What is the MOST LIKELY cause for AWS X-Ray not showing any data for the Lambda function?
The AWS SDK needs to be included in the AWS Lambda deployment package.
VPC Flow Logs are not enabled for the application VPC.
Active tracing needs to be enabled for the Lambda function.
The memory needs to be increased to 2 GB for the TEST environments.
Explanations:
The AWS SDK is not required to be included in the Lambda deployment package for X-Ray to work. AWS Lambda automatically includes the AWS SDK in the execution environment. Therefore, this option does not address the issue of X-Ray not showing data.
VPC Flow Logs provide visibility into the network traffic within a VPC but do not directly affect AWS X-Ray. X-Ray data is related to tracing requests and responses within AWS services, and VPC Flow Logs do not influence the X-Ray tracing functionality.
Active tracing must be enabled for the Lambda function to send tracing data to AWS X-Ray. If active tracing is not enabled, the Lambda function will not appear in the X-Ray service graph, which explains why no data is being shown for the function in the TEST environment.
Increasing the memory allocation to 2 GB may improve performance, but it does not affect the ability of AWS X-Ray to collect and display data. The memory setting does not impact whether X-Ray tracing is enabled or functioning.
I conclude that the answer is:
Active tracing needs to be enabled for the Lambda function.