Why does the RDS Metric Report show units different than AWS?

Products

• CloudHealth

Issue/Introduction

The Amazon RDS console might display metrics in units that are different from the units sent to Amazon CloudWatch.  For example, the Amazon RDS console might display a metric in megabytes (MB), while the metric is sent to Amazon CloudWatch in bytes.  See below for a breakdown of these metrics:

 

Metric	AWS Console name	Description	Units
BinLogDiskUsage	Binary Log Disk Usage (MB)	The amount of disk space occupied by binary logs on the primary. Applies to MySQL read replicas.	Bytes
CPUUtilization	CPU Utilization (Percent)	The percentage of CPU utilization.	Percent
DatabaseConnections	DB Connections (Count)	The number of database connections in use. The metric value might not include broken database connections that haven't been cleaned up by your database yet. So, the number of database connections recorded by your database might be higher than the metric value.	Count
DiskQueueDepth	Queue Depth (Count)	The number of outstanding I/Os (read/write requests) waiting to access the disk.	Count
FreeableMemory	Freeable Memory (MB)	The amount of available random access memory. For MariaDB, MySQL, Oracle, and PostgreSQL DB instances, this metric reports the value of the MemAvailable field of /proc/meminfo.	Bytes
FreeStorageSpace	Free Storage Space (MB/Second)	The amount of available storage space.	Bytes
NetworkReceiveThroughput	Network Receive Throughput (MB/Second)	The incoming (receive) network traffic on the DB instance, including both customer database traffic and Amazon RDS traffic used for monitoring and replication.	Bytes/Second
NetworkTransmitThroughput	Network Transmit Throughput (MB/Second)	The outgoing (transmit) network traffic on the DB instance, including both customer database traffic and Amazon RDS traffic used for monitoring and replication.	Bytes/Second
ReadIOPS	Read IOPS (Count/Second)	The average number of disk read I/O operations per second.	Count/Second
ReadLatency	Read Latency (Milliseconds)	The average amount of time taken per disk I/O operation.	Seconds
ReadThroughput	Read Throughput (MB/Second)	The average number of bytes read from disk per second.	Bytes/Second
ReplicaLag	Replica Lag (Milliseconds)	The amount of time a read replica DB instance lags behind the source DB instance. Applies to MySQL, MariaDB, Oracle, PostgreSQL, and SQL Server read replicas.	Seconds
SwapUsage	Swap Usage (MB)	The amount of swap space used on the DB instance. This metric is not available for SQL Server.	Bytes
WriteIOPS	Write IOPS (Count/Second)	The average number of disk write I/O operations per second.	Count/Second
WriteLatency	Write Latency (Milliseconds)	The average amount of time taken per disk I/O operation.	Seconds
WriteThroughput	Write Throughput (MB/Second)	The average number of bytes written to disk per second.	Bytes/Second