Metrics for resource performance in Azure - Mini Project: Build & Apply

Metrics for resource performance

📖 Scenario: You are managing cloud resources in Microsoft Azure. To keep your resources healthy and efficient, you want to collect performance metrics like CPU usage and memory usage.This project will guide you to create a simple Azure Monitor metrics query to check resource performance.

🎯 Goal: Build an Azure Monitor metrics query that retrieves CPU and memory usage metrics for a specific virtual machine resource.

📋 What You'll Learn

Create a variable with the resource ID of the virtual machine

Define a time range for the metrics query

Write a metrics query to get CPU and memory usage

Configure the query to return average values

💡 Why This Matters

🌍 Real World

Monitoring cloud resources is essential to ensure they run efficiently and to detect problems early. Azure Monitor metrics help track resource health and performance.

💼 Career

Cloud engineers and administrators use metrics queries to analyze resource usage and optimize costs and performance.

1

Set the resource ID variable

Create a variable called resource_id and set it to the exact string "/subscriptions/12345678-1234-1234-1234-123456789abc/resourceGroups/MyResourceGroup/providers/Microsoft.Compute/virtualMachines/MyVM".

Azure

# Your code here

Hint

The resource ID is a long string that uniquely identifies your VM in Azure.

2

Define the time range for metrics

Create a variable called time_range and set it to the string "PT1H" which means the last 1 hour.

Azure

resource_id = "/subscriptions/12345678-1234-1234-1234-123456789abc/resourceGroups/MyResourceGroup/providers/Microsoft.Compute/virtualMachines/MyVM"
# Your code here

Hint

Use ISO 8601 duration format for the time range.

3

Write the metrics query

Create a variable called metrics_query and set it to the string "metrics?timespan=PT1H&metricnames=Percentage CPU,Available Memory Bytes&aggregation=Average" to query average CPU and memory usage for the last hour.

Azure

resource_id = "/subscriptions/12345678-1234-1234-1234-123456789abc/resourceGroups/MyResourceGroup/providers/Microsoft.Compute/virtualMachines/MyVM"
time_range = "PT1H"
# Your code here

Hint

The query string includes timespan, metric names, and aggregation type.

4

Complete the Azure Monitor metrics request URL

Create a variable called request_url that combines resource_id and metrics_query with a slash between them.

Azure

resource_id = "/subscriptions/12345678-1234-1234-1234-123456789abc/resourceGroups/MyResourceGroup/providers/Microsoft.Compute/virtualMachines/MyVM"
time_range = "PT1H"
metrics_query = "metrics?timespan=PT1H&metricnames=Percentage CPU,Available Memory Bytes&aggregation=Average"
# Your code here

Hint

Use string concatenation with a slash to build the full request URL.

Practice

1. What is the main purpose of metrics in Azure resource performance monitoring?

easy

A. To create new Azure resources automatically

B. To change resource configurations

C. To delete unused resources

D. To track how well resources are working over time

Solution

1. Step 1: Understand what metrics represent

   Metrics provide data about resource usage and performance over time.

2. Step 2: Identify the purpose of monitoring metrics

   Monitoring helps keep resources healthy and plan for future needs.

3. Final Answer:

   To track how well resources are working over time -> Option D

4. Quick Check:

   Metrics = Performance tracking [OK]

Hint: Metrics measure performance, not resource creation or deletion [OK]

Common Mistakes:

• Confusing metrics with resource management actions
• Thinking metrics change resource settings
• Assuming metrics create or delete resources

2. Which Azure CLI command correctly lists metrics for a resource?

easy

A. az metrics get --resource-group

B. az resource metrics show --name

C. az monitor metrics list --resource

D. az monitor resource metrics fetch --id

Solution

1. Step 1: Recall the correct Azure CLI syntax for metrics

   The official command to list metrics is az monitor metrics list with the resource specified.

2. Step 2: Verify the options

   Only az monitor metrics list --resource uses the correct command and parameter format.

3. Final Answer:

   az monitor metrics list --resource <resource-id> -> Option C

4. Quick Check:

   Correct CLI command = az monitor metrics list --resource [OK]

Hint: Use 'az monitor metrics list' to get metrics data [OK]

Common Mistakes:

• Using incorrect command verbs like 'get' or 'show'
• Mixing resource and resource-group parameters wrongly
• Adding unsupported flags or commands

3. Given this Azure CLI command output snippet for CPU percentage metric:

{"value": [{"timeseries": [{"data": [{"timeStamp": "2024-06-01T10:00:00Z", "average": 30.5}, {"timeStamp": "2024-06-01T10:05:00Z", "average": 45.2}]}]}]}

What is the average CPU usage at 10:05 AM?

medium

A. 45.2%

B. No data available

C. 75.7%

D. 30.5%

Solution

1. Step 1: Locate the timestamp 10:05 AM in the data

   Find the entry with "timeStamp": "2024-06-01T10:05:00Z".

2. Step 2: Read the average CPU value at that time

   The average value is 45.2% at 10:05 AM.

3. Final Answer:

   45.2% -> Option A

4. Quick Check:

   CPU at 10:05 = 45.2% [OK]

Hint: Match timestamp exactly to find correct metric value [OK]

Common Mistakes:

• Picking the wrong timestamp value
• Adding values instead of reading single entry
• Confusing average with total or max

4. You run az monitor metrics list --resource <id> but get an error: "Resource not found". What is the most likely cause?

medium

A. Metrics are not enabled for the resource

B. The resource ID is incorrect or does not exist

C. You forgot to login to Azure CLI

D. The command syntax is wrong

Solution

1. Step 1: Understand the error message

   "Resource not found" means Azure cannot locate the resource by the given ID.

2. Step 2: Identify common causes

   An incorrect or non-existent resource ID is the most common reason for this error.

3. Final Answer:

   The resource ID is incorrect or does not exist -> Option B

4. Quick Check:

   Resource not found = Wrong ID [OK]

Hint: Check resource ID spelling and existence first [OK]

Common Mistakes:

• Assuming metrics must be enabled to avoid this error
• Ignoring login status
• Blaming command syntax without checking resource ID

5. You want to monitor the average disk read bytes for a virtual machine over the last 24 hours using Azure CLI. Which command correctly achieves this?

hard

A. az monitor metrics list --resource --metric DiskReadBytes --interval PT24H --aggregation Average

B. az monitor metrics list --resource --metric DiskReadBytes --interval 24h --aggregation Total

C. az monitor metrics show --resource --metric DiskReadBytes --time-range 24h --aggregation Average

D. az metrics list --resource --metric DiskReadBytes --interval PT24H --aggregation Average

Solution

1. Step 1: Identify the correct command and parameters

   The command to list metrics is az monitor metrics list. The metric name is DiskReadBytes. The interval uses ISO 8601 duration format (PT24H for 24 hours). Aggregation for average is 'Average'.

2. Step 2: Compare options for correctness

   az monitor metrics list --resource --metric DiskReadBytes --interval PT24H --aggregation Average uses correct command, metric, interval format, and aggregation. Others have wrong commands, interval formats, or aggregation types.

3. Final Answer:

   az monitor metrics list --resource <vm-resource-id> --metric DiskReadBytes --interval PT24H --aggregation Average -> Option A

4. Quick Check:

   Correct CLI + metric + interval + aggregation = az monitor metrics list --resource --metric DiskReadBytes --interval PT24H --aggregation Average [OK]

Hint: Use ISO 8601 interval format and 'Average' aggregation [OK]

Common Mistakes:

• Using wrong command like 'az metrics show'
• Using incorrect interval format like '24h'
• Choosing 'Total' instead of 'Average' aggregation