in_process_exporter_metrics: convert rss memory from pages to bytes

plugins/in_process_exporter_metrics/pe.h

@@ -52,6 +52,7 @@ struct flb_pe {
     struct flb_input_instance *ins; /* input instance   */
     struct mk_list *metrics;        /* enabled metrics */
     int enabled_flag;               /* indicate enabled metrics */
+    long page_size;                  /* page size for converting number of pages to bytes */
 
     /*
      * Metrics Contexts

plugins/in_process_exporter_metrics/pe_config.c

@@ -100,6 +100,8 @@ struct flb_pe *flb_pe_config_create(struct flb_input_instance *ins,
         return NULL;
     }
 
+    ctx->page_size = sysconf(_SC_PAGESIZE);
+
     return ctx;
 }
 

plugins/in_process_exporter_metrics/pe_process.c

@@ -1106,6 +1106,8 @@ static int process_update(struct flb_pe *ctx)
                 tmp = entry->str;
                 /* Collect the number of RSS per process */
                 if (pe_utils_str_to_uint64(tmp, &val) != -1) {
+                    /* convert RSS memory in number of pages to bytes */
+                    val = val * ctx->page_size;
                     cmt_gauge_set(ctx->memory_bytes, ts, val, 4, (char *[]){ name, pid_str, ppid_str, "rss" });
                 }