[{"data":1,"prerenderedAt":566},["ShallowReactive",2],{"content-svc-lambda-guides-aws-lambda-operator-guide-parse-logs":3},{"markdown":4,"frontMatterAttributes":5,"bodyRaw":8,"menu":9,"menuType":563,"isCollapseableMenu":12,"nextDocItem":438,"previousDocItem":428,"contributorPaths":564,"contentName":565,"slug":437,"readingTime":33},"\u003Cp>Many developers use unstructured logging in their Lambda functions by using commands such as \u003Ca href=\"https:\u002F\u002Fwww.w3schools.com\u002Fpython\u002Fref_func_print.asp\">Python’s print\u003C\u002Fa> function. This creates human-readable output that can be difficult to interpret and analyze programmatically. Values may appear in these logs arbitrarily, and the format may change over time.\u003C\u002Fp>\n\u003Cp>In the \u003Cem>logsInsightsUnstructured\u003C\u002Fem> example, this function generates an unstructured log line with an embedded value. Over multiple invocations, this appears as follows in CloudWatch Logs:\u003C\u002Fp>\n\u003Cp>\u003Cimg src=\"\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-8.png\" alt=\"\">\u003C\u002Fp>\n\u003Cp>You can use the parse command in CloudWatch Logs Insights to extract data from a log field for further processing, by using either a glob or regular expression. In the example, the following query extracted the \u003Cem>UploadedBytes\u003C\u002Fem> value and then uses this to create minimum, maximum and average statistics:\u003C\u002Fp>\n\u003Cp>\u003Cimg src=\"\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-9.png\" alt=\"\">\u003C\u002Fp>\n\u003Cp>While this approach is useful for handling logs from existing systems that may be difficult to change, it can be time-consuming and awkward to build custom parsing filters for each type of unstructured log file. To apply monitoring to production systems, it’s generally easier to implement structured logging throughout your applications. You can achieve this in Python with libraries like \u003Ca href=\"https:\u002F\u002Fwww.structlog.org\u002Fen\u002Fstable\u002F\">structlog\u003C\u002Fa>, and most other runtimes have similar structured logging libraries or tools available. You can also use AWS client libraries to \u003Ca href=\"https:\u002F\u002Fdocs.aws.amazon.com\u002FAmazonCloudWatch\u002Flatest\u002Fmonitoring\u002FCloudWatch_Embedded_Metric_Format_Libraries.html\">generate embedded metric format logs\u003C\u002Fa>.\u003C\u002Fp>\n\u003Cp>Using log levels is an important first step in generating filter-friendly logs files that separate informational messages from warnings or errors. The \u003Cem>logsInsightsLogLevels\u003C\u002Fem> example shows the effect of providing log levels in Node.js with this code:\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-json\">exports.handler = async (event) => {\n    console.log("console.log - Application is fine")\n    console.info("console.info - This is the same as console.log")\n    console.warn("console.warn - Application provides a warning")\n    console.error("console.error - An error occurred")\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>The CloudWatch log file contains a separate field specifying the log level:\u003C\u002Fp>\n\u003Cp>\u003Cimg src=\"\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-10.png\" alt=\"\">\u003C\u002Fp>\n\u003Cp>A CloudWatch Logs Insights query can then filter on log level, making it simpler to generate queries based only on errors, for example:\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-sql\">fields @timestamp, @message\n| filter @message like \u002FERROR\u002F\n| sort @timestamp desc\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>JSON is commonly used to provide structure for application logs. In the \u003Cem>logsInsightsJSON\u003C\u002Fem> example, the logs have been converted to JSON to output three distinct values. The output now looks like:\u003C\u002Fp>\n\u003Cp>\u003Cimg src=\"\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-11.png\" alt=\"\">\u003C\u002Fp>\n\u003Cp>The CloudWatch Logs Insights feature automatically discovers values in JSON output and parses the messages as fields, without the need for custom glob or regular expression. By using the JSON-structured logs, the following query finds invocations where the uploaded file was larger than 1 MB, the upload time was more than 1 second, and the invocation was not a cold start:\u003C\u002Fp>\n\u003Cp>\u003Cimg src=\"\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-12.png\" alt=\"\">\u003C\u002Fp>\n\u003Cp>The discovered fields in JSON are automatically populated on the \u003Cem>Fields\u003C\u002Fem> drawer on the right side. Standard fields emitted by the Lambda service are prefixed with '@' and you can query on these fields in the same way. Lambda logs always include the fields @timestamp, @logStream, @message, @requestId, @duration, @billedDuration, @type, @maxMemoryUsed, @memorySize. If X-Ray is enabled for a function, logs also include @xrayTraceId and @xraySegmentId.