feat(ingress gateway: support configuring limits in ingress-gateway c… (#14749)

* feat(ingress gateway: support configuring limits in ingress-gateway config entry

- a new Defaults field with max_connections, max_pending_connections, max_requests
  is added to ingress gateway config entry
- new field max_connections, max_pending_connections, max_requests in
  individual services to overwrite the value in Default
- added unit test and integration test
- updated doc

Co-authored-by: Chris S. Kim <ckim@hashicorp.com>
Co-authored-by: Jeff Boruszak <104028618+boruszak@users.noreply.github.com>
Co-authored-by: Dan Stough <dan.stough@hashicorp.com>

.changelog/14749.txt

@@ -0,0 +1,3 @@
+```release-note:feature
+config-entry(ingress-gateway): Added support for `max_connections` for upstream clusters
+```

agent/proxycfg/ingress_gateway.go

@@ -98,6 +98,9 @@ func (s *handlerIngressGateway) handleUpdate(ctx context.Context, u UpdateEvent,
 
 		snap.IngressGateway.GatewayConfigLoaded = true
 		snap.IngressGateway.TLSConfig = gatewayConf.TLS
+		if gatewayConf.Defaults != nil {
+			snap.IngressGateway.Defaults = *gatewayConf.Defaults
+		}
 
 		// Load each listener's config from the config entry so we don't have to
 		// pass listener config through "upstreams" types as that grows.

agent/proxycfg/snapshot.go

@@ -619,6 +619,9 @@ type configSnapshotIngressGateway struct {
 	// Listeners is the original listener config from the ingress-gateway config
 	// entry to save us trying to pass fields through Upstreams
 	Listeners map[IngressListenerKey]structs.IngressListener
+
+	// Defaults is the default configuration for upstream service instances
+	Defaults structs.IngressServiceConfig
 }
 
 // isEmpty is a test helper

agent/structs/config_entry_gateways.go

@@ -31,11 +31,20 @@ type IngressGatewayConfigEntry struct {
 	// what services to associated to those ports.
 	Listeners []IngressListener
 
+	// Defaults contains default configuration for all upstream service instances
+	Defaults *IngressServiceConfig `json:",omitempty"`
+
 	Meta               map[string]string `json:",omitempty"`
 	acl.EnterpriseMeta `hcl:",squash" mapstructure:",squash"`
 	RaftIndex
 }
 
+type IngressServiceConfig struct {
+	MaxConnections        uint32
+	MaxPendingRequests    uint32
+	MaxConcurrentRequests uint32
+}
+
 type IngressListener struct {
 	// Port declares the port on which the ingress gateway should listen for traffic.
 	Port int
@@ -90,6 +99,10 @@ type IngressService struct {
 	RequestHeaders  *HTTPHeaderModifiers `json:",omitempty" alias:"request_headers"`
 	ResponseHeaders *HTTPHeaderModifiers `json:",omitempty" alias:"response_headers"`
 
+	MaxConnections        uint32 `json:",omitempty" alias:"max_connections"`
+	MaxPendingRequests    uint32 `json:",omitempty" alias:"max_pending_requests"`
+	MaxConcurrentRequests uint32 `json:",omitempty" alias:"max_concurrent_requests"`
+
 	Meta               map[string]string `json:",omitempty"`
 	acl.EnterpriseMeta `hcl:",squash" mapstructure:",squash"`
 }

agent/xds/clusters.go

@@ -630,7 +630,7 @@ func (s *ResourceGenerator) injectGatewayDestinationAddons(cfgSnap *proxycfg.Con
 func (s *ResourceGenerator) clustersFromSnapshotIngressGateway(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
 	var clusters []proto.Message
 	createdClusters := make(map[proxycfg.UpstreamID]bool)
-	for _, upstreams := range cfgSnap.IngressGateway.Upstreams {
+	for listenerKey, upstreams := range cfgSnap.IngressGateway.Upstreams {
 		for _, u := range upstreams {
 			uid := proxycfg.NewUpstreamID(&u)
 
