ignore core. properties in validator

validator.go

@@ -80,7 +80,7 @@ func ValidateSectionWithSchema(kind SectionKind, props property.Properties, sche
 	}
 
 	for _, p := range props {
-		if isCommonProperty(p.Key) || isCloudVariable(p.Key) || isCloudVariable(p.Value) {
+		if isCommonProperty(p.Key) || isCloudVariable(p.Key) || isCloudVariable(p.Value) || isCoreProperty(p.Key) {
 			continue
 		}
 
@@ -134,6 +134,13 @@ func areProcessors(key string) bool {
 	return strings.ToLower(key) == "processors"
 }
 
+// isCoreProperty tells whether the property is from Core.
+// Core properties start with `core.` and are ignored.
+// See https://github.com/chronosphereio/calyptia-core-fluent-bit/blob/71795c472bcb1f7e09a7ea121366d5f91df4263f/patches/pwhelan-flb_config-ignore-core-namespaced-properties.patch#L22-L25
+func isCoreProperty(key string) bool {
+	return strings.HasPrefix(key, "core.")
+}
+
 func validateProcessorsSectionMaps(sectionMaps []interface{}) error {
 	for _, section := range sectionMaps {
 		props := property.Properties{}

validator_test.go

@@ -354,6 +354,16 @@ func TestConfig_Validate(t *testing.T) {
 					query SELECT 'hello from sqldb' AS message
 			`,
 		},
+		{
+			name: "custom_core_property",
+			ini: `
+				[INPUT]
+					Name dummy
+				[OUTPUT]
+					Name s3
+					core.metadata name=foo
+			`,
+		},
 	}
 	for _, tc := range tt {
 		t.Run(tc.name, func(t *testing.T) {