https://www.elastic.co/webinars/introduction-elk-stack
http://blog.takipi.com/the-7-log-management-tools-you-need-to-know/
https://sematext.com/logsene/index.html (ELK)
https://logentries.com/
https://www.loggly.com/
https://www.reddit.com/r/devops/comments/2moubk/logging_tools_logstash_vs
https://www.sumologic.com/
Subdomain-or-subdirectory
https://www.quora.com/Subdomain-or-subdirectory-which-one-is-better-for-SEO
finally Landed on SumoLogic
Choosing Sentry for SPA Monitoring