\u003C\u002Fp>\n",{"title":6,"order":7},"Parsing logs and structured logging",69,"Many developers use unstructured logging in their Lambda functions by using commands such as [Python’s print](https:\u002F\u002Fwww.w3schools.com\u002Fpython\u002Fref_func_print.asp) function. This creates human-readable output that can be difficult to interpret and analyze programmatically. Values may appear in these logs arbitrarily, and the format may change over time.\n\nIn the _logsInsightsUnstructured_ example, this function generates an unstructured log line with an embedded value. Over multiple invocations, this appears as follows in CloudWatch Logs:\n\n![](\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-8.png)\n\nYou can use the parse command in CloudWatch Logs Insights to extract data from a log field for further processing, by using either a glob or regular expression. In the example, the following query extracted the _UploadedBytes_ value and then uses this to create minimum, maximum and average statistics:\n\n![](\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-9.png)\n\nWhile this approach is useful for handling logs from existing systems that may be difficult to change, it can be time-consuming and awkward to build custom parsing filters for each type of unstructured log file. To apply monitoring to production systems, it’s generally easier to implement structured logging throughout your applications. You can achieve this in Python with libraries like [structlog](https:\u002F\u002Fwww.structlog.org\u002Fen\u002Fstable\u002F), and most other runtimes have similar structured logging libraries or tools available. You can also use AWS client libraries to [generate embedded metric format logs](https:\u002F\u002Fdocs.aws.amazon.com\u002FAmazonCloudWatch\u002Flatest\u002Fmonitoring\u002FCloudWatch_Embedded_Metric_Format_Libraries.html).\n\nUsing log levels is an important first step in generating filter-friendly logs files that separate informational messages from warnings or errors. The _logsInsightsLogLevels_ example shows the effect of providing log levels in Node.js with this code:\n\n```json\nexports.handler = async (event) => {\n    console.log(\"console.log - Application is fine\")\n    console.info(\"console.info - This is the same as console.log\")\n    console.warn(\"console.warn - Application provides a warning\")\n    console.error(\"console.error - An error occurred\")\n}\n```\n\nThe CloudWatch log file contains a separate field specifying the log level:\n\n![](\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-10.png)\n\nA CloudWatch Logs Insights query can then filter on log level, making it simpler to generate queries based only on errors, for example:\n\n```sql\nfields @timestamp, @message\n| filter @message like \u002FERROR\u002F\n| sort @timestamp desc\n```\n\nJSON is commonly used to provide structure for application logs. In the _logsInsightsJSON_ example, the logs have been converted to JSON to output three distinct values. The output now looks like:\n\n![](\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-11.png)\n\nThe CloudWatch Logs Insights feature automatically discovers values in JSON output and parses the messages as fields, without the need for custom glob or regular expression. By using the JSON-structured logs, the following query finds invocations where the uploaded file was larger than 1 MB, the upload time was more than 1 second, and the invocation was not a cold start:\n\n![](\u002Fassets\u002Fexternal\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fassets\u002Fimages\u002Fmonitoring-observability-figure-12.png)\n\nThe discovered fields in JSON are automatically populated on the _Fields_ drawer on the right side. Standard fields emitted by the Lambda service are prefixed with '@' and you can query on these fields in the same way. Lambda logs always include the fields @timestamp, @logStream, @message, @requestId, @duration, @billedDuration, @type, @maxMemoryUsed, @memorySize. If X-Ray is enabled for a function, logs also include @xrayTraceId and @xraySegmentId.",[10,21,139,247,314,384,486,555],{"title":-1,"collapsible":11,"isCollapsed":12,"content":13},false,true,[14],{"title":15,"order":16,"time":17,"path":18,"id":19,"link":20},"Introduction",1,"4 min","intro","intro.md","\u002Fcontent\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fintro",{"title":22,"collapsible":12,"isCollapsed":12,"content":23},"Event-driven architectures",[24,30,37,43,49,55,62,68,74,80,86,92,98,104,110,116,122,128,133],{"title":22,"order":25,"time":26,"path":27,"id":28,"link":29},2,"1 min","event-driven-architectures","event-driven-architectures.md","\u002Fcontent\u002Fservice\u002Flambda\u002Fguides\u002Faws-lambda-operator-guide\u002Fevent-driven-architectures",{"title":31,"order":32,"time":33,"path":34,"id":35,"link":36},"How Lambda fits into the event-driven paradigm",3,"3 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