POL-1392 AWS Rightsize RDS Instances: Downsize Multiple Tiers

cost/aws/rightsize_rds_instances/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## v5.5.0
+
+- Added support for downsizing multiple sizes where appropriate
+
 ## v5.4.2
 
 - Minor code improvements to conform with current standards. Functionality unchanged.

cost/aws/rightsize_rds_instances/README.md

@@ -41,6 +41,7 @@ This policy has the following input parameters required when launching the polic
   - `Key=~/Regex/` - Filter all resources where the value for the specified key matches the specified regex string.
   - `Key!~/Regex/` - Filter all resources where the value for the specified key does not match the specified regex string. This will also filter all resources missing the specified tag key.
 - *Exclusion Tags: Any / All* - Whether to filter instances containing any of the specified tags or only those that contain all of them. Only applicable if more than one value is entered in the `Exclusion Tags` field.
+- *Skip Instance Sizes* - Whether to recommend downsizing multiple sizes. When set to 'No', only the next smaller size will ever be recommended for downsizing. When set to 'Yes', more aggressive downsizing recommendations will be made when appropriate.
 - *Report Unused or Underutilized* - Whether to report on unused instances, underutilized instances, or both. If both are selected, unused instances will not appear in the list of underutilized instances regardless of CPU usage.
 - *Underutilized Instance CPU Threshold (%)* - The CPU threshold at which to consider an instance to be underutilized and therefore be flagged for downsizing.
 - *Statistic Lookback Period* - How many days back to look at statistical data for instances to determine if they are underutilized or unused. This value cannot be set higher than 90 because AWS does not retain metrics for longer than 90 days.

cost/aws/rightsize_rds_instances/aws_rightsize_rds_instances.pt

@@ -7,7 +7,7 @@ severity "low"
 category "Cost"
 default_frequency "weekly"
 info(
-  version: "5.4.2",
+  version: "5.5.0",
   provider: "AWS",
   service: "RDS",
   policy_set: "Rightsize Database Instances",
@@ -43,6 +43,15 @@ parameter "param_min_savings" do
   default 0
 end
 
+parameter "param_downsize_multiple" do
+  type "string"
+  category "Policy Settings"
+  label "Skip Instance Sizes"
+  description "Whether to recommend downsizing multiple sizes. When set to 'No', only the next smaller size will ever be recommended for downsizing. When set to 'Yes', more aggressive downsizing recommendations will be made when appropriate."
+  allowed_values "Yes", "No"
+  default "No"
+end
+
 parameter "param_regions_allow_or_deny" do
   type "string"
   category "Filters"
@@ -1164,146 +1173,145 @@ EOS
 end
 
 datasource "ds_rds_nonidle_instances_with_metrics" do
-  run_script $js_rds_nonidle_instances_with_metrics, $ds_rds_nonidle_instances, $ds_cloudwatch_underutil_cpu_sorted, $ds_cloudwatch_underutil_mem_sorted, $ds_cloudwatch_underutil_netin_sorted, $ds_cloudwatch_underutil_netout_sorted, $ds_instance_costs_grouped, $ds_aws_instance_size_map
+  run_script $js_rds_nonidle_instances_with_metrics, $ds_rds_nonidle_instances, $ds_cloudwatch_underutil_cpu_sorted, $ds_cloudwatch_underutil_mem_sorted, $ds_cloudwatch_underutil_netin_sorted, $ds_cloudwatch_underutil_netout_sorted
 end
 
 script "js_rds_nonidle_instances_with_metrics", type: "javascript" do
-  parameters "ds_rds_nonidle_instances", "ds_cloudwatch_underutil_cpu_sorted", "ds_cloudwatch_underutil_mem_sorted", "ds_cloudwatch_underutil_netin_sorted", "ds_cloudwatch_underutil_netout_sorted", "ds_instance_costs_grouped", "ds_aws_instance_size_map"
+  parameters "ds_rds_nonidle_instances", "ds_cloudwatch_underutil_cpu_sorted", "ds_cloudwatch_underutil_mem_sorted", "ds_cloudwatch_underutil_netin_sorted", "ds_cloudwatch_underutil_netout_sorted"
   result "result"
   code <<-EOS
   // Merge original instance list with cloudwatch data into a single list
   result = []
 
   _.each(ds_rds_nonidle_instances, function(instance) {
     region = instance['region']
-    id = instance['instanceId']
     cloudwatch_name = instance['name'].toLowerCase()
-    resourceType = instance['resourceType']
-    newResourceType = null
-
-    if (typeof(ds_aws_instance_size_map[resourceType]) == 'object') {
-      newResourceType = ds_aws_instance_size_map[resourceType]["down"]
-    }
 
