Pretty much agree with what r-s has written above.Have spent 11+ years working/consulting for mostly startups. Have used everything listed above except Salt (Nothing against it but the Salt team should look to so some PR and build their case) and a lot more.
For example, this job post mentions nothing about monitoring solutions like Zabbix or centralized logging solutions like Graylog or message queues like RabbitMQ or any of the myriad specialized data stores, etc.
For example, this job post mentions nothing about monitoring solutions like Zabbix or centralized logging solutions like Graylog or message queues like RabbitMQ or any of the myriad specialized data stores, etc.