metricutil: switch to using the cli meter provider

The meter provider initialization that was located here has now been
moved to a common area in the docker cli. This upgrades our CLI version
and then uses this common code instead of our own version.

As a piece of additional functionality, the docker OTEL endpoint can now
be overwritten with `DOCKER_CLI_OTEL_EXPORTER_OTLP_ENDPOINT` for
testing.

This removes the OTLP exporter from the CLI that was previously locked
behind `BUILDX_EXPERIMENTAL`. I do plan for this to return, but as a
proper part of the `docker/cli` implementation rather than something
special with `buildx`.

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

vendor/github.com/docker/cli/cli/command/cli.go

@@ -65,6 +65,7 @@ type Cli interface {
 	ContextStore() store.Store
 	CurrentContext() string
 	DockerEndpoint() docker.Endpoint
+	TelemetryClient
 }
 
 // DockerCli is an instance the docker command line client.
@@ -85,6 +86,7 @@ type DockerCli struct {
 	dockerEndpoint     docker.Endpoint
 	contextStoreConfig store.Config
 	initTimeout        time.Duration
+	res                telemetryResource
 
 	// baseCtx is the base context used for internal operations. In the future
 	// this may be replaced by explicitly passing a context to functions that
@@ -187,6 +189,36 @@ func (cli *DockerCli) BuildKitEnabled() (bool, error) {
 	return cli.ServerInfo().OSType != "windows", nil
 }
 
+// HooksEnabled returns whether plugin hooks are enabled.
+func (cli *DockerCli) HooksEnabled() bool {
+	// legacy support DOCKER_CLI_HINTS env var
+	if v := os.Getenv("DOCKER_CLI_HINTS"); v != "" {
+		enabled, err := strconv.ParseBool(v)
+		if err != nil {
+			return false
+		}
+		return enabled
+	}
+	// use DOCKER_CLI_HOOKS env var value if set and not empty
+	if v := os.Getenv("DOCKER_CLI_HOOKS"); v != "" {
+		enabled, err := strconv.ParseBool(v)
+		if err != nil {
+			return false
+		}
+		return enabled
+	}
+	featuresMap := cli.ConfigFile().Features
+	if v, ok := featuresMap["hooks"]; ok {
+		enabled, err := strconv.ParseBool(v)
+		if err != nil {
+			return false
+		}
+		return enabled
+	}
+	// default to false
+	return false
+}
+
 // ManifestStore returns a store for local manifests
 func (cli *DockerCli) ManifestStore() manifeststore.Store {
 	// TODO: support override default location from config file