@@ -658,6 +658,7 @@ func (s *ResourceGenerator) clustersFromSnapshotIngressGateway(cfgSnap *proxycfg
 			}
 
 			for _, c := range upstreamClusters {
+				s.configIngressUpstreamCluster(c, cfgSnap, listenerKey, &u)
 				clusters = append(clusters, c)
 			}
 			createdClusters[uid] = true
@@ -666,6 +667,50 @@ func (s *ResourceGenerator) clustersFromSnapshotIngressGateway(cfgSnap *proxycfg
 	return clusters, nil
 }
 
+func (s *ResourceGenerator) configIngressUpstreamCluster(c *envoy_cluster_v3.Cluster, cfgSnap *proxycfg.ConfigSnapshot, listenerKey proxycfg.IngressListenerKey, u *structs.Upstream) {
+	var threshold *envoy_cluster_v3.CircuitBreakers_Thresholds
+	setThresholdLimit := func(limitType string, limit int) {
+		if limit <= 0 {
+			return
+		}
+
+		if threshold == nil {
+			threshold = &envoy_cluster_v3.CircuitBreakers_Thresholds{}
+		}
+
+		switch limitType {
+		case "max_connections":
+			threshold.MaxConnections = makeUint32Value(limit)
+		case "max_pending_requests":
+			threshold.MaxPendingRequests = makeUint32Value(limit)
+		case "max_requests":
+			threshold.MaxRequests = makeUint32Value(limit)
+		}
+	}
+
+	setThresholdLimit("max_connections", int(cfgSnap.IngressGateway.Defaults.MaxConnections))
+	setThresholdLimit("max_pending_requests", int(cfgSnap.IngressGateway.Defaults.MaxPendingRequests))
+	setThresholdLimit("max_requests", int(cfgSnap.IngressGateway.Defaults.MaxConcurrentRequests))
+
+	// Adjust the limit for upstream service
+	// Lookup listener and service config details from ingress gateway
+	// definition.
+	var svc *structs.IngressService
+	if lCfg, ok := cfgSnap.IngressGateway.Listeners[listenerKey]; ok {
+		svc = findIngressServiceMatchingUpstream(lCfg, *u)
+	}
+
+	if svc != nil {
+		setThresholdLimit("max_connections", int(svc.MaxConnections))
+		setThresholdLimit("max_pending_requests", int(svc.MaxPendingRequests))
+		setThresholdLimit("max_requests", int(svc.MaxConcurrentRequests))
+	}
+
+	if threshold != nil {
+		c.CircuitBreakers.Thresholds = []*envoy_cluster_v3.CircuitBreakers_Thresholds{threshold}
+	}
+}
+
 func (s *ResourceGenerator) makeAppCluster(cfgSnap *proxycfg.ConfigSnapshot, name, pathProtocol string, port int) (*envoy_cluster_v3.Cluster, error) {
 	var c *envoy_cluster_v3.Cluster
 	var err error

agent/xds/clusters_test.go

@@ -493,6 +493,45 @@ func TestClustersFromSnapshot(t *testing.T) {
 					"simple", nil, nil, nil)
 			},
 		},
+		{
+			name: "ingress-with-service-max-connections",
+			create: func(t testinf.T) *proxycfg.ConfigSnapshot {
+				return proxycfg.TestConfigSnapshotIngressGateway(t, true, "tcp",
+					"simple", nil,
+					func(entry *structs.IngressGatewayConfigEntry) {
+						entry.Listeners[0].Services[0].MaxConnections = 4096
+					}, nil)
+			},
+		},
+		{
+			name: "ingress-with-defaults-service-max-connections",
+			create: func(t testinf.T) *proxycfg.ConfigSnapshot {
+				return proxycfg.TestConfigSnapshotIngressGateway(t, true, "tcp",
+					"simple", nil,
+					func(entry *structs.IngressGatewayConfigEntry) {
+						entry.Defaults = &structs.IngressServiceConfig{
+							MaxConnections:        2048,
+							MaxPendingRequests:    512,
+							MaxConcurrentRequests: 4096,
+						}
+					}, nil)
+			},
+		},
+		{
+			name: "ingress-with-overwrite-defaults-service-max-connections",
+			create: func(t testinf.T) *proxycfg.ConfigSnapshot {
+				return proxycfg.TestConfigSnapshotIngressGateway(t, true, "tcp",
+					"simple", nil,
+					func(entry *structs.IngressGatewayConfigEntry) {
+						entry.Defaults = &structs.IngressServiceConfig{
+							MaxConnections:     2048,
+							MaxPendingRequests: 512,
+						}
+						entry.Listeners[0].Services[0].MaxConnections = 4096
+						entry.Listeners[0].Services[0].MaxPendingRequests = 2048
+					}, nil)
+			},
+		},
 		{
 			name: "ingress-with-chain-external-sni",
 			create: func(t testinf.T) *proxycfg.ConfigSnapshot {

