Hello, I'm currently working on a Splunk query designed to identify and correlate specific error events leading up to system reboots or similar critical events within our logs. My goal is to track sequences where any of several error signatures occurs shortly before a system reboot or a related event, such as a kernel panic or cold restart. These error signatures include "EDAC UE errors," "Uncorrected errors," and "Uncorrected (Non-Fatal) errors," among others. Here's the SPL query I've been refining:     index IN (xxxx) sourcetype IN ("xxxx") ("EDAC* UE*" OR "* Uncorrected error *" OR "* Uncorrected (Non-Fatal) error *" OR "reboot" OR "*Kernel panic* UE *" OR "* UE ColdRestart*") | append [| eval search=if("true" ="true", "index IN (xxx) sourcetype IN (xxxxxx) shelf IN (*) card IN (*)", "*")] | transaction source keeporphans=true keepevicted=true startswith="*EDAC* UE*" OR "* Uncorrected error *" OR "* Uncorrected (Non-Fatal) error *" endswith="reboot" OR "*Kernel panic* UE *" OR "* UE ColdRestart*" maxspan=300s | search closed_txn = 1 | sort 0_time | search message!="*reboot*" | table tj_timestamp, system, ne, message   My primary question revolves around the use of the `transaction` command, specifically the `startswith` and `endswith` parameters. I aim to use multiple conditions (error signatures) to start a transaction and multiple conditions (types of reboots) to end a transaction. Does the `transaction` command support using logical operators such as OR and AND within `startswith` and `endswith` parameters to achieve this? If not, could you advise on how best to structure my query to accommodate these multiple conditions for initiating and concluding transactions? I'm looking to ensure that my query can capture any of the specified start conditions leading to any of the specified end conditions within a reasonable time frame (maxspan=300s), but I've encountered difficulties getting the expected results. Your expertise on the best practices for structuring such queries or any insights on what I might be doing wrong would be greatly appreciated. Thank you for your time and assistance. ... View more

I am working with event data in Splunk where each event contains a command with multiple arguments. I'm extracting these arguments and their associated values using regex, resulting in multi-value fields within Splunk. However, I'm encountering a challenge where some arguments do not have an associated value, and for these cases, I would like to set their values to `true`. Here's the SPL I'm using for extraction: | rex max_match=0 field=Aptlauncher_cmd "\s(?<flag>--?[\w\-.@|$|#]+)(?:(?=\s--?)|(?=\s[\w\-.\/|$|#|\"|=])\s(?<value>[^\s]+))?" What I need is to refine this SPL so that after extraction, any argument without a value is automatically assigned a value of `true`. After setting the default values, I would then like to use `mvexpand` to separate each argument-value pair into its own event. Could you provide guidance on how to adjust my regex or SPL command to accomplish this within Splunk? ... View more