Microsoft Azure App Service Slot Monitoring
Microsoft Azure App Service Slot - An Overview
Azure App Service Slot is a deployment feature within Azure App Service that allows teams to deploy applications to a separate slot - a live environment with its own hostname - before swapping to production. Slots support independent configurations, enabling staged deployment workflows, A/B testing, and zero-downtime releases.
Applications Manager's Azure App Service Slot monitoring provides visibility into the performance and health of each deployment slot. Track CPU usage, memory consumption, HTTP request traffic, response times, I/O throughput, network bandwidth, garbage collection activity, and configuration details to ensure each slot is operating as expected.
Creating a new Azure App Service Slot Monitor
To learn how to create a new Azure App Service Slot 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 App Service Slots monitor from the displayed tooltip. This action displays the bulk configuration view for Azure App Service Slot 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 App Service Slot under the given subscription. The following metrics are monitored in the corresponding tabs:
Overview
| Parameter | Description |
|---|
| DEPLOYMENT SLOT STATE |
| Deployment Slot State | The current state of the Azure App Service Slot. |
| CPU TIME |
| CPU Time | The total amount of time that the CPU has spent executing code for that app between the poll interval (in s). |
| HEALTH CHECK STATUS |
| Health Check Status | The average percentage of health check status that indicates the overall health of the app between the poll interval (in %). |
| FUNCTION EXECUTION UNITS |
| Function Execution Units | The total Function Execution Units between the poll interval (in GB-s). GB-s is a combination of execution time and your memory usage. |
| FUNCTION EXECUTION RATE |
| Function Execution Rate | The total Function Execution Rate per minute between the poll interval (in executions/min). |
| RESPONSE TIME |
| Response Time | The average time taken for the app to serve requests between the poll interval (in ms). |
| FILE SYSTEM USAGE |
| File System Usage | The average amount of storage space that is used by the files that are associated with your app between the poll interval (in MB). |
Performance
| Parameter | Description |
|---|
| MEMORY WORKING SET |
| Memory Working Set (Max) | The maximum amount of memory used by the app between the poll interval (in MB). |
| Memory Working Set (Avg) | The average amount of memory used by the app between the poll interval (in MB). |
| NETWORK BANDWIDTH USAGE |
| Incoming Traffic Rate | The total incoming traffic per minute to the Azure App Service Slot between the poll intervals (in MB/min). |
| Outgoing Traffic Rate | The total outgoing traffic per minute from the Azure App Service Slot between the poll intervals (in MB/min). |
| Incoming Traffic | The average incoming bandwidth consumed by the app between the poll interval (in MB). |
| Outgoing Traffic | The average outgoing bandwidth consumed by the app between the poll interval (in MB). |
| IO OPERATIONS |
| IO Read Operations Rate | The average rate at which the app process is issuing read I/O operations between the poll interval (in MB/s). |
| IO Write Operations Rate | The average rate at which the app process is issuing write I/O operations between the poll interval (in MB/s). |
| IO THROUGHPUT |
| IO Read Throughput | The average rate at which the app process is reading bytes from I/O operations between the poll interval (in MB/s). |
| IO Write Throughput | The average rate at which the app process is writing bytes to I/O operations between the poll interval (in MB/s). |
Requests
| Parameter | Description |
|---|
| REQUESTS |
| Request Rate | The total number of requests regardless of their resulting HTTP status code received per minute by the app between the poll interval (in requests/min). |
| Total Requests | The total number of requests regardless of their resulting HTTP status code received by the app between the poll interval. |
| HTTP STATUS CODES |
| HTTP 101 - Protocol Switching | The total number of requests resulting in an HTTP 101 status code (Switching protocols) between the poll interval. |
| HTTP 2xx - Success | The total number of requests resulting in an HTTP 2xx status code (Successful response) between the poll interval. |
| HTTP 3xx - Redirection | The total number of requests resulting in an HTTP 3xx status code (Redirection response) between the poll interval. |
| HTTP 4xx - Client Errors | The total number of requests resulting in an HTTP 4xx status code (Client error response) between the poll interval. |
| HTTP 5xx - Server Errors | The total number of requests resulting in an HTTP 5xx status code (Server error response) between the poll interval. |
| HTTP 4XX ERRORS |
| HTTP 401 - Unauthorized | The total number of requests resulting in HTTP 401 (Unauthorized) status code between the poll interval. |
| HTTP 403 - Forbidden | The total number of requests resulting in HTTP 403 (Forbidden) status code between the poll interval. |
| HTTP 404 - Not Found | The total number of requests resulting in HTTP 404 (Not Found) status code between the poll interval. |
| HTTP 406 - Not Acceptable | The total number of requests resulting in HTTP 406 (Not Acceptable) status code between the poll interval. |
OS Statistics
| Parameter | Description |
|---|
| CONNECTIONS |
| No of Connections (Avg) | The average number of bound sockets existing in the sandbox (w3wp.exe and its child processes) between the poll interval. A bound socket is created by calling bind()/connect() APIs and remains until said socket is closed with CloseHandle()/closesocket(). |
| REQUESTS IN APPLICATION QUEUE |
| Requests In Application Queue (Avg) | The average number of requests in the application request queue between the poll interval. |
| PRIVATE BYTES |
| Private Bytes | The average size of memory that the app process has allocated that can't be shared with other processes between the poll interval (in MB). |
| NO OF THREADS (AVG) |
| No of Threads (Avg) | The average number of threads that were active in the app process between the poll interval. |
| IO OTHER THROUGHPUT |
| IO Other Throughput | The average rate at which the app process is issuing bytes to I/O operations that don't involve data, such as control operations between the poll interval (in MB/s). |
| IO OTHER OPERATIONS |
| IO Other Operations Rate | The average rate at which the app process is issuing I/O operations that aren't read or write operations between the poll interval (in MB/s). |
| HANDLES |
| Handles | The average number of handles that are opened by the app process between the poll interval. |
| CURRENT ASSEMBLIES |
| Current Assemblies | The average number of assemblies loaded across all AppDomains in this application between the poll interval. |
| GARBAGE COLLECTIONS |
| Gen 0 GCs | The total number of times the generation 0 objects are garbage collected since the start of the app process between the poll interval. Higher generation GCs include all lower generation GCs. |
| Gen 1 GCs | The total number of times the generation 1 objects are garbage collected since the start of the app process between the poll interval. Higher generation GCs include all lower generation GCs. |
| Gen 2 GCs | The total number of times the generation 2 objects are garbage collected since the start of the app process between the poll interval. |
| APP DOMAINS |
| App Domains Loaded (Avg) | The average number of AppDomains loaded in this application between the poll interval. |
| App Domains Unloaded (Avg) | The average number of AppDomains unloaded since the start of the application between the poll interval. |
Configuration
| Parameter | Description |
|---|
| CONFIGURATION |
| Resource Group Name | The name of the Azure resource group that the App Service Slot belongs to. |
| Location | The Azure region where the App Service Slot is deployed. |
| App Enabled | Indicates whether the App Service Slot is enabled or disabled. |
| Accept Only HTTPs Requests | Indicates whether the App Service Slot is configured to accept only HTTPs requests. |
| Default Host Name | The default hostname associated with the App Service Slot. |
| Last Modified Time | The date and time when the App Service Slot configuration was last modified. |
