commands: adds metrics associated with the debugger

Add metrics associated with the debugger that are reported through the
metrics writer. This adds a few attributes that are only added when a
debugger is used with either the `debug` command or `dap` command.

At the moment, these metrics show up the exact same as a build and we
can't identify if something is using `dap` or `debug` since they use the
same code path.

This also adds a new available metric that can be utilized by plugins to
report additional information. The metrics will check if an environment
variable `BUILDX_DAP_USER_AGENT` is sent and that will get included in
the metrics if they are enabled.

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

commands/build.go

@@ -239,10 +239,12 @@ const (
 	commandOptionsHash   = attribute.Key("command.options.hash")
 	driverNameAttribute  = attribute.Key("driver.name")
 	driverTypeAttribute  = attribute.Key("driver.type")
+	debuggerName         = attribute.Key("debugger.name")
+	debuggerUserAgent    = attribute.Key("debugger.user.agent")
 )
 
-func buildMetricAttributes(dockerCli command.Cli, driverType string, options *buildOptions) attribute.Set {
-	return attribute.NewSet(
+func buildMetricAttributes(dockerCli command.Cli, driverType string, options *buildOptions, debugger debuggerOptions) attribute.Set {
+	kvs := []attribute.KeyValue{
 		commandNameAttribute.String("build"),
 		attribute.Stringer(string(commandOptionsHash), &buildOptionsHash{
 			buildOptions: options,
@@ -250,7 +252,16 @@ func buildMetricAttributes(dockerCli command.Cli, driverType string, options *bu
 		}),
 		driverNameAttribute.String(options.builder),
 		driverTypeAttribute.String(driverType),
-	)
+	}
+
+	if debugger != nil {
+		d := debugger.Info()
+		kvs = append(kvs,
+			debuggerName.String(d.Name),
+			debuggerUserAgent.String(d.UserAgent),
+		)
+	}
+	return attribute.NewSet(kvs...)
 }
 
 // buildOptionsHash computes a hash for the buildOptions when the String method is invoked.
@@ -331,7 +342,7 @@ func runBuild(ctx context.Context, dockerCli command.Cli, debugOpts debuggerOpti
 	}
 	driverType := b.Driver
 
-	attributes := buildMetricAttributes(dockerCli, driverType, &options)
+	attributes := buildMetricAttributes(dockerCli, driverType, &options, debugOpts)
 
 	ctx2, cancel := context.WithCancelCause(context.TODO())
 	defer func() { cancel(errors.WithStack(context.Canceled)) }()

commands/dap.go

@@ -18,6 +18,10 @@ import (
 	"github.com/spf13/cobra"
 )
 
+const (
+	dapEnvUserAgent = "BUILDX_DAP_USER_AGENT"
+)
+
 func dapCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 	var options dapOptions
 	cmd := &cobra.Command{
@@ -51,6 +55,13 @@ func (d *dapOptions) New(in ioset.In) (debuggerInstance, error) {
 	}, nil
 }
 
+func (d *dapOptions) Info() debuggerInfo {
+	return debuggerInfo{
+		Name:      "dap",
+		UserAgent: os.Getenv(dapEnvUserAgent),
+	}
+}
+
 type LaunchConfig struct {
 	Dockerfile  string `json:"dockerfile,omitempty"`
 	ContextPath string `json:"contextPath,omitempty"`

commands/debug.go

@@ -26,9 +26,15 @@ type debugOptions struct {
 	OnFlag string
 }
 
+type debuggerInfo struct {
+	Name      string
+	UserAgent string
+}
+
 // debuggerOptions will start a debuggerOptions instance.
 type debuggerOptions interface {
 	New(in ioset.In) (debuggerInstance, error)
+	Info() debuggerInfo
 }
 
 // debuggerInstance is an instance of a Debugger that has been started.
@@ -71,6 +77,12 @@ func (d *debugOptions) New(in ioset.In) (debuggerInstance, error) {
 	}, nil
 }
 
+func (d *debugOptions) Info() debuggerInfo {
+	return debuggerInfo{
+		Name: "debug",
+	}
+}
+
 type monitorDebuggerInstance struct {
 	cfg *build.InvokeConfig
 	in  io.ReadCloser