1 files changed, 81 insertions, 0 deletions
diff --git a/collectors/proc.plugin/proc_sys_fs_file_nr.c b/collectors/proc.plugin/proc_sys_fs_file_nr.c
new file mode 100644
index 000000000..570945d01
--- /dev/null
+++ b/collectors/proc.plugin/proc_sys_fs_file_nr.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "plugin_proc.h"
+
+int do_proc_sys_fs_file_nr(int update_every, usec_t dt) {
+    (void)dt;
+
+    static procfile *ff = NULL;
+
+    if(unlikely(!ff)) {
+        char filename[FILENAME_MAX + 1];
+        snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/sys/fs/file-nr");
+        ff = procfile_open(config_get("plugin:proc:/proc/sys/fs/file-nr", "filename to monitor", filename), "", PROCFILE_FLAG_DEFAULT);
+        if(unlikely(!ff)) return 1;
+    }
+
+    ff = procfile_readall(ff);
+    if(unlikely(!ff)) return 0; // we return 0, so that we will retry to open it next time
+
+    uint64_t allocated = str2ull(procfile_lineword(ff, 0, 0), NULL);
+    uint64_t unused = str2ull(procfile_lineword(ff, 0, 1), NULL);
+    uint64_t max = str2ull(procfile_lineword(ff, 0, 2), NULL);
+
+    uint64_t used = allocated - unused;
+
+    static RRDSET *st_files = NULL;
+    static RRDDIM *rd_used = NULL;
+
+    if(unlikely(!st_files)) {
+        st_files = rrdset_create_localhost(
+                "system"
+                , "file_nr_used"
+                , NULL
+                , "files"
+                , NULL
+                , "File Descriptors"
+                , "files"
+                , PLUGIN_PROC_NAME
+                , "/proc/sys/fs/file-nr"
+                , NETDATA_CHART_PRIO_SYSTEM_FILES_NR
+                , update_every
+                , RRDSET_TYPE_LINE
+        );
+
+        rd_used = rrddim_add(st_files, "used", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+    }
+
+    rrddim_set_by_pointer(st_files, rd_used, (collected_number )used);
+    rrdset_done(st_files);
+
+    static RRDSET *st_files_utilization = NULL;
+    static RRDDIM *rd_utilization = NULL;
+
+    if(unlikely(!st_files_utilization)) {
+        st_files_utilization = rrdset_create_localhost(
+                "system"
+                , "file_nr_utilization"
+                , NULL
+                , "files"
+                , NULL
+                , "File Descriptors Utilization"
+                , "percentage"
+                , PLUGIN_PROC_NAME
+                , "/proc/sys/fs/file-nr"
+                , NETDATA_CHART_PRIO_SYSTEM_FILES_NR + 1
+                , update_every
+                , RRDSET_TYPE_LINE
+        );
+
+        rd_utilization = rrddim_add(st_files_utilization, "utilization", NULL, 1, 10000, RRD_ALGORITHM_ABSOLUTE);
+    }
+
+    NETDATA_DOUBLE d_used = (NETDATA_DOUBLE)used;
+    NETDATA_DOUBLE d_max = (NETDATA_DOUBLE)max;
+    NETDATA_DOUBLE percent = d_used * 100.0 / d_max;
+
+    rrddim_set_by_pointer(st_files_utilization, rd_utilization, (collected_number)(percent * 10000));
+    rrdset_done(st_files_utilization);
+
+    return 0;
+}