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diff --git a/tojo-tokyo/monitoring.scm b/tojo-tokyo/monitoring.scm
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+;;; Monitoring --- Server monitoring
+;;; Copyright © 2021 Masaya Tojo <masaya@tojo.tokyo>
+;;;
+;;; This file is part of Monitoring.
+;;;
+;;; Monitoring is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; Monitoring is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Monitoring.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (tojo-tokyo monitoring)
+  #:use-module (ice-9 popen)
+  #:use-module (ice-9 textual-ports)
+  #:use-module (ice-9 regex)
+  #:use-module ((srfi srfi-1) #:select (any))
+  #:use-module (web client))
+
+(define-public current-df-command (make-parameter "df"))
+(define-public current-heartbeat-url
+  (make-parameter
+   (let ((heartbeat-file "/etc/heartbeat-url"))
+     (or (and (file-exists? heartbeat-file)
+              (call-with-input-file heartbeat-file get-line))
+         "https://heartbeat.test"))))
+
+(define (df)
+  (let ((port (open-input-pipe (current-df-command))))
+    (get-line port)
+    (let f ((line (get-line port)))
+      (cond ((eof-object? line)
+             (close-pipe port)
+             '())
+            (else
+             (cons (map cons
+                        '(filesystem 1k-blocks used available use% mounted-on)
+                        (map match:substring (list-matches "[^ ]+" line)))
+                   (f (get-line port))))))))
+
+(define-public (disk-use%-over? threshold)
+  (any (lambda (x)
+         (let ((use% (string->number (string-delete #\% (assoc-ref x 'use%)))))
+           (< threshold use%)))
+       (filter (lambda (x)
+                 (let ((fs (assoc-ref x 'filesystem)))
+                   (and fs
+                        (<= 5 (string-length fs))
+                        (string=? (substring fs 0 5) "/dev/"))))
+               (df))))
+
+(define-public (heartbeat)
+  (http-request (current-heartbeat-url)))