Maintenance Mode in SharePoint Online and Modern pages

Turns out, if you append ?maintenancemode=true of your SharePoint page you will see a special maintenance view:

On your page, you will see a summary of data from the Manifest and Data tabs. The summary information includes:

Alias	The name of the web part
Id	The unique ID of the web part
Instance Id	The ID of a specific instance of a web part (that is, if you have two more of the same web parts on a page, they will each have the same web part ID, but a different instance ID.
IsInternal	Indicates whether the web part was made by Microsoft or a third party. If True, it is made by Microsoft. If False, it is made by a third party.
Version	The version number of the web part.
Environment	Environment: Indicates the SharePoint environment in use. 0 = Test environment 1 = Local Workbench 2 = SharePoint 3 = Classic SharePoint
UserAgent	A string that contains information about the device and software in use (such as browser type and version).

Microsoft article "Open and use the web part maintenance page"

SharePoint Online Performance. Easy Way to Capture Metrics

I've stumbled across an interesting Chrome Extension Page Diagnostics for SharePoint Chrome extension. It shows some useful info on the page performance.


Microsoft Article "Use the Page Diagnostics tool for SharePoint Online"

In my case SPRequestDuration and SPIISLatency were not displayed, but you can get these values by simply pressing F12 and typing g_iisLatency and/or g_duration in the console:
g_iisLatency - Shows network latency between the client browser and the IIS server
g_duration - Shows the time it took the page to be returned to the client browser

Update:
I've found out that g_iisLatency and g_duration only show up in the classic pages.

Creating Forms for SharePoint Online using PowerApps, AngularJs, React or Nintex

Here my short presentation on the best options of creating forms in office 365, SharePoint Online

Disclaimer. I've made a couple of mistakes:
1. There is no mobile app for Microsoft Forms. But it MS Forms links open fine in any mobile browser. I guess there is no point in having the app in the first place.
2. The last app I've demonstrated was written using React+TypeScript, not AngularJs.

Determine if SharePoint has enough memory allocated to the distributed cache service

After reading half a dozen articles explaining how to eyeball and calculate the distributed cache size I was wondering: Why no one suggests just to check the current consumption before changing anything? Here is a scary thought: What if we have a ton of memory and we don't need to add any more? I know, this sounds revolutionary.

This is a quick script that I've slapped together to show 1) maximum allocated memory for  the Distributed cache. 2) current usage for all AppFabric caches on the current server.

So, before bumping the Distributed cache, test the current consumption with the script below.

###### DETERMINE IF YOU HAVE ENOUGH MEMORY ALLOCATED TO DISTRIBUTED CACHE:
Add-PSSnapin Microsoft.SharePoint.Powershell
Use-CacheCluster
$hostname = hostname
$configuration = Get-AFCacheHostConfiguration -ComputerName $hostname -CachePort "22233"
Write-host Maximum Size: $($configuration.size)MB HostName: $($configuration.HostName) -ForegroundColor Blue
# Get-AFCache | % {Get-AFCacheConfiguration -CacheName $_.CacheName}
$caches = Get-AFCache | % {Get-AFCacheConfiguration -CacheName $_.CacheName}

 foreach($cache in $caches){
  $stats = Get-AFCacheStatistics $cache.CacheName
  Write-host $cache.CacheName -ForegroundColor Green Cache.
  Write-host Usage: $($stats.Size / 1MB) MB
  Write-host
 }

###### DETERMINE IF YOU HAVE ENOUGH MEMORY ALLOCATED TO DISTRIBUTED CACHE END

Here is the sample result: