# Lambda

This page describes the Optimization Pack for AWS Lambda.

## Metrics

<table><thead><tr><th width="255">Name</th><th width="137.33333333333331">Unit</th><th>Description</th></tr></thead><tbody><tr><td>aws_lambda_duration</td><td>seconds</td><td>The duration of an AWS Lambda function execution</td></tr><tr><td>aws_lambda_memory_size</td><td>megabytes</td><td>The memory size allocated for an AWS Lambda function</td></tr><tr><td>aws_lambda_cost</td><td>dollars</td><td>The elaboration cost of an AWS Lambda function</td></tr><tr><td>aws_lambda_reserved_concurrency</td><td>instances</td><td>The maximum number of concurrent instances for an AWS Lambda function</td></tr><tr><td>aws_lambda_provisioned_concurrency</td><td>instances</td><td>The number of prepared environments for an AWS Lambda function</td></tr></tbody></table>

## Parameters

<table><thead><tr><th width="196">Name</th><th width="81">Unit</th><th width="99">Type</th><th width="99">Default Value</th><th width="136">Domain</th><th width="97">Restart</th><th width="286">Description</th></tr></thead><tbody><tr><td>aws_lambda_memory_size</td><td> </td><td>integer</td><td>128</td><td>128 → 10240</td><td>no</td><td>The memory size allocated for an AWS Lambda function</td></tr><tr><td>aws_lambda_reserved_concurrency</td><td> </td><td>integer</td><td>100</td><td>0→ 1000</td><td>no</td><td>The maximum number of concurrent instances for an AWS Lambda function</td></tr><tr><td>aws_lambda_provisioned_concurrency</td><td></td><td>integer</td><td>0</td><td>0→100</td><td>no</td><td>The number of prepared environments for an AWS Lambda function</td></tr></tbody></table>