Cloudwatch Service Log Parsing Error

The error you're encountering with the @serviceLogParsingError field is likely not due to invalid JSON syntax, but rather related to how CloudWatch Logs is attempting to parse the log entry.

CloudWatch Logs has certain expectations for log formats, and in this case, it seems to be having trouble parsing the JSON structure within your log line. This could be due to a few reasons:

1. Unexpected field types: The "num items" field has a space in its name, which might be causing issues for the parser.

2. Mixed data types: Your JSON contains both string and numeric values, which might be confusing the parser if it's expecting a specific type for certain fields.

3. Nested JSON: The entire JSON object is embedded as a string within another log structure, which could be complicating the parsing process.

To resolve this issue, you might want to consider the following approaches:

1. Ensure consistent field naming: Use underscores instead of spaces in field names (e.g., "num_items" instead of "num items").

2. Review your log format: Make sure it aligns with CloudWatch Logs' expected format for your specific use case.

3. Use a custom log parser: If your log format is complex or non-standard, you might need to configure a custom parser in CloudWatch Logs to correctly interpret your log data.

4. Preprocess logs: Consider preprocessing your logs before sending them to CloudWatch to ensure they're in a format that's easier for CloudWatch to parse.

If the issue persists after trying these approaches, you may need to contact AWS support for further assistance, as there might be specific requirements or limitations in the CloudWatch Logs parsing system that are causing this error.
Sources
Resolve throttling errors in CloudWatch logs | AWS re:Post
Use the unified CloudWatch agent to troubleshoot timestamp issues | AWS re:Post