isLinux() is false for ec2 instances added automatically | Archive

Sam_Gendler · 2018-04-26T21:42:53Z

I recently enabled collector-based monitoring for resources discovered via my AWS Cloud Account. My intention was to enable snmp based monitoring of instances, since cloudwatch doesn't give visibility into a lot of metrics that are otherwise useful - disk utilization, most notably. However, while the ec2 instances did pick up basic collector monitoring - ping, Host Status, etc - none of the extended data sources that are automatically applied if I add the instance to the UI manually were enabled. Looking at data source definitions, many snmp data sources use functions like Servers() and isLinux() in their applies_to expressions, in addition to looking for various snmp-based strings in system.categories. The definition of Servers() is visible in the user appliesTo functions, and it can be easily modified to include 'system.cloud.category == "AWS/ECS"' as one of the clauses. However, the definition of isLinux() isn't visible and it doesn't appear that the linux-ness of the ec2 instance is visible via the standard properties, even though manually adding the instance via the logicmonitor UI would cause it to be correctly identified as both an SNMP-enabled resource and as a resource running linux. Instead, I had to build groups based on system.cloud.category and other variables in order to apply the following values to system.categories: snmpTCPUDP,Netsnmp,snmpHR,snmpUptime,snmp. The only categories it picked up, by default, were AWS/EC2 and collectorDataSources. To some extent, it feels like a bug that an instance added via the UI gets treated differently than an instance added automatically via cloud account detection - it seems that there is no value for system.sysinfo when the instance is automatically added via cloud account detection. But in the absence of a fix for that bug, is there some other way to make isLinux() return true for a linux-based EC2 instance? What about other built-in functions that don't seem to have modifiable, or even visible, definitions?

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isLinux() is false for ec2 instances added automatically | Archive | LogicMonitor Community