Oh my watchdog.

src/main.rb

@@ -59,6 +59,7 @@ def main
   grace_deadline = Time.now + INITIAL_GRACE
   while Time.now < grace_deadline
     sleep 5
+    SystemdNotifier.notify('WATCHDOG=1')
     next unless ServerStatusDetector::MinecraftServer.self_diag[:type]
 
     MethodExecutor.record('info', 'mainloop',

src/server_status_detector.rb

@@ -24,7 +24,7 @@ module ServerStatusDetector
     # @param port [Integer]
     # @param timeout [Integer]
     # @return [Hash{Symbol=>Integer, Symbol=>Symbol, Symbol=>Float,nil}]
-    def self.test_port(host = '127.0.0.1', port = 25_565, timeout = 10)
+    def self.test_port(host = '127.0.0.1', port = 25_565, timeout = 2)
       result = {
         port: port,
         status: :unknown,

src/systemd_notifier.rb

@@ -52,7 +52,6 @@ class SystemdNotifier
       MethodExecutor.record('debug', 'heartbeat', "Heartbeat sent: #{message}")
     rescue StandardError => e
       MethodExecutor.record('error', 'heartbeat', "Failed to send heartbeat: #{e}")
-      @enable_heartbeat = false
     end
   end
 end

src/updates.rb

@@ -18,7 +18,7 @@ require 'net/http'
 require 'uri'
 
 # @type const RELEASE_SERIAL_CODE: String
-RELEASE_SERIAL_CODE = '13c4c19'
+RELEASE_SERIAL_CODE = '13c4c19git '
 # @type const CHANNEL: String
 CHANNEL = 'dev'
 # @type const VERSION_LIST_URL: String