AWS Lambda measures your usage time with a metric called GB-second.
Every month you are given 1M free requests, and 400.000 GB-seconds.
GB-seconds are the number of seconds your function runs for, multiplied by the amount of RAM memory consumed.
It’s a computed metrics, calculated multiplying two other metrics, and it’s a reasonable way to measure how many resources your serverless functions consume, in relation to time and memory.
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