in_node_exporter_metrics: Increase buffer size to read /proc/stat correctly

The "intr" entry of proc stat can be larger than 512 chars, and generate errors
leading to stalled CPU metrics if it's the wrong length.

Signed-off-by: Pierre-Yves Rofes <[email protected]>

Author: piwai

plugins/in_node_exporter_metrics/ne_utils.c

@@ -153,7 +153,7 @@ int ne_utils_file_read_lines(const char *mount, const char *path, struct mk_list
     int len;
     int ret;
     FILE *f;
-    char line[512];
+    char line[2048];
     char real_path[2048];
 
     mk_list_init(list);