Thursday, 1 October 2020

App Insights - Basic Introduction

OverviewAzure App Insights is a great platform for collecting logs and monitoring cloud based applications on Azure.  All Azure Services can push logging information into App Insight instances.  This can be errors, usages, perferformances logging that in turn is easy to query.  There are SDKs for developers that can be used to add custom logging to applications.

Retension:  App Insights can keep 730 days worth of logs.  For long term storage, "Continious Export" can be used to push data into storage accounts as soon as it arrives in AppInsigthts.  Retaining the App Insight logs for 90 days has no additional cost, so the default to store logs should be set to 90 days at least in most situations.

What is logged and what can be logged:  
  • All Azure Services can be configured to send service logs to a specific App Insight instance.
  • Instrument packages can be added to services to capture logs such as IIS, or background services.  You can pull in telemetry from infrastructure into App insights e.g. Docker logs, system events.
  • Custom code can also call the App Insight instance to add logging and hook into exceptions handling.  There are .NET, Node.JS, Phyton and other SDK's that should e used to add logging, exception capturing, performance and usage statistics.

App Insights has a REST API to query the logs.  The "API Explorer" tool is awesome for querying App Insights online.  


The data below comes from Microsoft Docs.

"What kinds of data are collected?

The main categories are:

  • Web server telemetry - HTTP requests. Uri, time taken to process the request, response code, client IP address. Session id.
  • Web pages - Page, user and session counts. Page load times. Exceptions. Ajax calls.
  • Performance counters - Memory, CPU, IO, Network occupancy.
  • Client and server context - OS, locale, device type, browser, screen resolution.
  • Exceptions and crashes - stack dumps, build id, CPU type.
  • Dependencies - calls to external services such as REST, SQL, AJAX. URI or connection string, duration, success, command.
  • Availability tests - duration of test and steps, responses.
  • Trace logs and custom telemetry - anything you code into your logs or telemetry."

Azure Dashboards


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