diff --git a/agent/vendor/github.com/aws/amazon-ecs-agent/ecs-agent/acs/session/session.go b/agent/vendor/github.com/aws/amazon-ecs-agent/ecs-agent/acs/session/session.go
index 6a3f733cf99..04f0ecc36dc 100644
--- a/agent/vendor/github.com/aws/amazon-ecs-agent/ecs-agent/acs/session/session.go
+++ b/agent/vendor/github.com/aws/amazon-ecs-agent/ecs-agent/acs/session/session.go
@@ -99,6 +99,8 @@ type session struct {
 	disconnectJitter               time.Duration
 	inactiveInstanceReconnectDelay time.Duration
 	lastConnectedTime              time.Time
+	firstACSConnectionTime         time.Time
+	firstDiscoverPollEndpointTime  time.Time
 }
 
 // NewSession creates a new Session.
@@ -158,6 +160,8 @@ func NewSession(containerInstanceARN string,
 		disconnectJitter:               wsclient.DisconnectJitterMax,
 		inactiveInstanceReconnectDelay: inactiveInstanceReconnectDelay,
 		lastConnectedTime:              time.Time{},
+		firstACSConnectionTime:         time.Time{},
+		firstDiscoverPollEndpointTime:  time.Time{},
 	}
 }
 
@@ -234,7 +238,14 @@ func (s *session) Start(ctx context.Context) error {
 // startSessionOnce creates a session with ACS and handles requests using the passed
 // in arguments.
 func (s *session) startSessionOnce(ctx context.Context) error {
+	if s.GetFirstDiscoverPollEndpointTime().IsZero() {
+		s.firstDiscoverPollEndpointTime = time.Now()
+	}
+
+	discoverPollEndpointMetric := s.metricsFactory.New(metrics.ACSDiscoverPollEndpointDurationName)
 	acsEndpoint, err := s.ecsClient.DiscoverPollEndpoint(s.containerInstanceARN)
+	discoverPollEndpointMetric.Done(err)
+
 	if err != nil {
 		logger.Error("ACS: Unable to discover poll endpoint", logger.Fields{
 			"containerInstanceARN": s.containerInstanceARN,
@@ -253,6 +264,7 @@ func (s *session) startSessionOnce(ctx context.Context) error {
 
 	// Invoke Connect method as soon as we create client. This will ensure all the
 	// request handlers to be associated with this client have a valid connection.
+	acsConnectionMetric := s.metricsFactory.New(metrics.ACSConnectionMetricDurationName)
 	disconnectTimer, err := client.Connect(metrics.ACSDisconnectTimeoutMetricName, s.disconnectTimeout,
 		s.disconnectJitter)
 	if err != nil {
@@ -262,8 +274,13 @@ func (s *session) startSessionOnce(ctx context.Context) error {
 		})
 		return err
 	}
+	acsConnectionMetric.Done(err)
 	defer disconnectTimer.Stop()
 
+	if s.GetFirstACSConnectionTime().IsZero() {
+		s.firstACSConnectionTime = time.Now()
+	}
+
 	// Record the timestamp of the last connection to ACS.
 	s.lastConnectedTime = time.Now()
 
@@ -475,3 +492,11 @@ func formatDockerVersion(dockerVersionValue string) string {
 func (s *session) GetLastConnectedTime() time.Time {
 	return s.lastConnectedTime
 }
+
+func (s *session) GetFirstACSConnectionTime() time.Time {
+	return s.firstACSConnectionTime
+}
+
+func (s *session) GetFirstDiscoverPollEndpointTime() time.Time {
+	return s.firstDiscoverPollEndpointTime
+}
diff --git a/agent/vendor/github.com/aws/amazon-ecs-agent/ecs-agent/metrics/constants.go b/agent/vendor/github.com/aws/amazon-ecs-agent/ecs-agent/metrics/constants.go
index 9537a58fd7a..021dacd944a 100644
--- a/agent/vendor/github.com/aws/amazon-ecs-agent/ecs-agent/metrics/constants.go
+++ b/agent/vendor/github.com/aws/amazon-ecs-agent/ecs-agent/metrics/constants.go
@@ -46,6 +46,11 @@ const (
 	ACSDisconnectTimeoutMetricName = agentAvailabilityNamespace + ".ACSDisconnectTimeout"
 	TCSDisconnectTimeoutMetricName = agentAvailabilityNamespace + ".TCSDisconnectTimeout"
 
+	// ACS Session Metrics
+	acsStartSessionNamespace            = "ACSStartSession"
+	ACSDiscoverPollEndpointDurationName = acsStartSessionNamespace + ".DiscoverPollEndpointDuration"
+	ACSConnectionMetricDurationName     = acsStartSessionNamespace + ".ACSConnectEndpointDuration"
+
 	dbClientMetricNamespace                 = "Data"
 	GetNetworkConfigurationByTaskMetricName = dbClientMetricNamespace + ".GetNetworkConfigurationByTask"
 	SaveNetworkNamespaceMetricName          = dbClientMetricNamespace + ".SaveNetworkNamespace"