agent/xds/testdata/clusters/ingress-with-defaults-service-max-connections.latest.golden

@@ -0,0 +1,71 @@
+{
+  "versionInfo": "00000001",
+  "resources": [
+    {
+      "@type": "type.googleapis.com/envoy.config.cluster.v3.Cluster",
+      "name": "db.default.dc1.internal.11111111-2222-3333-4444-555555555555.consul",
+      "altStatName": "db.default.dc1.internal.11111111-2222-3333-4444-555555555555.consul",
+      "type": "EDS",
+      "edsClusterConfig": {
+        "edsConfig": {
+          "ads": {
+
+          },
+          "resourceApiVersion": "V3"
+        }
+      },
+      "connectTimeout": "33s",
+      "circuitBreakers": {
+        "thresholds":[
+          {
+            "maxConnections": 2048,
+            "maxPendingRequests": 512,
+            "maxRequests": 4096
+          }
+        ]
+      },
+      "outlierDetection": {
+
+      },
+      "commonLbConfig": {
+        "healthyPanicThreshold": {
+
+        }
+      },
+      "transportSocket": {
+        "name": "tls",
+        "typedConfig": {
+          "@type": "type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.UpstreamTlsContext",
+          "commonTlsContext": {
+            "tlsParams": {
+
+            },
+            "tlsCertificates": [
+              {
+                "certificateChain": {
+                  "inlineString": "-----BEGIN CERTIFICATE-----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\npY0heYeK9A6iOLrzqxSerkXXQyj5e9bE4VgUnxgPU6g=\n-----END CERTIFICATE-----\n"
+                },
+                "privateKey": {
+                  "inlineString": "-----BEGIN EC PRIVATE KEY-----\nMHcCAQEEIMoTkpRggp3fqZzFKh82yS4LjtJI+XY+qX/7DefHFrtdoAoGCCqGSM49\nAwEHoUQDQgAEADPv1RHVNRfa2VKRAB16b6rZnEt7tuhaxCFpQXPj7M2omb0B9Fav\nq5E0ivpNtv1QnFhxtPd7d5k4e+T7SkW1TQ==\n-----END EC PRIVATE KEY-----\n"
+                }
+              }
+            ],
+            "validationContext": {
+              "trustedCa": {
+                "inlineString": "-----BEGIN CERTIFICATE-----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\noR5f6Ku+cig2Il8T8LJujOp2/2A72QcHZA57B13y+8o=\n-----END CERTIFICATE-----\n"
+              },
+              "matchSubjectAltNames": [
+                {
+                  "exact": "spiffe://11111111-2222-3333-4444-555555555555.consul/ns/default/dc/dc1/svc/db"
+                }
+              ]
+            }
+          },
+          "sni": "db.default.dc1.internal.11111111-2222-3333-4444-555555555555.consul"
+        }
+      }
+    }
+  ],
+  "typeUrl": "type.googleapis.com/envoy.config.cluster.v3.Cluster",
+  "nonce": "00000001"
+}

agent/xds/testdata/clusters/ingress-with-overwrite-defaults-service-max-connections.latest.golden

