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README.md

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 ### CloudWatch Alternatives and Lock-In
 
 * CloudWatch offers fairly basic functionality that doesn't create significant (additional) AWS lock-in. Most of the metrics provided by the service can be obtained through APIs that can be imported into other aggregation or visualization tools or services (many specifically provide CloudWatch data import services).
-* 🚪 Alternatives to CloudWatch monitoring services include [NewRelic](http://newrelic.com/), [Datadog](http://datadog.com/), [Sumo Logic](http://sumologic.com/), [Zabbix](http://zabbix.com/), [Nagios](http://nagios.org/), [Ruxit](http://ruxit.com/), [Elastic Stack](https://www.elastic.co/v5), open source options such as [StatsD](https://github.com/etsy/statsd) or [collectd](https://collectd.org/) with [Graphite](https://graphiteapp.org/), and many others.
+* 🚪 Alternatives to CloudWatch monitoring services include [NewRelic](http://newrelic.com/), [Datadog](http://datadog.com/), [Sumo Logic](http://sumologic.com/), [Zabbix](http://zabbix.com/), [Nagios](http://nagios.org/), [Ruxit](http://ruxit.com/), [Elastic Stack](https://www.elastic.co/elk-stack), open source options such as [StatsD](https://github.com/etsy/statsd) or [collectd](https://collectd.org/) with [Graphite](https://graphiteapp.org/), and many others.
 * 🚪 CloudWatch Log alternatives include [Splunk](http://splunk.com/), [Sumo Logic](http://sumologic.com/), [Loggly](http://loggly.com/), [Logstash](https://www.elastic.co/products/logstash), [Papertrail](https://papertrailapp.com/), [Elastic Stack](https://www.elastic.co/elk-stack), and other centralized logging solutions.
 
 ### CloudWatch Tips