     // Only proceed if the CloudWatch data actually has the region and instance id.
     // Otherwise, we have no usage data on the instance and thus dont include it in the results.
-    if (ds_cloudwatch_underutil_cpu_sorted[region] != undefined) {
-      if (ds_cloudwatch_underutil_cpu_sorted[region][cloudwatch_name] != undefined) {
-        instance_cpu_metrics = ds_cloudwatch_underutil_cpu_sorted[region][cloudwatch_name]
-        instance_mem_metrics = ds_cloudwatch_underutil_mem_sorted[region][cloudwatch_name]
-        instance_netin_metrics = ds_cloudwatch_underutil_netin_sorted[region][cloudwatch_name]
-        instance_netout_metrics = ds_cloudwatch_underutil_netout_sorted[region][cloudwatch_name]
-
-        savings = 0.0
-
-        if (typeof(newResourceType) == 'string') {
-          cost_name = "db:" + instance['name'].toLowerCase()
-          cost = 0.0
+    if (ds_cloudwatch_underutil_cpu_sorted[region] && ds_cloudwatch_underutil_cpu_sorted[region][cloudwatch_name]) {
+      instance_cpu_metrics = ds_cloudwatch_underutil_cpu_sorted[region][cloudwatch_name]
+      instance_mem_metrics = ds_cloudwatch_underutil_mem_sorted[region][cloudwatch_name]
+      instance_netin_metrics = ds_cloudwatch_underutil_netin_sorted[region][cloudwatch_name]
+      instance_netout_metrics = ds_cloudwatch_underutil_netout_sorted[region][cloudwatch_name]
+
+      // Create object we're going to return
+      merged_instance = {
+        instanceId: instance['instanceId'],
+        instanceArn: instance['instanceArn'],
+        resourceType: instance['resourceType'],
+        name: instance['name'],
+        status: instance['status'],
+        databaseEngine: instance['databaseEngine'],
+        engineVersion: instance['engineVersion'],
+        privateDnsName: instance['privateDnsName'],
+        region: instance['region'],
+        tags: instance['tags'],
+        availabilityZone: instance['availabilityZone'],
+        licenseModel: instance['licenseModel'],
+        processorFeatures: instance['processorFeatures'],
+        vcpus: instance['vcpus']
+      }
 
-          if (typeof(ds_instance_costs_grouped[cost_name]) == 'number') {
-            cost = ds_instance_costs_grouped[cost_name]
-          }
+      // Grab usage data for the instance if it is present.
+      // Note: We don't simply name them the same as Cloudwatch does because
+      // prior versions of this policy also didn't, and we want to ensure
+      // that exported incident data looks the same as it used to.
+      cpu_stats_list = [ "Average", "Minimum", "Maximum", "p99", "p95", "p90" ]
 
-          cost_per_nfu = cost / ds_aws_instance_size_map[resourceType]['nfu']
+      _.each(cpu_stats_list, function(stat) {
+        incident_statname = "cpu" + "_" + stat.toLowerCase()
 
-          new_cost = cost_per_nfu * ds_aws_instance_size_map[newResourceType]['nfu']
-          savings = cost - new_cost
-        }
+        merged_instance[incident_statname] = null
 
-        // Create object we're going to return
-        merged_instance = {
-          instanceId: instance['instanceId'],
-          instanceArn: instance['instanceArn'],
-          resourceType: instance['resourceType'],
-          name: instance['name'],
-          status: instance['status'],
-          databaseEngine: instance['databaseEngine'],
-          engineVersion: instance['engineVersion'],
-          privateDnsName: instance['privateDnsName'],
-          region: instance['region'],
-          tags: instance['tags'],
-          availabilityZone: instance['availabilityZone'],
-          licenseModel: instance['licenseModel'],
-          processorFeatures: instance['processorFeatures'],
-          vcpus: instance['vcpus'],
-          savings: savings,
-          newResourceType: newResourceType
+        if (typeof(instance_cpu_metrics[stat]) == 'number') {
+          merged_instance[incident_statname] = Math.round(instance_cpu_metrics[stat] * 100) / 100
         }
+      })
 
-        // Grab usage data for the instance if it is present.
-        // Note: We don't simply name them the same as Cloudwatch does because
-        // prior versions of this policy also didn't, and we want to ensure
-        // that exported incident data looks the same as it used to.
-        cpu_stats_list = [ "Average", "Minimum", "Maximum", "p99", "p95", "p90" ]
-
-        _.each(cpu_stats_list, function(stat) {
-          incident_statname = "cpu" + "_" + stat.toLowerCase()
-
-          merged_instance[incident_statname] = null
-
-          if (typeof(instance_cpu_metrics[stat]) == 'number') {
-            merged_instance[incident_statname] = Math.round(instance_cpu_metrics[stat] * 100) / 100
-          }
-        })
-
-        mem_stats_list = [ "Average", "Minimum", "Maximum" ]
+      mem_stats_list = [ "Average", "Minimum", "Maximum" ]
 
