parse config for metrics fields

command/agent/config-test-fixtures/basic.hcl

@@ -60,6 +60,8 @@ client {
     gc_inode_usage_threshold = 91
     gc_max_allocs = 50
     no_host_uuid = false
+    disable_tagged_metrics = true
+    backwards_compatible_metrics = true
 }
 server {
 	enabled = true

command/agent/config.go

@@ -229,6 +229,14 @@ type ClientConfig struct {
 	// NoHostUUID disables using the host's UUID and will force generation of a
 	// random UUID.
 	NoHostUUID *bool `mapstructure:"no_host_uuid"`
+
+	// DisableTaggedMetrics disables a new version of generating metrics and
+	// uses only the old method of displaying metrics
+	DisableTaggedMetrics bool `mapstructure:"disable_tagged_metrics"`
+
+	// BackwardsCompatibleMetrics allows for generating metrics as done in older
+	// versions of Nomad
+	BackwardsCompatibleMetrics bool `mapstructure:"backwards_compatible_metrics"`
 }
 
 // ACLConfig is configuration specific to the ACL system
@@ -587,6 +595,8 @@ func DefaultConfig() *Config {
 			GCInodeUsageThreshold:      70,
 			GCMaxAllocs:                50,
 			NoHostUUID:                 helper.BoolToPtr(true),
+			DisableTaggedMetrics:       false,
+			BackwardsCompatibleMetrics: false,
 		},
 		Server: &ServerConfig{
 			Enabled:          false,
@@ -1097,6 +1107,14 @@ func (a *ClientConfig) Merge(b *ClientConfig) *ClientConfig {
 		result.NoHostUUID = b.NoHostUUID
 	}
 
+	if b.DisableTaggedMetrics {
+		result.DisableTaggedMetrics = b.DisableTaggedMetrics
+	}
+
+	if b.BackwardsCompatibleMetrics {
+		result.BackwardsCompatibleMetrics = b.BackwardsCompatibleMetrics
+	}
+
 	// Add the servers
 	result.Servers = append(result.Servers, b.Servers...)
 

command/agent/config_parse.go

@@ -357,6 +357,8 @@ func parseClient(result **ClientConfig, list *ast.ObjectList) error {
 		"gc_parallel_destroys",
 		"gc_max_allocs",
 		"no_host_uuid",
+		"disable_tagged_metrics",
+		"backwards_compatible_metrics",
 	}
 	if err := checkHCLKeys(listVal, valid); err != nil {
 		return err

command/agent/config_parse_test.go

@@ -81,6 +81,8 @@ func TestConfig_Parse(t *testing.T) {
 					GCInodeUsageThreshold:      91,
 					GCMaxAllocs:                50,
 					NoHostUUID:                 helper.BoolToPtr(false),
+					DisableTaggedMetrics:       true,
+					BackwardsCompatibleMetrics: true,
 				},
 				Server: &ServerConfig{
 					Enabled:                true,