added grafana module

grafana/alerts/locals.tf

@@ -0,0 +1,46 @@
+locals {
+  #################################################################
+  # 1. Discover & decode alert YAML files from <root>/<alerts_dir>
+  #################################################################
+  alert_files = fileset(
+    "${path.root}/${var.alerts_dir}",
+    var.file_pattern
+  )
+
+  decoded_files = [
+    for f in local.alert_files :
+    yamldecode(file("${path.root}/${var.alerts_dir}/${f}"))
+  ]
+
+  #################################################################
+  # 2. Flatten: each file may contain multiple groups
+  #################################################################
+  groups_raw = flatten([
+    for doc in local.decoded_files : try(doc.groups, [])
+  ])
+
+  #################################################################
+  # 3. Merge defaults & convert camelCase → snake_case
+  #################################################################
+  groups = [
+    for g in local.groups_raw : merge(g, {
+      uid = try(
+        g.uid,
+        trim(replace(replace(lower(g.name), " ", "-"), "_", "-"), "-")
+      )
+      folder_uid = try(try(g.folder_uid, g.folder), var.default_folder_uid)
+      interval   = try(g.interval, "1m")
+
+      rules = [
+        for r in g.rules : merge(r, {
+          data = [
+            for d in r.data : merge(d, {
+              datasource_uid      = try(d.datasourceUid, var.default_datasource_uid)
+              relative_time_range = try(d.relativeTimeRange, { from = 600, to = 0 })
+            })
+          ]
+        })
+      ]
+    })
+  ]
+}

grafana/alerts/main.tf

@@ -0,0 +1,51 @@
+resource "grafana_rule_group" "this" {
+  for_each = {
+    for g in local.groups :
+    g.uid => g
+  }
+
+  name       = each.value.name
+  folder_uid = each.value.folder_uid
+
+  interval_seconds = (
+    substr(each.value.interval, length(each.value.interval) - 1, 1) == "m"
+    ? tonumber(substr(each.value.interval, 0, length(each.value.interval) - 1)) * 60
+    : tonumber(trim(each.value.interval, "s"))
+  )
+
+  disable_provenance = var.disable_provenance
+
+  dynamic "rule" {
+    for_each = each.value.rules
+    content {
+      uid       = rule.value.uid
+      name      = try(rule.value.title, rule.value.name)
+      condition = rule.value.condition
+
+      no_data_state  = rule.value.noDataState
+      exec_err_state = rule.value.execErrState
+      is_paused      = try(rule.value.isPaused, false)
+      for            = try(rule.value.for, null)
+
+      labels = try(rule.value.labels, {})
+
+      dynamic "data" {
+        for_each = rule.value.data
+        content {
+          ref_id         = data.value.refId
+          datasource_uid = data.value.datasource_uid
+
+          dynamic "relative_time_range" {
+            for_each = [data.value.relative_time_range]
+            content {
+              from = relative_time_range.value.from
+              to   = relative_time_range.value.to
+            }
+          }
+
+          model = jsonencode(data.value.model)
+        }
+      }
+    }
+  }
+}

grafana/alerts/output.tf

@@ -0,0 +1,4 @@
+output "rule_group_ids" {
+  description = "Map: <folder_uid>.<name> → Grafana rule-group ID"
+  value       = { for k, v in grafana_rule_group.this : k => v.id }
+}

grafana/alerts/providers.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    grafana = {
+      source  = "grafana/grafana"
+      version = "= 3.25.4"
+    }
+  }
+}

grafana/alerts/variables.tf

@@ -0,0 +1,38 @@
+variable "alerts_dir" {
+  type        = string
+  default     = "alerts"
+  description = "Relative path to the directory containing alert rule YAML files."
+}
+
+variable "file_pattern" {
+  type        = string
+  default     = "*.y{a,}ml"
+  description = "Glob pattern to match alert rule YAML files (e.g. *.yaml, *.yml)."
+}
+
+variable "default_datasource_uid" {
+  type        = string
+  description = "UID of the Prometheus or Thanos datasource to use if not specified in the alert rule."
+}
+
+variable "default_receiver" {
+  type        = string
+  description = "Name of the contact point (receiver) to use for notifications if not defined in alert rule."
+}
+
+variable "default_folder_uid" {
+  type        = string
+  description = "UID of the Grafana folder to use for alert rules when not defined in the YAML."
+}
+
+variable "default_interval_seconds" {
+  type        = number
+  default     = 60
+  description = "Default evaluation interval (in seconds) for alert rule groups if not set in YAML."
+}
+
+variable "disable_provenance" {
+  type        = bool
+  default     = false
+  description = "If true, disables Grafana alert provisioning provenance (sets disable_provenance = true)."
+}