> What are the most common things a sysadmin does daily - reacting to monitoring alerts and critical messages in logs. First you need to understand what given

> What are the most common things a sysadmin does daily - reacting to monitoring alerts and critical messages in logs. First you need to understand what given alert/message mean, and then goes troubleshooting if root cause is not obvious - improving monitoring system settings/thresholds/metrics (if there no separate teem for this) - deployment (but it often performed by developers) - upgrading OS and 3rd party software (if 3rd party software not deployed alongside own code) - performance tuning - learning software used in production (both: 3rd and written in the company) - writing numerous config files and ensuring that all settings adequate to given environment/system - if system is not entirely in cloud - replacing broken hardware and parts (HDD), usually using "remote hands" in datacenter. - managing ACLs / credentials for different systems, e.t.c.