out_stackdriver: do not allocate metadata_server by config map

Signed-off-by: Takahiro Yamashita <[email protected]>

Author: nokute78

plugins/out_stackdriver/stackdriver.c

@@ -2427,7 +2427,7 @@ static struct flb_config_map config_map[] = {
     },
     {
      FLB_CONFIG_MAP_STR, "metadata_server", (char *)NULL,
-     0, FLB_TRUE, offsetof(struct flb_stackdriver, metadata_server),
+     0, FLB_FALSE, 0,
      "Set the metadata server"
     },
     {

plugins/out_stackdriver/stackdriver_conf.c

@@ -261,7 +261,9 @@ struct flb_stackdriver *flb_stackdriver_conf_create(struct flb_output_instance *
     }
 
     /* Lookup metadata server URL */
-    if (ctx->metadata_server == NULL) {
+    ctx->metadata_server = NULL;
+    tmp = flb_output_get_property("metadata_server", ins);
+    if (tmp == NULL) {
         tmp = getenv("METADATA_SERVER");
         if(tmp) {
             if (ctx->env == NULL) {
@@ -279,6 +281,9 @@ struct flb_stackdriver *flb_stackdriver_conf_create(struct flb_output_instance *
             ctx->metadata_server = flb_sds_create(FLB_STD_METADATA_SERVER);
         }
     }
+    else {
+        ctx->metadata_server = flb_sds_create(tmp);
+    }
     flb_plg_info(ctx->ins, "metadata_server set to %s", ctx->metadata_server);
 
     /* Lookup credentials file */