@@ -0,0 +1,70 @@
+{
+  "versionInfo": "00000001",
+  "resources": [
+    {
+      "@type": "type.googleapis.com/envoy.config.cluster.v3.Cluster",
+      "name": "db.default.dc1.internal.11111111-2222-3333-4444-555555555555.consul",
+      "altStatName": "db.default.dc1.internal.11111111-2222-3333-4444-555555555555.consul",
+      "type": "EDS",
+      "edsClusterConfig": {
+        "edsConfig": {
+          "ads": {
+
+          },
+          "resourceApiVersion": "V3"
+        }
+      },
+      "connectTimeout": "33s",
+      "circuitBreakers": {
+        "thresholds":[
+          {
+            "maxConnections": 4096,
+            "maxPendingRequests": 2048
+          }
+        ]
+      },
+      "outlierDetection": {
+
+      },
+      "commonLbConfig": {
+        "healthyPanicThreshold": {
+
+        }
+      },
+      "transportSocket": {
+        "name": "tls",
+        "typedConfig": {
+          "@type": "type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.UpstreamTlsContext",
+          "commonTlsContext": {
+            "tlsParams": {
+
+            },
+            "tlsCertificates": [
+              {
+                "certificateChain": {
+                  "inlineString": "-----BEGIN CERTIFICATE-----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\npY0heYeK9A6iOLrzqxSerkXXQyj5e9bE4VgUnxgPU6g=\n-----END CERTIFICATE-----\n"
+                },
+                "privateKey": {
+                  "inlineString": "-----BEGIN EC PRIVATE KEY-----\nMHcCAQEEIMoTkpRggp3fqZzFKh82yS4LjtJI+XY+qX/7DefHFrtdoAoGCCqGSM49\nAwEHoUQDQgAEADPv1RHVNRfa2VKRAB16b6rZnEt7tuhaxCFpQXPj7M2omb0B9Fav\nq5E0ivpNtv1QnFhxtPd7d5k4e+T7SkW1TQ==\n-----END EC PRIVATE KEY-----\n"
+                }
+              }
+            ],
+            "validationContext": {
+              "trustedCa": {
+                "inlineString": "-----BEGIN CERTIFICATE-----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\noR5f6Ku+cig2Il8T8LJujOp2/2A72QcHZA57B13y+8o=\n-----END CERTIFICATE-----\n"
+              },
+              "matchSubjectAltNames": [
+                {
+                  "exact": "spiffe://11111111-2222-3333-4444-555555555555.consul/ns/default/dc/dc1/svc/db"
+                }
+              ]
+            }
+          },
+          "sni": "db.default.dc1.internal.11111111-2222-3333-4444-555555555555.consul"
+        }
+      }
+    }
+  ],
+  "typeUrl": "type.googleapis.com/envoy.config.cluster.v3.Cluster",
+  "nonce": "00000001"
+}

