Simple "Oh shit" uptime checker for when nothing else is set up yet, displays OSX notification when URL returns a non-200 code.

README

cd ~/Library/LaunchAgents/
# plist goes in this directory
launchctl load com.aaron.whatever.plist
# Disable:
launchctl unload com.aaron.whatever.plist

com.aaron.urgent.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.aaron.urgent</string>

  <key>ProgramArguments</key>
  <array>
    <string>/Users/aaron/scripts/urgent.sh</string>
  </array>

  <key>StartInterval</key>
  <integer>15</integer>

  <key>RunAtLoad</key>
  <true/>

  <key>StandardErrorPath</key>
  <string>/tmp/aaronurgent.err</string>

  <key>StandardOutPath</key>
  <string>/tmp/aaronurgent.out</string>
</dict>
</plist>

urgent.sh

#!/bin/bash
#
# Runs every 15 seconds, see /Users/aaron/Library/LaunchAgents/com.aaron.urgent.plist 
# 

code=$(curl --silent --output /dev/null -w "%{http_code}" http://host.com/api/products/squirt-1-5-lts)
if [ "$code" -ne "200" ]
then
  osascript -e "display notification \"SITE RETURNING $code\" with title \"MAJOR FUCKUP ALERT\""
fi