# Translations with OpenTelemetry 1.0.0 format in CloudWatch


CloudWatch performs some transformations to put CloudWatch data into OpenTelemetry format.

**Translating namespace, metric name, and dimensions**

These attributes are key-value pairs encoded in the mapping.
+ One attribute has the key `Namespace` and its value is the namespace of the metric
+ One attribute has the key `MetricName` and its value is the name of the metric
+ One pair has the key `Dimensions` and its value is a nested list of key-value pairs. Each pair in this list maps to a CloudWatch metric dimension, where the pair's key is the name of the dimension and its value is the value of the dimension.

**Translating Average, Sum, SampleCount, Min and Max**

The Summary datapoint enables CloudWatch to export all of these statistics using one datapoint.
+ `startTimeUnixNano` contains the CloudWatch `startTime`
+ `timeUnixNano` contains the CloudWatch `endTime`
+ `sum` contains the Sum statistic.
+ `count` contains the SampleCount statistic.
+ `quantile_values` contains two `valueAtQuantile.value` objects:
  + `valueAtQuantile.quantile = 0.0` with `valueAtQuantile.value = Min value`
  + `valueAtQuantile.quantile = 0.99` with `valueAtQuantile.value = p99 value`
  + `valueAtQuantile.quantile = 0.999` with `valueAtQuantile.value = p99.9 value`
  + `valueAtQuantile.quantile = 1.0` with `valueAtQuantile.value = Max value`

Resources that consume the metric stream can calculate the Average statistic as **Sum/SampleCount**.

**Translating units**

CloudWatch units are mapped to the case-sensitive variant of the Unified code for Units of Measure, as shown in the following table. For more information, see [The Unified Code For Units of Measure](https://ucum.org/ucum.html).


| CloudWatch | OpenTelemetry | 
| --- | --- | 
|  Second |  s | 
|  Second or Seconds |  s | 
|  Microseconds |  us | 
|  Milliseconds |  ms | 
|  Bytes |  By | 
|  Kilobytes |  kBy | 
|  Megabytes |  MBy | 
|  Gigabytes |  GBy | 
|  Terabytes |  TBy | 
|  Bits |  bit | 
|  Kilobits |  kbit | 
|  Megabits |  MBit | 
|  Gigabits |  GBit | 
|  Terabits |  Tbit | 
|  Percent |  % | 
|  Count |  \$1Count\$1 | 
|  None |  1 | 

Units that are combined with a slash are mapped by applying the OpenTelemetry conversion of both the units. For example, Bytes/Second is mapped to By/s.