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This update introduces four types of credential providers: 1. Environment variables 2. Configuration file 3. AWS STS 4. EC2 Metadata service The first two providers should only be used for testing and local runs. **They must NEVER be used in production.** The last two providers are intended for use on real EC2 instances: - **AWS STS**: Preferred method for obtaining temporary credentials using IAM roles. - **EC2 Metadata Service**: Should be used as a last resort. Additionally, a simple credentials provider chain is created. It queries each provider sequentially until valid credentials are obtained. If all providers fail, it returns an empty result. fixes: #21828 Closes scylladb/scylladb#21830 * github.com:scylladb/scylladb: docs: update the `object_storage.md` and `admin.rst` aws creds: add STS and Instance Metadata service credentials providers aws creds: add env. and file credentials providers s3 creds: move credentials out of endpoint config