Configure Alert for Large Number of User Signups

This article provides two methods for tracking user signups with the goal of configuring 3rd party alerting based on unusual activity.

• Logs
• User Signups

1. Log streaming: One option is to stream logs to an analytics tool and configure 3rd party alerts based on the resulting user sign-ups indicated in the logs.
2. Extensibility: Create a post-user registration actions trigger that calls an external API that increments a counter on a database.
   • The following example provides a proof of concept that could perform this action:

const axios = require("axios");
const MAX_USER_COUNT = 50000;

exports.onExecutePreUserRegistration = async (event, api) => {
  const userCount = await axios.get("https://my-api.exampleco.com/userCount");
  if (userCount > MAX_USER_COUNT) {
    api.access.deny("Registration limit reached.", "Registration is limited to 50,000 users.")
    return;
  }
  await axios.post("https://my-api.exampleco.com/userSignup", { inc: 1 });
};