-runhcs-v1/service.go.(Service)`
`internal/gcs`, and `interna\guest\bridge` spans with `.Trace` log
entries, since they include
all the same (or less) information as those automatically generated by
the ttrp interceptor and `(*bridge).RPC`

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

cmd/containerd-shim-runhcs-v1/serve.go

@@ -20,13 +20,15 @@ import (
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
+	"go.opencensus.io/trace"
 	"golang.org/x/sys/windows"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/anypb"
 
 	runhcsopts "github.com/Microsoft/hcsshim/cmd/containerd-shim-runhcs-v1/options"
 	"github.com/Microsoft/hcsshim/internal/extendedtask"
 	hcslog "github.com/Microsoft/hcsshim/internal/log"
+	"github.com/Microsoft/hcsshim/internal/logfields"
 	"github.com/Microsoft/hcsshim/internal/shimdiag"
 	"github.com/Microsoft/hcsshim/pkg/octtrpc"
 )
@@ -194,7 +196,13 @@ var serveCommand = cli.Command{
 			return fmt.Errorf("failed to create new service: %w", err)
 		}
 
-		s, err := ttrpc.NewServer(ttrpc.WithUnaryServerInterceptor(octtrpc.ServerInterceptor()))
+		s, err := ttrpc.NewServer(
+			ttrpc.WithUnaryServerInterceptor(octtrpc.ServerInterceptor(
+				octtrpc.WithAttributes( // todo (helsaawy) set these in resource when we switch to OTel
+					trace.StringAttribute(logfields.ShimID, svc.tid),
+					trace.BoolAttribute(logfields.IsSandbox, svc.isSandbox),
+				),
+			)))
 		if err != nil {
 			return err
 		}