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If you are looking for a free solution to monitor your Amazon S3 storage, using S3 Storage Lens (Free Tier) is probably your best “out-of-the-box” option. It’s simple to set up and doesn’t cost anything, making it a good starting point. However, keep in mind that it updates data only once every 24 hours, which might not work if you need near real-time information.
One common mistake is thinking that objects moved to S3 Glacier or Deep Archive can be checked instantly. In reality, these objects are “archived,” meaning they are not immediately accessible in detail. While listing objects in your bucket will show their names, you won’t get complete metadata—like size or storage class—without restoring them first. Restoring takes time and can incur costs, so it’s not efficient to try to get real-time data this way if you have many archived objects.
The best way to get metadata for large amounts of archived data without high costs is to use the S3 Inventory feature. This tool generates a regular report—daily or weekly—that includes details like object size and storage class for all items, even those in Deep Archive. The reports come as flat files (CSV, ORC, or Parquet), which you can analyze at your convenience. This method avoids the overhead and costs of making thousands of individual API calls.
Remember, S3 is designed as an object store, not a file system. It’s not practical to scan all metadata constantly for real-time updates because that consumes a lot of compute power and costs money.
If quick updates are essential, there are two options to consider:
First, an “event-driven” approach involves setting up a monitoring pipeline that tracks changes as they happen. This method can provide up-to-date information and is often included in the AWS Free Tier. You’d run a one-time inventory report initially to get your starting point, then use events and Lambda functions to update your data in real time.
Second, avoid manually running CLI commands like “ls –recursive” on large buckets. These commands can be very costly because each list request costs money, and scanning millions of objects can add up quickly. Plus, this process is slow and can take hours.
As an alternative, if you’re willing to spend a small amount monthly, AWS S3 Storage Lens Advanced offers frequent updates and detailed insights published to CloudWatch. It costs around $0.20 per million objects each month. For example, if you have five million objects, paying just $1 a month gives you much better insight than the free tier, without complex setup.
In summary, if you need a zero-cost solution, the standard Storage Lens with a 24-hour delay is your only option. But if you want near real-time updates, the best approach within the free limits is to combine event-driven monitoring with Lambda functions and DynamoDB to keep your data current without incurring high costs.
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