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Oct 21, 2019
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Add note about CloudWatch event compression #141

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10 changes: 5 additions & 5 deletions doc_source/services-cloudwatchlogs.md
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Expand Up @@ -2,9 +2,9 @@

You can use a Lambda function to monitor and analyze logs from an Amazon CloudWatch Logs log stream\. Create [subscriptions](https://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/Subscriptions.html) for one or more log streams to invoke a function when logs are created or match an optional pattern\. Use the function to send a notification or persist the log to a database or storage\.

CloudWatch Logs invokes your function asynchronously with an event that contains encoded log data\.
CloudWatch Logs invokes your function asynchronously with an event that contains Base64 encoded and Zip compressed log data\.

**Example Amazon CloudWatch Logs Message Event**
**Example Amazon CloudWatch Logs Message Event**

```
{
Expand All @@ -14,9 +14,9 @@ CloudWatch Logs invokes your function asynchronously with an event that contains
}
```

When decoded, the log data is a JSON document with the following structure\.
When decoded and decompressed, the log data is a JSON document with the following structure\.

**Example Amazon CloudWatch Logs Message Data \(decoded\)**
**Example Amazon CloudWatch Logs Message Data \(decoded\)**

```
{
Expand All @@ -37,4 +37,4 @@ When decoded, the log data is a JSON document with the following structure\.
}
```

For a sample application that uses CloudWatch Logs as a trigger, see [Error Processor Sample Application for AWS Lambda](sample-errorprocessor.md)\.
For a sample application that uses CloudWatch Logs as a trigger, see [Error Processor Sample Application for AWS Lambda](sample-errorprocessor.md)\.