Outgoing emails are not sending from one particular site, "immediate alerts" timer job stuck on some specific database, owstimer.exe consumes high memory on one SharePoint server.
You can restart SharePoint timer service (SPTimerV4), but after some time the same happens again. If you have courage to wait enough - you can see 100% CPU load and WFE server not responding.
Microsoft "cloud first" initiative led us to the situation where SharePoint on-prem (SharePoint 2019) is just a branch (sub-project) of SharePoint Online project.
So "Hybrid" SharePoint environment is just a combination of two similar products - one in on-prem and the other one - in the cloud.
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1) you need to install Office Online Server as a part of process (Powershell script or DSC configuration)
2) you cannot use system (C:) drive. I.e. OOS must be installed on, e.g. D: drive
Solution: use "config.xml".
Agile vs Waterfall
If you are troubleshooting SharePoint search that does work in general, bot does'n work for a specific list or library
(i.e. Search box not working),
and you already checked list settings -> advanced -> Search.. Allow items...
and you already tried to reindex list and site,
it's time to ensure that default item view form is in place and works ok.
Of not - just create a new display item form and make it default.
Message center in Office 365 and a new reading role
Custom metadata integration with modern SPO pages and news