Microsoft Azure Application Gateway

• Microsoft Azure Application Gateway - An Overview
• Creating a new Azure Application Gateway Monitor
• Monitored Parameters

Microsoft Azure Application Gateway - An Overview

Azure Application Gateway serves as a load balancer for web traffic, allowing you to effectively control and direct the flow of traffic to your web applications. It offers a range of load balancing capabilities at the layer 7 (application layer), encompassing features like SSL termination, session affinity based on cookies, routing based on URL paths, and functionality for a web application firewall (WAF). Use Applications Manager's Azure Application Gateway Monitoring tool to monitor Application Gateway effectively and ensure the availability, performance, and security of your web applications.

Creating a new Microsoft Azure Application Gateway Monitor

To learn how to create a new Microsoft Azure Application Gateway Monitor, click here.

Monitored Parameters

Navigate to the Category View by clicking the Monitors tab. Hover over 'Child Monitors' under Microsoft Azure in the Cloud Apps table, and then select the Application Gateways monitor from the displayed tooltip. This action will display the bulk configuration view for Azure Application Gateway in three tabs:

• Availability tab gives the Availability history for the past 24 hours or 30 days.
• Performance tab gives the Health Status and events for the past 24 hours or 30 days.
• List view enables you to perform bulk admin configurations.

The Microsoft Azure monitor provides a brief detail of the Azure Application Gateway under the given subscription. Following are the list of metrics monitored in Azure Application Gateway Monitoring in their corresponding tabs:

• Overview
• Frontend
• Backend
• Configuration

Overview

Parameter	Description	Supported Tiers
		Standard	Standard_v2	WAF	WAF_v2
DATA TRAFFIC
Outgoing Bytes	The total number of bytes sent by the Application Gateway to the clients between the poll interval (in MB).
Incoming Bytes	The total number of bytes received by the Application Gateway from the clients between the poll interval (in MB).
DATA THROUGHPUT
Data Throughput	The average number of bytes the Application Gateway has served per second between the poll interval (in MB/s).
CPU UTILIZATION
CPU Utilization	The average utilization of the CPU allocated to the application gateway resource at the time of polling (in %).
COMPUTE UNITS
Current Compute Units	The average number of Compute Units consumed between the poll interval.
CAPACITY UNITS
Current Capacity Units	The average number of Capacity Units consumed between the poll interval.
Fixed Billable Capacity Units	The average of the minimum capacity units that will be charged between the poll interval.
Estimated Billed Capacity Units	The average number of Capacity Units using which billing is estimated between the poll interval.

Frontend

Parameter	Description	Supported Tiers
		Standard	Standard_v2	WAF	WAF_v2
TIMINGS
Client Round Trip Time	The average round-trip time between clients and the Application Gateway between the poll interval (in milliseconds).
Application Gateway Total Time	The average time taken for a request to be received, processed, and its response to be sent between the poll interval (in milliseconds).
REQUEST COUNTERS
Total Requests	The total number of successful requests the Application Gateway has served from the backend pool targets between the poll interval.
Request Rate	The total number of successful requests the Application Gateway has served per minute between the poll interval (in requests/min).
Client TLS Protocol	The total number of TLS and non-TLS requests initiated by clients that established a connection with the Application Gateway between the poll interval.
FAILED REQUESTS
Failed Requests	The total number of requests the Application Gateway has served with 5xx server error codes between the poll interval.
CURRENT CONNECTIONS
Current Connections	The total number of concurrent connections active from clients to the Application Gateway between the poll interval.
NEW CONNECTIONS RATE
New Connections Rate	The average number of new TCP connections per second established from clients to the Application Gateway and from the Application Gateway to the backend members between the poll interval (in connections/s).
RESPONSE STATUS
1xx Responses	The total number of responses resulting in 1xx HTTP response status code (Informational response) returned by Application Gateway between the poll interval.
2xx Responses	The total number of responses resulting in 2xx HTTP response status code (Successful response) returned by Application Gateway between the poll interval.
3xx Responses	The total number of responses resulting in 3xx HTTP response status code (Redirection response) returned by Application Gateway between the poll interval.
4xx Responses	The total number of responses resulting in 4xx HTTP response status code (Client error response) returned by Application Gateway between the poll interval.
5xx Responses	The total number of responses resulting in 5xx HTTP response status code (Server error response) returned by Application Gateway between the poll interval.

Backend

Parameter	Description	Supported Tiers
		Standard	Standard_v2	WAF	WAF_v2
HOST COUNT
Unhealthy Hosts	The average number of backends that are determined unhealthy by the health probe between the poll interval.
Healthy Hosts	The average number of backends that are determined healthy by the health probe between the poll interval.
REQUEST THROUGHPUT
Request Throughput (per Healthy Host)	The average number of requests received by each healthy member in a backend pool within a minute between the poll interval.
BACKEND TIMINGS
Backend Connect Time	The average amount of time spent establishing a connection with the backend application between the poll interval (in milliseconds).
Backend First Byte Response Time	The average time interval between the start of establishing a connection to the backend server and receiving the first byte of the response header between the poll interval (in milliseconds).
Backend Last Byte Response Time	The average time interval between the start of establishing a connection to the backend server and receiving the last byte of the response body between the poll interval (in milliseconds).
BACKEND RESPONSE STATUS
Backend Response Status	The total number of HTTP response status codes returned by the backends between the poll interval.

WAF

Parameter	Description	Supported Tiers
		WAF	WAF_v2
WAF COUNTERS
WAF Total Requests	The total number of requests served by the WAF engine between the poll interval.
WAF Custom Rule Matches	The total number of custom rule matches made between the poll interval.
WAF Managed Rule Matches	The total number of managed rule matches made between the poll interval.
WAF Bot Protection Matches	The total number of bot protection rule matches that have been blocked or logged from harmful IP addresses between the poll interval.
WAF Blocked Requests Rule Distribution	The total number of rules hit distributed for the blocked requests by Rule Group and Rule ID between the poll interval.
WAF Total Rule Distribution	The total number of matched requests distributed by Rule Group and Rule ID between the poll interval.

Configuration