-        _.each(mem_stats_list, function(stat) {
-          incident_statname = "mem" + "_" + stat.toLowerCase()
+      _.each(mem_stats_list, function(stat) {
+        incident_statname = "mem" + "_" + stat.toLowerCase()
 
-          merged_instance[incident_statname] = null
+        merged_instance[incident_statname] = null
 
-          if (typeof(instance_mem_metrics[stat]) == 'number') {
-            merged_instance[incident_statname] = Math.round(instance_mem_metrics[stat] / 1024 / 1024 * 100) / 100
-          }
-        })
+        if (typeof(instance_mem_metrics[stat]) == 'number') {
+          merged_instance[incident_statname] = Math.round(instance_mem_metrics[stat] / 1024 / 1024 * 100) / 100
+        }
+      })
 
-        netin_stats_list = [ "Average", "Minimum", "Maximum" ]
+      netin_stats_list = [ "Average", "Minimum", "Maximum" ]
 
-        _.each(netin_stats_list, function(stat) {
-          incident_statname = "netin" + "_" + stat.toLowerCase()
+      _.each(netin_stats_list, function(stat) {
+        incident_statname = "netin" + "_" + stat.toLowerCase()
 
-          merged_instance[incident_statname] = null
+        merged_instance[incident_statname] = null
 
-          if (typeof(instance_netin_metrics[stat]) == 'number') {
-            merged_instance[incident_statname] = Math.round(instance_netin_metrics[stat] * 100) / 100
-          }
-        })
+        if (typeof(instance_netin_metrics[stat]) == 'number') {
+          merged_instance[incident_statname] = Math.round(instance_netin_metrics[stat] * 100) / 100
+        }
+      })
 
-        netout_stats_list = [ "Average", "Minimum", "Maximum" ]
+      netout_stats_list = [ "Average", "Minimum", "Maximum" ]
 
-        _.each(netout_stats_list, function(stat) {
-          incident_statname = "netout" + "_" + stat.toLowerCase()
+      _.each(netout_stats_list, function(stat) {
+        incident_statname = "netout" + "_" + stat.toLowerCase()
 
-          merged_instance[incident_statname] = null
+        merged_instance[incident_statname] = null
 
-          if (typeof(instance_netout_metrics[stat]) == 'number') {
-            merged_instance[incident_statname] = Math.round(instance_netout_metrics[stat] * 100) / 100
-          }
-        })
+        if (typeof(instance_netout_metrics[stat]) == 'number') {
+          merged_instance[incident_statname] = Math.round(instance_netout_metrics[stat] * 100) / 100
+        }
+      })
 
-        // Send the instance information with the CloudWatch data into the final result.
-        // Also adds in the account ID and currency symbol since itll be needed for the incident.
-        result.push(merged_instance)
-      }
+      // Send the instance information with the CloudWatch data into the final result.
+      // Also adds in the account ID and currency symbol since itll be needed for the incident.
+      result.push(merged_instance)
     }
   })
 EOS
 end
 
 datasource "ds_rds_underutil_instances" do
-  run_script $js_rds_underutil_instances, $ds_rds_nonidle_instances_with_metrics, $param_stats_threshold, $param_stats_underutil_threshold_cpu_value
+  run_script $js_rds_underutil_instances, $ds_rds_nonidle_instances_with_metrics, $ds_aws_instance_size_map, $ds_instance_costs_grouped, $param_stats_threshold, $param_stats_underutil_threshold_cpu_value, $param_downsize_multiple
 end
 