agent/xds/testdata/clusters/ingress-with-service-max-connections.latest.golden

@@ -0,0 +1,69 @@
+{
+  "versionInfo": "00000001",
+  "resources": [
+    {
+      "@type": "type.googleapis.com/envoy.config.cluster.v3.Cluster",
+      "name": "db.default.dc1.internal.11111111-2222-3333-4444-555555555555.consul",
+      "altStatName": "db.default.dc1.internal.11111111-2222-3333-4444-555555555555.consul",
+      "type": "EDS",
+      "edsClusterConfig": {
+        "edsConfig": {
+          "ads": {
+
+          },
+          "resourceApiVersion": "V3"
+        }
+      },
+      "connectTimeout": "33s",
+      "circuitBreakers": {
+        "thresholds":[
+          {
+            "maxConnections": 4096
+          }
+        ]
+      },
+      "outlierDetection": {
+
+      },
+      "commonLbConfig": {
+        "healthyPanicThreshold": {
+
+        }
+      },
+      "transportSocket": {
+        "name": "tls",
+        "typedConfig": {
+          "@type": "type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.UpstreamTlsContext",
+          "commonTlsContext": {
+            "tlsParams": {
+
+            },
+            "tlsCertificates": [
+              {
+                "certificateChain": {
+                  "inlineString": "-----BEGIN CERTIFICATE-----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\npY0heYeK9A6iOLrzqxSerkXXQyj5e9bE4VgUnxgPU6g=\n-----END CERTIFICATE-----\n"
+                },
+                "privateKey": {
+                  "inlineString": "-----BEGIN EC PRIVATE KEY-----\nMHcCAQEEIMoTkpRggp3fqZzFKh82yS4LjtJI+XY+qX/7DefHFrtdoAoGCCqGSM49\nAwEHoUQDQgAEADPv1RHVNRfa2VKRAB16b6rZnEt7tuhaxCFpQXPj7M2omb0B9Fav\nq5E0ivpNtv1QnFhxtPd7d5k4e+T7SkW1TQ==\n-----END EC PRIVATE KEY-----\n"
+                }
+              }
+            ],
+            "validationContext": {
+              "trustedCa": {
+                "inlineString": "-----BEGIN CERTIFICATE-----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\noR5f6Ku+cig2Il8T8LJujOp2/2A72QcHZA57B13y+8o=\n-----END CERTIFICATE-----\n"
+              },
+              "matchSubjectAltNames": [
+                {
+                  "exact": "spiffe://11111111-2222-3333-4444-555555555555.consul/ns/default/dc/dc1/svc/db"
+                }
+              ]
+            }
+          },
+          "sni": "db.default.dc1.internal.11111111-2222-3333-4444-555555555555.consul"
+        }
+      }
+    }
+  ],
+  "typeUrl": "type.googleapis.com/envoy.config.cluster.v3.Cluster",
+  "nonce": "00000001"
+}

api/config_entry_gateways.go

@@ -27,6 +27,9 @@ type IngressGatewayConfigEntry struct {
 
 	Meta map[string]string `json:",omitempty"`
 
+	// Defaults is default configuration for all upstream services
+	Defaults *IngressServiceConfig `json:",omitempty"`
+
 	// CreateIndex is the Raft index this entry was created at. This is a
 	// read-only field.
 	CreateIndex uint64
@@ -37,6 +40,12 @@ type IngressGatewayConfigEntry struct {
 	ModifyIndex uint64
 }
 
+type IngressServiceConfig struct {
+	MaxConnections        *uint32
+	MaxPendingRequests    *uint32
+	MaxConcurrentRequests *uint32
+}
+
 type GatewayTLSConfig struct {
 	// Indicates that TLS should be enabled for this gateway service.
 	Enabled bool
@@ -124,6 +133,10 @@ type IngressService struct {
 	// Allow HTTP header manipulation to be configured.
 	RequestHeaders  *HTTPHeaderModifiers `json:",omitempty" alias:"request_headers"`
 	ResponseHeaders *HTTPHeaderModifiers `json:",omitempty" alias:"response_headers"`
+
+	MaxConnections        *uint32 `json:",omitempty" alias:"max_connections"`
+	MaxPendingRequests    *uint32 `json:",omitempty" alias:"max_pending_requests"`
+	MaxConcurrentRequests *uint32 `json:",omitempty" alias:"max_concurrent_requests"`
 }
 
 func (i *IngressGatewayConfigEntry) GetKind() string            { return i.Kind }

api/config_entry_gateways_test.go

@@ -29,6 +29,10 @@ func TestAPI_ConfigEntries_IngressGateway(t *testing.T) {
 			Enabled:       true,
 			TLSMinVersion: "TLSv1_2",
 		},
+		Defaults: &IngressServiceConfig{
+			MaxConnections:     uint32Pointer(2048),
+			MaxPendingRequests: uint32Pointer(4096),
+		},
 	}
 
 	global := &ProxyConfigEntry{
@@ -93,6 +97,9 @@ func TestAPI_ConfigEntries_IngressGateway(t *testing.T) {
 							CertResource: "bar",
 						},
 					},
+					MaxConnections:        uint32Pointer(5120),
+					MaxPendingRequests:    uint32Pointer(512),
+					MaxConcurrentRequests: uint32Pointer(2048),
 				},
 			},
 			TLS: &GatewayTLSConfig{
@@ -168,6 +175,9 @@ func TestAPI_ConfigEntries_IngressGateway(t *testing.T) {
 			require.True(t, ok)
 			require.Equal(t, ingress2.Kind, readIngress.Kind)
 			require.Equal(t, ingress2.Name, readIngress.Name)
+			require.Equal(t, *ingress2.Defaults.MaxConnections, *readIngress.Defaults.MaxConnections)
+			require.Equal(t, uint32(4096), *readIngress.Defaults.MaxPendingRequests)
+			require.Equal(t, uint32(0), *readIngress.Defaults.MaxConcurrentRequests)
 			require.Len(t, readIngress.Listeners, 1)
 			require.Len(t, readIngress.Listeners[0].Services, 1)
 			// Set namespace and partition to blank so that OSS and ent can utilize the same tests

