Editing Training 2022 Linux team/ (section)

==Nagios training session Dated 29 Dec 2022 - Tetra Support Staff - Varad==

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'''Video summary:''' "Nagios training session 29 12 2022" -- a dedicated dashboard-navigation training for the Nagios monitoring platform (complementing the shorter Nagios segment in "Training Session OTRS, Wiki & Nagios Monitoring"). Tours the main views: Hosts (every monitored client/server, with up/down status -- demonstrated live with an actually-down server, "IMSS Tribune"), Host Groups and Hostgroup Grid (per-client server groupings with rolled-up OK/warning/critical/pending counts), and the technical overview dashboard showing totals (~758 services monitored, at the time 1 service in a problem state). Explains what specific alerts mean and how each gets resolved: SSL certificate expiry alerts (checked by domain expiry date, e.g. flagging a domain expiring in ~66 days as not yet urgent versus one expiring next month, escalated to L2 engineers, with a reminder to update the client and remove the domain from the watch list once renewed); root-partition/disk-usage warnings (won't clear until the underlying disk space is actually freed, unlike CPU-load or memory-utilization alerts which are typically transient and self-clear); and the difference between alerts requiring action versus those that just need a 15-minute wait-and-refresh cycle to auto-clear (e.g. temporary load spikes). Demonstrates the mail-queue-clearing workflow live for two named servers -- a relay server ("Relay 2") and Hero MotoCorp's mail server -- explaining that persistent mail-queue-count alerts require logging into that specific server and running a queue-flush command (distinct commands per server/context), unlike other alert types. Also covers reading the graph view for a host (total/down/warning counts visualized over time) and reiterates the standing team norm: any alert encountered should be posted/updated in the team's alert-tracking group as part of the response, not just resolved silently.