refactoring alerts and dashboard code (#16)

alerts/rds_alerts/providers.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    dynatrace = {
+      version = "~> 1.0"
+      source  = "dynatrace-oss/dynatrace"
+    }
+  }
+}

alerts/rds_alerts/rds_alerts.tf

@@ -0,0 +1,35 @@
+resource "dynatrace_alerting" "cosmos-rds-alerting-profile" {
+  name            = var.rds_alerting_profile_name
+  rules {
+    rule {
+      include_mode     = var.rds_include_mode
+      delay_in_minutes = var.rds_delay_in_minutes
+      severity_level   = "AVAILABILITY"
+    }
+    rule {
+      include_mode     = var.rds_include_mode
+      delay_in_minutes = var.rds_delay_in_minutes
+      severity_level   = "CUSTOM_ALERT"
+    }
+    rule {
+      include_mode     = var.rds_include_mode
+      delay_in_minutes = var.rds_delay_in_minutes
+      severity_level   = "ERRORS"
+    }
+    rule {
+      include_mode     = var.rds_include_mode
+      delay_in_minutes = var.rds_delay_in_minutes
+      severity_level   = "MONITORING_UNAVAILABLE"
+    }
+    rule {
+      include_mode     = var.rds_include_mode
+      delay_in_minutes = var.rds_delay_in_minutes
+      severity_level   = "PERFORMANCE"
+    }
+    rule {
+      include_mode     = var.rds_include_mode
+      delay_in_minutes = var.rds_delay_in_minutes
+      severity_level   = "RESOURCE_CONTENTION"
+    }
+  }
+}