docs: Provide example Terraform variables

Author: bogdan-ts

terraform/aws/terraform.tfvars.example

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+# AWS Deployment Configuration
+# Copy to terraform.tfvars and customize
+
+# REQUIRED PARAMETERS
+# -------------------------
+
+# SSH key for EC2 access (create in AWS Console or CLI)
+ssh_key_name = "your-key-name"
+
+# Grafana password (minimum 8 characters)
+grafana_password = "YourSecurePassword123!"
+
+
+# AWS SETTINGS
+# -------------------------
+
+# AWS region
+aws_region = "us-east-1"
+
+# Environment
+environment = "production"
+
+# EC2 instance type
+# t3.medium  - 2 vCPU, 4 GiB  - for 1-3 databases
+# t3.large   - 2 vCPU, 8 GiB  - for 3-10 databases (recommended)
+# t3.xlarge  - 4 vCPU, 16 GiB - for 10+ databases
+instance_type = "t3.large"
+
+# EBS volume size for data (GiB)
+data_volume_size = 100
+
+
+# SECURITY
+# -------------------------
+
+# CIDR blocks for SSH access (restrict to your IP in production)
+allowed_ssh_cidr = [
+  "0.0.0.0/0"  # WARNING: Allows access from anywhere
+  # "203.0.113.0/24"  # Replace with your office/VPN IP
+]
+
+# CIDR blocks for Grafana access (restrict to your IP in production)
+allowed_cidr_blocks = [
+  "0.0.0.0/0"  # WARNING: Allows access from anywhere
+  # "203.0.113.0/24"  # Replace with your office/VPN IP
+]
+
+# Allocate Elastic IP for stable address
+use_elastic_ip = true
+
+
+# POSTGRESQL MONITORING
+# -------------------------
+
+# PostgreSQL instances to monitor
+monitoring_instances = [
+  {
+    name        = "production-db"
+    conn_str    = "postgresql://monitor:password@db.example.com:5432/postgres"
+    environment = "production"
+    cluster     = "main"
+    node_name   = "primary"
+  },
+  # {
+  #   name        = "production-replica"
+  #   conn_str    = "postgresql://monitor:password@replica.example.com:5432/postgres"
+  #   environment = "production"
+  #   cluster     = "main"
+  #   node_name   = "replica-1"
+  # }
+]
+
+
+# OPTIONAL PARAMETERS
+# -------------------------
+
+# PostgresAI API key (for uploading reports to cloud)
+# 
+# How to get API key:
+# 1. Register at https://console.postgres.ai
+# 2. Go to: Your Organization → Manage → Access Tokens
+# 3. Create new token and copy it here
+#
+# If not set, reports will be generated locally without upload
+# postgres_ai_api_key = "your-api-key-here"
+
+# Enable demo database (for testing)
+# enable_demo_db = false
+
+
+# CONFIGURATION EXAMPLES
+# -------------------------
+
+# Minimal configuration (for testing):
+# ------------------------------------
+# instance_type = "t3.medium"
+# data_volume_size = 50
+# enable_demo_db = true
+# monitoring_instances = []
+
+# Production configuration:
+# -------------------------
+# instance_type = "t3.xlarge"
+# data_volume_size = 200
+# allowed_ssh_cidr = ["10.0.0.0/8"]
+# allowed_cidr_blocks = ["10.0.0.0/8"]
+# use_elastic_ip = true
+
+# Minimal configuration (dev/test):
+# ----------------------------------
+# instance_type = "t3.small"  # WARNING: May be slow for production use
+# data_volume_size = 30
+# use_elastic_ip = false