add validation rules to monitoring variables

monitoring/README.md

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+---
+display_name: Monitoring
+description: Monitoring of workspace resources
+maintainer_github: coder
+verified: true
+tags: [monitoring]
+---
+
+# Monitoring
+
+This module adds monitoring of workspace resources.
+
+```tf
+module "monitoring" {
+  source  = "registry.coder.com/modules/monitoring/coder"
+  version = "1.0.0"
+  agent_id = coder_agent.dev.id
+}
+```
+
+## Examples
+
+```tf
+module "monitoring" {
+  source  = "registry.coder.com/modules/monitoring/coder"
+  version = "1.0.0"
+  agent_id = coder_agent.dev.id
+}
+```
+
+### Enable/Disable
+
+You can customize the monitoring by setting the `enabled`, `memory_enabled`, and `disk_enabled` variables.
+
+```tf
+module "monitoring" {
+  source  = "registry.coder.com/modules/monitoring/coder"
+  version = "1.0.0"
+  agent_id = coder_agent.dev.id
+  enabled = false
+  memory_enabled = true
+  disk_enabled = false
+}
+```
+
+### Customize Thresholds
+
+You can customize the thresholds by setting the `threshold`, `memory_threshold`, and `disk_threshold` variables.
+
+```tf
+module "monitoring" {
+  source  = "registry.coder.com/modules/monitoring/coder"
+  version = "1.0.0"
+  agent_id = coder_agent.dev.id
+  threshold = 90
+  memory_threshold = 95
+  disk_threshold = 90
+}
+```
+
+### Customize Disks
+
+You can customize the disks by setting the `disks` variable.
+
+```tf
+module "monitoring" {
+  source  = "registry.coder.com/modules/monitoring/coder"
+  version = "1.0.0"
+  agent_id = coder_agent.dev.id
+  disks = ["/"]
+}
+```

monitoring/main.tf

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+terraform {
+  required_version = ">= 1.0.25"
+
+  required_providers {
+    coder = {
+      source  = "coder/coder"
+      version = ">= 2.0.2"
+    }
+  }
+}
+
+variable "threshold" {
+  type        = number
+  description = "The threshold for the monitoring, used for all resources unless overridden by *_threshold - expressed as a percentage."
+  default     = 90
+  validation {
+    condition     = var.threshold >= 0 && var.threshold <= 100
+    error_message = "The threshold must be between 0 and 100."
+  }
+}
+
+variable "memory_threshold" {
+  type        = number
+  description = "The threshold for the memory monitoring - expressed as a percentage."
+  default     = 90
+  validation {
+    condition     = var.memory_threshold >= 0 && var.memory_threshold <= 100
+    error_message = "The memory_threshold must be between 0 and 100."
+  }
+}
+
+variable "disk_threshold" {
+  type        = number
+  description = "The threshold for the disk monitoring - expressed as a percentage."
+  default     = 90
+  validation {
+    condition     = var.disk_threshold >= 0 && var.disk_threshold <= 100
+    error_message = "The disk_threshold must be between 0 and 100."
+  }
+}
+
+variable "disks" {
+  type        = list(string)
+  description = "The disks to monitor. e.g. ['/', '/home']"
+  default     = ["/"]
+}
+
+variable "enabled" {
+  type        = bool
+  description = "Whether the monitoring is enabled."
+  default     = true
+  validation {
+    condition     = var.enabled == true || var.enabled == false
+    error_message = "The enabled must be true or false."
+  }
+}
+
+variable "memory_enabled" {
+  type        = bool
+  description = "Whether the memory monitoring is enabled."
+  default     = true
+  validation {
+    condition     = var.memory_enabled == true || var.memory_enabled == false
+    error_message = "The memory_enabled must be true or false."
+  }
+}
+
+variable "disk_enabled" {
+  type        = bool
+  description = "Whether the disk monitoring is enabled."
+  default     = true
+  validation {
+    condition     = var.disk_enabled == true || var.disk_enabled == false
+    error_message = "The disk_enabled must be true or false."
+  }
+}
+
+variable "agent_id" {
+  type        = string
+  description = "The ID of the agent to monitor."
+}
+
+data "coder_monitoring" "monitoring" {
+  threshold    = var.threshold
+  memory_threshold = var.memory_threshold
+  disk_threshold = var.disk_threshold
+  disks = var.disks
+  enabled = var.enabled
+  memory_enabled = var.memory_enabled
+  disk_enabled = var.disk_enabled
+  agent_id = var.agent_id
+}