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http://airbrakeapp.com/
Airbrak collects error messages from Ruby on Rails (and others via unofficial plugins) apps and collects them for review. Looks interesting. Starts at $5/month up to 4 projects, 4 users, 15 errors per minute.
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http://alertfox.com/
Monitoring with a focus on browser experience. Plans are €10/month for simple, $50/month for 1 browser, $100/month upwards for the full service.
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http://aql.com/site/email2sms.php
aql offer an email to SMS service and offer a link to nagios server monitoring.
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http://blitz.io/
Performance testing, monitoring, and some kind of fix-it service, mostly in private beta. Flashy, funky, cool, style design and chat with limited technical details.
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http://blog.cfelde.com/2011/05/performance-rackspace-cloud-vs-amazon-web-services/
Interesting article comparing Rackspace and AWS performance when applying high frequency trading strategies against 10 years of archive data. Rackspace io kicks ass, CPU slightly ahead.
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http://cacti.net/
A web based tool to produce graphs based on data stored in RRDTool, usually used as a front end for data collected through systems like nagios.
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http://copperegg.com/
Yet another monitoring app. Copper Egg combines real user monitoring, generic metric logging, server monitoring and maybe other stuff(?) into one application. Pricing starts at $19/month. Not unreasonable.
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http://engineering.gomiso.com/2011/01/04/easy-monitoring-of-varnish-with-munin/
Very useful walkthrough on setting up munin to monitor Varnish. Explains how to install and configure munin, which is very simple and very valuable.
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http://newrelic.com/
A system to monitor multiple aspects of a live application in production including the page load times, server load times, mysql response times, javascript render times, and so on. Expensive.
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http://runslikeclockwork.com/
Very simple web monitoring system that checks if a site is online and sends alerts by SMS If down. They also offer a free monit aggregation service. Plans start £3/month basic, £5/month for 5 sites every 30 seconds plus 15 sms credits / month.
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http://runslikeclockwork.com/pages/monit_aggregator
A free hosted version of the open source monit-aggregator written by Matt Fawcett. Appears to be free with no node restriction.
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http://tribily.com/
Hosted zabbiz service, starts at €5 per server per month. Not sure about data retention.
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http://www.badllama.com/content/monitor-varnish-zabbix
Handy little script to monitor varnish stats from zabbix. Awesome.
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http://www.brandseye.com/
BrandsEye is an online reputation monitoring tool from Quirk. Quirk are a Cape Town based online media company. ORM is monitoring what people are saying and how they perceive your brand online, in an automated way.
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http://www.elevatedcode.com/articles/2007/12/05/replication-monitoring-with-monit/
Clever approach to monitoring mysql replication with monit. Ruby script checks replication is running and then touches a file, monit in turn monitors that file's timestamp and if it gets out of date, sends an alert. Sort of like a dead man switch. Clever.
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http://www.filtrbox.com/
filtrbox allows you to manage all your incoming "content". It's called "business grade content monitoring for professionals and SMBs". It watches for relevant stuff, and delivers it in a single, simple format. It's currently free (Mar 2008).
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http://www.intodns.com/
Really detailed tool that diagnoses in great detail each step of the DNS resolution process for a domain. Free and invaluable.
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http://www.ipipi.com/
ipipi.com is an SMS gateway service. You can send messages online, via email, etc.
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http://www.maatkit.org/doc/mk-heartbeat.html
Simple script to monitor mysql replication delay. It updates a value on the master every second and checks how far behind the value is on the slave. Simple yet effective.
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http://www.pagerduty.com/
Takes alerts from monitoring systems and sends emails, phone calls and SMS messages. Handles on-call schedules, escalation, acknowledgement, etc.
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http://www.strangeloopnetworks.com/
In a similar vein to cloudflare / yottaa, strangeloop offer a performance enhancement service through a physical / cloud based appliance. It uses the standard techniques, js/css combining, sprites, cdn, tailoring to the browser, and so on. No pricing. :-(
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http://www.textmagic.com/
TextMagic is a global sms delivery service. You can delivery texts via email, gateways, their own windows app, etc.
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http://www.tildeslash.com/monit/
monit is a utility for managing and monitoring, processes, files, directories and devices on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.
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http://www.ubuntugeek.com/monitoring-ubuntu-services-using-monit.html
A howto on setting up monit on an Ubuntu server. Fairly simple and straightforward. Includes basic info on customising alerts and so on.
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http://www.yireo.com/software/magento-extensions/newrelic
A Magento extension to integrate with NewRelic's monitoring system. I suppose it's a Magento wrapper for the NewRelic PHP library.
