fix: Prevent panic in GetMetrics gRPC handler on invalid input (#1291)

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>

crates/credentials/README.md

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+[![RustFS](https://rustfs.com/images/rustfs-github.png)](https://rustfs.com)
+
+# RustFS Credentials - Credential Management Module
+
+<p align="center">
+  <strong>A module for managing credentials within the RustFS distributed object storage system.</strong>
+</p>
+
+<p align="center">
+  <a href="https://github.com/rustfs/rustfs/actions/workflows/ci.yml"><img alt="CI" src="https://github.com/rustfs/rustfs/actions/workflows/ci.yml/badge.svg" /></a>
+  <a href="https://docs.rustfs.com/">📖 Documentation</a>
+  · <a href="https://github.com/rustfs/rustfs/issues">🐛 Bug Reports</a>
+  · <a href="https://github.com/rustfs/rustfs/discussions">💬 Discussions</a>
+</p>
+
+---
+
+This module provides a secure and efficient way to handle various types of credentials,
+such as API keys, access tokens, and cryptographic keys, required for interacting with
+the RustFS ecosystem and external services.
+
+## 📖 Overview
+
+**RustFS Credentials** is a module dedicated to managing credentials for the [RustFS](https://rustfs.com) distributed
+object storage system. For the complete RustFS experience,
+please visit the [main RustFS repository](https://github.com/rustfs/rustfs)
+
+## ✨ Features
+
+- Secure storage and retrieval of credentials
+- Support for multiple credential types (API keys, tokens, etc.)
+- Encryption of sensitive credential data
+- Integration with external secret management systems
+- Easy-to-use API for credential management
+- Credential rotation and expiration handling
+
+## 📚 Documentation
+
+For comprehensive documentation, examples, and usage guides, please visit the
+main [RustFS repository](https://github.com/rustfs/rustfs).
+
+## 📄 License
+
+This project is licensed under the Apache License 2.0 - see the [LICENSE](../../LICENSE) file for details.