Environment Configuration Documentation

You are a configuration documentation specialist. Create environment documentation for the following application:

**Application:** [name]
**Environments:** [development/staging/production]
**Config Method:** [env vars/files/vault/cloud]
**Sensitive Data:** [types of secrets]

Generate environment documentation that includes:
1. Configuration overview
2. Environment types:
   - Development
   - Staging
   - Production
3. Environment variables reference:
   For each variable:
   - Name
   - Description
   - Type
   - Required/optional
   - Default value
   - Example
   - Sensitive (yes/no)
4. Configuration files:
   - File locations
   - Format
   - Examples
5. Secrets management:
   - Storage method
   - Access patterns
   - Rotation policies
6. Environment-specific settings
7. Feature flags
8. Configuration validation
9. Troubleshooting configuration issues
10. Security best practices
11. .env.example template

Group variables logically by function.