Cloudwatch: Add AWS DocDB metrics (#17241)

Closes #16535

pkg/tsdb/cloudwatch/metric_find_query.go

@@ -56,6 +56,7 @@ func init() {
 		"AWS/Connect":           {"CallBackNotDialableNumber", "CallRecordingUploadError", "CallsBreachingConcurrencyQuota", "CallsPerInterval", "ConcurrentCalls", "ConcurrentCallsPercentage", "ContactFlowErrors", "ContactFlowFatalErrors", "LongestQueueWaitTime", "MisconfiguredPhoneNumbers", "MissedCalls", "PublicSigningKeyUsage", "QueueCapacityExceededError", "QueueSize", "ThrottledCalls", "ToInstancePacketLossRate"},
 		"AWS/DDoSProtection":    {"AllowedRequests", "BlockedRequests", "CountedRequests", "DDoSAttackBitsPerSecond", "DDoSAttackPacketsPerSecond", "DDoSAttackRequestsPerSecond", "DDoSDetected", "PassedRequests"},
 		"AWS/DMS":               {"CDCChangesDiskSource", "CDCChangesDiskTarget", "CDCChangesMemorySource", "CDCChangesMemoryTarget", "CDCIncomingChanges", "CDCLatencySource", "CDCLatencyTarget", "CDCThroughputBandwidthSource", "CDCThroughputBandwidthTarget", "CDCThroughputRowsSource", "CDCThroughputRowsTarget", "CPUUtilization", "FreeStorageSpace", "FreeableMemory", "FullLoadThroughputBandwidthSource", "FullLoadThroughputBandwidthTarget", "FullLoadThroughputRowsSource", "FullLoadThroughputRowsTarget", "NetworkReceiveThroughput", "NetworkTransmitThroughput", "ReadIOPS", "ReadLatency", "ReadThroughput", "SwapUsage", "WriteIOPS", "WriteLatency", "WriteThroughput"},
+		"AWS/DocDB":             {"BackupRetentionPeriodStorageUsed", "BufferCacheHitRatio", "CPUUtilization", "DatabaseConnections", "DBInstanceReplicaLag", "DBClusterReplicaLagMaximum", "DBClusterReplicaLagMinimum", "DiskQueueDepth", "EngineUptime", "FreeableMemory", "FreeLocalStorage", "NetworkReceiveThroughput", "NetworkThroughput", "NetworkTransmitThroughput", "ReadIOPS", "ReadLatency", "ReadThroughput", "SnapshotStorageUsed", "SwapUsage", "TotalBackupStorageBilled", "VolumeBytesUsed", "VolumeReadIOPs", "VolumeWriteIOPs", "WriteIOPS", "WriteLatency", "WriteThroughput"},
 		"AWS/DX":                {"ConnectionBpsEgress", "ConnectionBpsIngress", "ConnectionCRCErrorCount", "ConnectionLightLevelRx", "ConnectionLightLevelTx", "ConnectionPpsEgress", "ConnectionPpsIngress", "ConnectionState"},
 		"AWS/DynamoDB":          {"ConditionalCheckFailedRequests", "ConsumedReadCapacityUnits", "ConsumedWriteCapacityUnits", "OnlineIndexConsumedWriteCapacity", "OnlineIndexPercentageProgress", "OnlineIndexThrottleEvents", "PendingReplicationCount", "ProvisionedReadCapacityUnits", "ProvisionedWriteCapacityUnits", "ReadThrottleEvents", "ReplicationLatency", "ReturnedBytes", "ReturnedItemCount", "ReturnedRecordsCount", "SuccessfulRequestLatency", "SystemErrors", "ThrottledRequests", "TimeToLiveDeletedItemCount", "UserErrors", "WriteThrottleEvents"},
 		"AWS/EBS":               {"BurstBalance", "VolumeConsumedReadWriteOps", "VolumeIdleTime", "VolumeQueueLength", "VolumeReadBytes", "VolumeReadOps", "VolumeThroughputPercentage", "VolumeTotalReadTime", "VolumeTotalWriteTime", "VolumeWriteBytes", "VolumeWriteOps"},
@@ -135,6 +136,7 @@ func init() {
 		"AWS/Connect":           {"InstanceId", "MetricGroup", "Participant", "QueueName", "Stream Type", "Type of Connection"},
 		"AWS/DDoSProtection":    {"Region", "Rule", "RuleGroup", "WebACL"},
 		"AWS/DMS":               {"ReplicationInstanceIdentifier", "ReplicationTaskIdentifier"},
+		"AWS/DocDB":             {"DBClusterIdentifier"},
 		"AWS/DX":                {"ConnectionId"},
 		"AWS/DynamoDB":          {"GlobalSecondaryIndexName", "Operation", "ReceivingRegion", "StreamLabel", "TableName"},
 		"AWS/EBS":               {"VolumeId"},