Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

migrations/inputs_mqtt_consumer/migration.go

@@ -0,0 +1,43 @@
+package inputs_mqtt_consumer
+
+import (
+	"github.com/influxdata/toml"
+	"github.com/influxdata/toml/ast"
+
+	"github.com/influxdata/telegraf/migrations"
+)
+
+// Migration function
+func migrate(tbl *ast.Table) ([]byte, string, error) {
+	// Decode the old data structure
+	var plugin map[string]interface{}
+	if err := toml.UnmarshalTable(tbl, &plugin); err != nil {
+		return nil, "", err
+	}
+
+	// Check for deprecated option(s) and migrate them
+	var applied bool
+	if _, found := plugin["metric_buffer"]; found {
+		applied = true
+
+		// Remove the ignored setting
+		delete(plugin, "metric_buffer")
+	}
+
+	// No options migrated so we can exit early
+	if !applied {
+		return nil, "", migrations.ErrNotApplicable
+	}
+
+	// Create the corresponding plugin configurations
+	cfg := migrations.CreateTOMLStruct("inputs", "mqtt_consumer")
+	cfg.Add("inputs", "mqtt_consumer", plugin)
+
+	output, err := toml.Marshal(cfg)
+	return output, "", err
+}
+
+// Register the migration function for the plugin type
+func init() {
+	migrations.AddPluginOptionMigration("inputs.mqtt_consumer", migrate)
+}