proto/pbconfigentry/config_entry.gen.go

@@ -141,6 +141,11 @@ func IngressGatewayToStructs(s *IngressGateway, t *structs.IngressGatewayConfigE
 			}
 		}
 	}
+	if s.Defaults != nil {
+		var x structs.IngressServiceConfig
+		IngressServiceConfigToStructs(s.Defaults, &x)
+		t.Defaults = &x
+	}
 	t.Meta = s.Meta
 }
 func IngressGatewayFromStructs(t *structs.IngressGatewayConfigEntry, s *IngressGateway) {
@@ -162,6 +167,11 @@ func IngressGatewayFromStructs(t *structs.IngressGatewayConfigEntry, s *IngressG
 			}
 		}
 	}
+	if t.Defaults != nil {
+		var x IngressServiceConfig
+		IngressServiceConfigFromStructs(t.Defaults, &x)
+		s.Defaults = &x
+	}
 	s.Meta = t.Meta
 }
 func IngressListenerToStructs(s *IngressListener, t *structs.IngressListener) {
@@ -227,6 +237,9 @@ func IngressServiceToStructs(s *IngressService, t *structs.IngressService) {
 		HTTPHeaderModifiersToStructs(s.ResponseHeaders, &x)
 		t.ResponseHeaders = &x
 	}
+	t.MaxConnections = s.MaxConnections
+	t.MaxPendingRequests = s.MaxPendingRequests
+	t.MaxConcurrentRequests = s.MaxConcurrentRequests
 	t.Meta = s.Meta
 	t.EnterpriseMeta = enterpriseMetaToStructs(s.EnterpriseMeta)
 }
@@ -251,9 +264,28 @@ func IngressServiceFromStructs(t *structs.IngressService, s *IngressService) {
 		HTTPHeaderModifiersFromStructs(t.ResponseHeaders, &x)
 		s.ResponseHeaders = &x
 	}
+	s.MaxConnections = t.MaxConnections
+	s.MaxPendingRequests = t.MaxPendingRequests
+	s.MaxConcurrentRequests = t.MaxConcurrentRequests
 	s.Meta = t.Meta
 	s.EnterpriseMeta = enterpriseMetaFromStructs(t.EnterpriseMeta)
 }
+func IngressServiceConfigToStructs(s *IngressServiceConfig, t *structs.IngressServiceConfig) {
+	if s == nil {
+		return
+	}
+	t.MaxConnections = s.MaxConnections
+	t.MaxPendingRequests = s.MaxPendingRequests
+	t.MaxConcurrentRequests = s.MaxConcurrentRequests
+}
+func IngressServiceConfigFromStructs(t *structs.IngressServiceConfig, s *IngressServiceConfig) {
+	if s == nil {
+		return
+	}
+	s.MaxConnections = t.MaxConnections
+	s.MaxPendingRequests = t.MaxPendingRequests
+	s.MaxConcurrentRequests = t.MaxConcurrentRequests
+}
 func IntentionHTTPHeaderPermissionToStructs(s *IntentionHTTPHeaderPermission, t *structs.IntentionHTTPHeaderPermission) {
 	if s == nil {
 		return

proto/pbconfigentry/config_entry.pb.binary.go

@@ -187,6 +187,16 @@ func (msg *IngressGateway) UnmarshalBinary(b []byte) error {
 	return proto.Unmarshal(b, msg)
 }
 
