Add public-samples/benchmarks-website---replit-yxxvno/infrastructure/…

…terraform/modules/monitoring/variables.tf

infrastructure/terraform/modules/monitoring/variables.tf

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+# terraform v1.0+ required for variable validation features
+terraform {
+  required_version = "~> 1.0"
+}
+
+# Environment variable with strict validation
+variable "environment" {
+  description = "Deployment environment (staging/production) with strict validation"
+  type        = string
+
+  validation {
+    condition     = can(regex("^(staging|production)$", var.environment))
+    error_message = "Environment must be either 'staging' or 'production'"
+  }
+}
+
+# Project name variable for resource naming
+variable "project_name" {
+  description = "Name of the project for resource naming and tagging"
+  type        = string
+  default     = "saas-metrics"
+}
+
+# Prometheus configuration with comprehensive settings
+variable "prometheus_config" {
+  description = "Comprehensive configuration for Prometheus deployment including storage and scraping settings"
+  type = object({
+    retention_period     = string
+    storage_size        = string
+    metrics_port        = number
+    scrape_interval     = string
+    evaluation_interval = string
+    alert_rules_path    = string
+  })
+
+  default = {
+    retention_period     = "15d"
+    storage_size        = "50Gi"
+    metrics_port        = 9090
+    scrape_interval     = "15s"
+    evaluation_interval = "15s"
+    alert_rules_path    = "/etc/prometheus/rules"
+  }
+
+  validation {
+    condition     = can(regex("^[0-9]+[dwy]$", var.prometheus_config.retention_period))
+    error_message = "Retention period must be specified in days (d), weeks (w), or years (y)"
+  }
+
+  validation {
+    condition     = can(regex("^[0-9]+Gi$", var.prometheus_config.storage_size))
+    error_message = "Storage size must be specified in Gigabytes (Gi)"
+  }
+}
+
+# Grafana configuration with authentication and persistence settings
+variable "grafana_config" {
+  description = "Detailed configuration for Grafana deployment including authentication and persistence"
+  type = object({
+    admin_user              = string
+    version                = string
+    dashboard_provider_name = string
+    persistence_size       = string
+    plugins                = list(string)
+    smtp_enabled           = bool
+    auth_providers         = list(string)
+  })
+
+  default = {
+    admin_user              = "admin"
+    version                = "9.0.0"
+    dashboard_provider_name = "saas-metrics"
+    persistence_size       = "10Gi"
+    plugins                = ["grafana-piechart-panel"]
+    smtp_enabled           = false
+    auth_providers         = ["google"]
+  }
+
+  validation {
+    condition     = length(var.grafana_config.admin_user) >= 4
+    error_message = "Admin username must be at least 4 characters long"
+  }
+
+  validation {
+    condition     = can(regex("^[0-9]+\\.[0-9]+\\.[0-9]+$", var.grafana_config.version))
+    error_message = "Grafana version must be in semantic versioning format (x.y.z)"
+  }
+}
+
+# Elasticsearch configuration with performance and security settings
+variable "elasticsearch_config" {
+  description = "Configuration for Elasticsearch deployment with performance and security settings"
+  type = object({
+    version           = string
+    heap_size         = string
+    storage_size      = string
+    replicas          = number
+    security_enabled  = bool
+    snapshot_schedule = string
+  })
+
+  default = {
+    version           = "7.17.0"
+    heap_size         = "1g"
+    storage_size      = "30Gi"
+    replicas          = 3
+    security_enabled  = true
+    snapshot_schedule = "0 0 * * *"
+  }
+
+  validation {
+    condition     = var.elasticsearch_config.replicas >= 1
+    error_message = "Elasticsearch must have at least 1 replica"
+  }
+
+  validation {
+    condition     = can(regex("^[0-9]+[mMgG]$", var.elasticsearch_config.heap_size))
+    error_message = "Heap size must be specified in megabytes (m/M) or gigabytes (g/G)"
+  }
+}
+
+# Kibana configuration with high availability settings
+variable "kibana_config" {
+  description = "Configuration for Kibana deployment including high availability settings"
+  type = object({
+    version              = string
+    replicas             = number
+    security_enabled     = bool
+    default_index_pattern = string
+  })
+
+  default = {
+    version              = "7.17.0"
+    replicas             = 1
+    security_enabled     = true
+    default_index_pattern = "logs-*"
+  }
+
+  validation {
+    condition     = var.kibana_config.version == var.elasticsearch_config.version
+    error_message = "Kibana version must match Elasticsearch version"
+  }
+
+  validation {
+    condition     = var.kibana_config.replicas >= 1
+    error_message = "Kibana must have at least 1 replica"
+  }
+}
+
+# Monitoring namespace configuration
+variable "monitoring_namespace" {
+  description = "Kubernetes namespace for monitoring components with isolation"
+  type        = string
+  default     = "monitoring"
+
+  validation {
+    condition     = can(regex("^[a-z0-9-]+$", var.monitoring_namespace))
+    error_message = "Namespace must consist of lowercase alphanumeric characters or '-'"
+  }
+}