main.tf

resource "aws_cloudwatch_log_metric_filter" "metric_filter" {
  log_group_name = var.log_group_name
  metric_transformation {
    name = "${var.metric_filter_name != "" ? var.metric_filter_name : var.alarm_name}"
    namespace = var.metric_namespace
    value = "1"
  }
  name = "${var.metric_filter_name != "" ? var.metric_filter_name : var.alarm_name}"
  pattern = var.pattern
}

resource "aws_cloudwatch_metric_alarm" "metric_alarm" {
  alarm_name = var.alarm_name
  comparison_operator = var.comparison_operator
  evaluation_periods = var.evaluation_periods
  metric_name = aws_cloudwatch_log_metric_filter.metric_filter.name
  namespace = var.metric_namespace
  period = var.period
  threshold = var.threshold
  statistic = var.statistic
  alarm_actions = var.alarm_action_arns
}