My Metrics Azure Monitoring show error http 5xx from some time and logs shows cup usage but monitor shows it was normal

Ahmad Mustafa 1 Reputation point
2021-09-04T20:25:31.387+00:00

My azure monitor shows http 5xx error. It happens before but stable then it happen again from some days When I see diagnostic Detail logs it shows

Heartbeat took longer than "00:00:01" at "09/04/2021 01:08:21 +00:00"  

But when I show server CPU monitor log it shows normal usage you can see 30 days usage below

129289-image.png

Here is Http error from azure monitor screen shot
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Here is diagnostics reports shows why errors came
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What I have tried is :
Restarted Server
Upscale instance Vertically/Horizontally

I am so confused what should I do ?

Azure App Service
Azure App Service
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
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  1. ajkuma 23,631 Reputation points Microsoft Employee
    2021-09-06T20:18:30.193+00:00

    @Ahmad Mustafa , Firstly, apologies for the delayed response on this from over the weekend.

    On which region have you provisioned your WebApp? App Service - Central US or Application Insights - West Europe? What’s the exact time in UTC that you experienced these issues?

    You may review your Azure Service Health alerts, there were a couple of issues identified which were mitigated.

    From Azure Portal alert:
    Summary of Impact:
    Between 15:44 UTC and 18:09 UTC on 03 Sep 2021, you have been identified as a customer using Apps Service in Central US who may have received intermittent HTTP 500-level response codes or timeouts when accessing their resources via HTTP or HTTPS.

    Preliminary Root Cause:
    An increase in the number of incoming requests to a single underlying endpoint led to that endpoint reaching an operational threshold, causing some connections to fail.
    Mitigation: We manually throttled incoming traffic.

    Next Steps: We will continue to investigate to establish the full root cause and identify necessary repairs and preventative actions to help deter issues like this from occurring.