+// MarshalBinary implements encoding.BinaryMarshaler
+func (msg *IngressServiceConfig) MarshalBinary() ([]byte, error) {
+	return proto.Marshal(msg)
+}
+
+// UnmarshalBinary implements encoding.BinaryUnmarshaler
+func (msg *IngressServiceConfig) UnmarshalBinary(b []byte) error {
+	return proto.Unmarshal(b, msg)
+}
+
 // MarshalBinary implements encoding.BinaryMarshaler
 func (msg *GatewayTLSConfig) MarshalBinary() ([]byte, error) {
 	return proto.Marshal(msg)

proto/pbconfigentry/config_entry.proto

@@ -228,6 +228,18 @@ message IngressGateway {
   GatewayTLSConfig TLS = 1;
   repeated IngressListener Listeners = 2;
   map<string, string> Meta = 3;
+  IngressServiceConfig Defaults = 4;
+}
+
+// mog annotation:
+//
+// target=github.com/hashicorp/consul/agent/structs.IngressServiceConfig
+// output=config_entry.gen.go
+// name=Structs
+message IngressServiceConfig {
+  uint32 MaxConnections = 1;
+  uint32 MaxPendingRequests = 2;
+  uint32 MaxConcurrentRequests = 3;
 }
 
 // mog annotation:
@@ -283,6 +295,9 @@ message IngressService {
   map<string, string> Meta = 6;
   // mog: func-to=enterpriseMetaToStructs func-from=enterpriseMetaFromStructs
   common.EnterpriseMeta EnterpriseMeta = 7;
+  uint32 MaxConnections = 8;
+  uint32 MaxPendingRequests = 9;
+  uint32 MaxConcurrentRequests = 10;
 }
 
 // mog annotation:

test/integration/connect/envoy/case-ingress-gateway-multiple-services/config_entries.hcl

@@ -11,6 +11,11 @@ config_entries {
       kind = "ingress-gateway"
       name = "ingress-gateway"
 
+      Defaults {
+        MaxConnections = 10
+        MaxPendingRequests = 20
+        MaxConcurrentRequests = 30
+      }
       listeners = [
         {
           port     = 9999
@@ -28,6 +33,9 @@ config_entries {
             {
               name  = "s1"
               hosts = ["test.example.com"]
+              MaxConnections = 100
+              MaxPendingRequests = 200
+              MaxConcurrentRequests = 300
             }
           ]
         }

test/integration/connect/envoy/case-ingress-gateway-multiple-services/verify.bats

@@ -23,11 +23,45 @@ load helpers
 }
 
 @test "ingress-gateway should have healthy endpoints for s1" {
-   assert_upstream_has_endpoints_in_status 127.0.0.1:20000 s1 HEALTHY 1
+  assert_upstream_has_endpoints_in_status 127.0.0.1:20000 s1 HEALTHY 1
+}
+
+@test "s1 proxy should have been configured with max_connections in services" {
+  CLUSTER_THRESHOLD=$(get_envoy_cluster_config 127.0.0.1:20000 s1.default.primary | jq '.circuit_breakers.thresholds[0]')
+  echo $CLUSTER_THRESHOLD
+
+  MAX_CONNS=$(echo $CLUSTER_THRESHOLD | jq --raw-output '.max_connections')
+  MAX_PENDING_REQS=$(echo $CLUSTER_THRESHOLD | jq --raw-output '.max_pending_requests')
+  MAX_REQS=$(echo $CLUSTER_THRESHOLD | jq --raw-output '.max_requests')
+
+  echo "MAX_CONNS = $MAX_CONNS"
+  echo "MAX_PENDING_REQS = $MAX_PENDING_REQS"
+  echo "MAX_REQS = $MAX_REQS"
+
+  [ "$MAX_CONNS" = "100" ]
+  [ "$MAX_PENDING_REQS" = "200" ]
+  [ "$MAX_REQS" = "300" ]
 }
 