 script "js_rds_underutil_instances", type: "javascript" do
-  parameters "ds_rds_nonidle_instances_with_metrics", "param_stats_threshold", "param_stats_underutil_threshold_cpu_value"
+  parameters "ds_rds_nonidle_instances_with_metrics", "ds_aws_instance_size_map", "ds_instance_costs_grouped", "param_stats_threshold", "param_stats_underutil_threshold_cpu_value", "param_downsize_multiple"
   result "result"
   code <<-'EOS'
-  // Filter above list to just underutilized instances
-  result = _.filter(ds_rds_nonidle_instances_with_metrics, function(instance) {
+  result = []
+
+  _.each(ds_rds_nonidle_instances_with_metrics, function(instance) {
     cpu_value = instance['cpu_' + param_stats_threshold.toLowerCase()]
-    cpu_undertilized = cpu_value < param_stats_underutil_threshold_cpu_value || cpu_value == null
-    return cpu_undertilized && typeof(instance['newResourceType']) == 'string'
+    if (typeof(cpu_value) != 'number') { cpu_value = 0 }
+
+    if (cpu_value < param_stats_underutil_threshold_cpu_value && ds_aws_instance_size_map[instance["resourceType"]]["down"]) {
+      newResourceType = ds_aws_instance_size_map[instance["resourceType"]]["down"]
+
+      if (param_downsize_multiple == "Yes") {
+        while (ds_aws_instance_size_map[newResourceType]["down"] && cpu_value * 2 < param_stats_underutil_threshold_cpu_value) {
+          cpu_value = cpu_value * 2
+          newResourceType = ds_aws_instance_size_map[newResourceType]['down']
+        }
+      }
+
+      cost_name = "db:" + instance['name'].toLowerCase()
+      savings = 0.0
+
+      cost = 0.0
+      if (typeof(ds_instance_costs_grouped[cost_name]) == 'number') { cost = ds_instance_costs_grouped[cost_name] }
+
+      cost_per_nfu = cost / ds_aws_instance_size_map[instance["resourceType"]]['nfu']
+
+      new_cost = cost_per_nfu * ds_aws_instance_size_map[newResourceType]['nfu']
+      savings = cost - new_cost
+
+      new_instance = { newResourceType: newResourceType, savings: savings }
+      _.each(_.keys(instance), function(key) { new_instance[key] = instance[key] })
+      result.push(new_instance)
+    }
   })
 EOS
 end
@@ -1474,7 +1482,7 @@ script "js_rds_idle_incident", type: "javascript" do
         licenseModel: instance['licenseModel'],
         processorFeatures: instance['processorFeatures'],
         vcpus: instance['vcpus'],
-        savings: parseFloat(savings.toFixed(3)),
+        savings: Math.round(savings * 1000) / 1000,
         savingsCurrency: ds_currency['symbol'],
         lookbackPeriod: param_stats_lookback,
         newResourceType: "Terminate RDS Instance",
@@ -1515,7 +1523,7 @@ script "js_rds_idle_incident", type: "javascript" do
 
   savings_message = [
     ds_currency['symbol'], ' ',
-    formatNumber(parseFloat(total_savings).toFixed(2), ds_currency['separator'])
+    formatNumber(Math.round(total_savings * 100) / 100, ds_currency['separator'])
   ].join('')
 
   // Sort by descending order of savings value
@@ -1615,7 +1623,7 @@ script "js_rds_underutil_incident", type: "javascript" do
         licenseModel: instance['licenseModel'],
         processorFeatures: instance['processorFeatures'],
         vcpus: instance['vcpus'],
-        savings: parseFloat(savings.toFixed(3)),
+        savings: Math.round(savings * 1000) / 1000,
         savingsCurrency: ds_currency['symbol'],
         lookbackPeriod: param_stats_lookback,
         service: "AmazonRDS",
@@ -1661,7 +1669,7 @@ script "js_rds_underutil_incident", type: "javascript" do
 
   savings_message = [
     ds_currency['symbol'], ' ',
-    formatNumber(parseFloat(total_savings).toFixed(2), ds_currency['separator'])
+    formatNumber(Math.round(total_savings * 100) / 100, ds_currency['separator'])
   ].join('')
 
   // Sort by descending order of savings value

cost/aws/rightsize_rds_instances/aws_rightsize_rds_instances_meta_parent.pt

@@ -7,7 +7,7 @@ category "Meta"
 default_frequency "15 minutes"
 info(
   provider: "AWS",
-  version: "5.4.2", # This version of the Meta Parent Policy Template should match the version of the Child Policy Template as it appears in the Catalog for best reliability
+  version: "5.5.0", # This version of the Meta Parent Policy Template should match the version of the Child Policy Template as it appears in the Catalog for best reliability
   publish: "true",
   deprecated: "false"
 )
@@ -77,6 +77,15 @@ parameter "param_min_savings" do
   default 0
 end
 
+parameter "param_downsize_multiple" do
+  type "string"
+  category "Policy Settings"
+  label "Skip Instance Sizes"
+  description "Whether to recommend downsizing multiple sizes. When set to 'No', only the next smaller size will ever be recommended for downsizing. When set to 'Yes', more aggressive downsizing recommendations will be made when appropriate."
+  allowed_values "Yes", "No"
+  default "No"
+end
+
 parameter "param_regions_allow_or_deny" do
   type "string"
   category "Filters"

data/policy_permissions_list/master_policy_permissions_list.json

@@ -2347,7 +2347,7 @@
     {
       "id": "./cost/aws/rightsize_rds_instances/aws_rightsize_rds_instances.pt",
       "name": "AWS Rightsize RDS Instances",
-      "version": "5.4.2",
+      "version": "5.5.0",
       "providers": [
         {
           "name": "aws",

data/policy_permissions_list/master_policy_permissions_list.yaml

@@ -1346,7 +1346,7 @@
       required: true
 - id: "./cost/aws/rightsize_rds_instances/aws_rightsize_rds_instances.pt"
   name: AWS Rightsize RDS Instances
-  version: 5.4.2
+  version: 5.5.0
   :providers:
   - :name: aws
     :permissions: