Service Status displays warning for ICA Certificate and Certificate Chain Validity:

The Status is showing green for all other services and OS Metrics are displayed correctly.

The certificate is valid on the Storefront server, there are no certificate warnings when users try to access Storefront URL, This warning message is expected because the ICA File Signing is disabled by default on the Store.
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ICA File Signing is by default disabled on the Store.
To get rid of the warning message on ICA Certificate Validity and ICA Certificate Chain Validity, we must enable ICA file Signing and tag to the Certificate thumbprint used under Storefront server for ICA file signing.
$storeService = Get-STFStoreService
Set-STFStoreService $storeService -IcaFileSigning $true -IcaFileSigningCertificateThumbprint [certificatethumbprint]
Infrastructure Monitoring - Storefront monitoring: ICA Certificate Validity and ICA Certificate Chain Validity Warning
ICA File Signing: https://docs.citrix.com/en-us/storefront/current-release/secure/ica-file-signing.html
CWA ICA File Signing : https://docs.citrix.com/en-us/citrix-workspace-app-for-windows/security#ica-file-signing
These article and solution applies to the scenario where the customer would like to see service status for ICA Certificate Validity and ICA Certificate Chain Validity when Infrastructure monitoring displays warning.