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Increase MAX_EVENT_LEN to match current max #11159

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Increase MAX_EVENT_LEN to match current max #11159

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13 changes: 11 additions & 2 deletions plugins/out_cloudwatch_logs/cloudwatch_api.h
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Original file line number Diff line number Diff line change
Expand Up @@ -43,8 +43,17 @@
/* Maximum number of character limits including both the Attributes key and its value */
#define ATTRIBUTES_MAX_LEN 300

/* 256KiB minus 26 bytes for the event */
#define MAX_EVENT_LEN 262118
/*
* https://docs.aws.amazon.com/AmazonCloudWatchLogs/latest/APIReference/API_PutLogEvents.html
* AWS CloudWatch's documented maximum event size is 1,048,576 bytes (1 MiB),
* including JSON encoding overhead (structure, escaping, etc.).
*
* Setting MAX_EVENT_LEN to 1,000,000 bytes (1 MB) provides a ~4.6% safety margin
* to account for JSON encoding overhead and ensure reliable operation.
* Testing confirmed messages up to 1,048,546 bytes (encoding to 1,048,586 bytes)
* succeed, though we use a conservative limit for production safety.
*/
#define MAX_EVENT_LEN 1000000

/* Prefix used for entity fields only */
#define AWS_ENTITY_PREFIX "aws_entity"
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