 @test "ingress-gateway should have healthy endpoints for s2" {
-   assert_upstream_has_endpoints_in_status 127.0.0.1:20000 s2 HEALTHY 1
+  assert_upstream_has_endpoints_in_status 127.0.0.1:20000 s2 HEALTHY 1
+}
+
+@test "s2 proxy should have been configured with max_connections using defaults" {
+  CLUSTER_THRESHOLD=$(get_envoy_cluster_config 127.0.0.1:20000 s2.default.primary | jq '.circuit_breakers.thresholds[0]')
+  echo $CLUSTER_THRESHOLD
+
+  MAX_CONNS=$(echo $CLUSTER_THRESHOLD | jq --raw-output '.max_connections')
+  MAX_PENDING_REQS=$(echo $CLUSTER_THRESHOLD | jq --raw-output '.max_pending_requests')
+  MAX_REQS=$(echo $CLUSTER_THRESHOLD | jq --raw-output '.max_requests')
+
+  echo "MAX_CONNS = $MAX_CONNS"
+  echo "MAX_PENDING_REQS = $MAX_PENDING_REQS"
+  echo "MAX_REQS = $MAX_REQS"
+
+  [ "$MAX_CONNS" = "10" ]
+  [ "$MAX_PENDING_REQS" = "20" ]
+  [ "$MAX_REQS" = "30" ]
 }
 
 @test "ingress should be able to connect to s1 using Host header" {

website/content/docs/connect/config-entries/ingress-gateway.mdx

@@ -328,6 +328,7 @@ In the following example, two listeners are configured on an ingress gateway nam
 - The first listener is configured to listen on port `8080` and uses a wildcard (`*`) to proxy traffic to all services in the datacenter.
 - The second listener exposes the `api` and `web` services on port `4567` at user-provided hosts.
 - TLS is enabled on every listener.
+- The `max_connections` of the ingress gateway proxy to each upstream cluster is set to 4096.
 
 The Consul Enterprise version implements the following additional configurations:
 
@@ -346,6 +347,10 @@ TLS {
   Enabled = true
 }
 
+Defaults {
+  MaxConnections = 4096
+}
+
 Listeners = [
   {
     Port     = 8080
@@ -1041,6 +1046,38 @@ You can specify the following parameters to configure ingress gateway configurat
         },
       ],
     },
+    {
+      name: 'Defaults',
+      type: 'IngressServiceConfig: <optional>',
+      description: `Default configuration that applies to all upstreams.`,
+      children: [
+        {
+          name: 'MaxConnections',
+          type: 'int: 0',
+          description: `The maximum number of connections a service instance
+              will be allowed to establish against the given upstream. Use this to limit
+              HTTP/1.1 traffic, since HTTP/1.1 has a request per connection.
+              If not specified, it uses the default value. For example, 1024 for Envoy proxy.`,
+        },
+        {
+          name: 'MaxPendingRequests',
+          type: 'int: 0',
+          description: `The maximum number of requests that will be queued
+              while waiting for a connection to be established. For this configuration to
+              be respected, a L7 protocol must be defined in the \`protocol\` field.
+              If not specified, it uses the default value. For example, 1024 for Envoy proxy.`,
+        },
+        {
+          name: 'MaxConcurrentRequests',
+          type: 'int: 0',
+          description: `The maximum number of concurrent requests that
+              will be allowed at a single point in time. Use this to limit HTTP/2 traffic,
+              since HTTP/2 has many requests per connection. For this configuration to be
+              respected, a L7 protocol must be defined in the \`protocol\` field.
+              If not specified, it uses the default value. For example, 1024 for Envoy proxy.`,
+        },
+      ],
+    },
     {
       name: 'Listeners',
       type: 'array<IngressListener>: <optional>)',
@@ -1156,6 +1193,21 @@ You can specify the following parameters to configure ingress gateway configurat
                 },
               ],
             },
+            {
+              name: 'MaxConnections',
+              type: 'int: 0',
+              description: 'overrides for the [`Defaults` field](#available-fields)',
+            },
+            {
+              name: 'MaxPendingRequests',
+              type: 'int: 0',
+              description: 'overrides for the [`Defaults` field](#available-fields)',
+            },
+            {
+              name: 'MaxConcurrentRequests',
+              type: 'int: 0',
+              description: 'overrides for the [`Defaults` field](#available-fields)',
+            },
           ],
         },
         {