Monitoring log files is essential for administrators during emergencies. The log file monitor keeps track of errors in logs from applications on both Windows and Linux servers.
Here are the key benefits:

  • Monitor log data for any event or pattern
  • Identify errors for any failure
  • Improved security

A log file maintains a record and timestamp of events that occur in an application. The agent examines log files with a known search string (or pattern) based on the configured check type. If the agent detects a match, an alert is triggered in the alert browser. The system monitors log files including audit logs, transaction logs, and event logs. Different log file extensions can be used but .log is recommended for monitored logs.

Log management can be a complex task maintaining log file size, applying a file checksum, and making it easy for administrators to search through old log data files to find errors. Log rotation compresses old data (and large data) into a new log file. This process simplifies log management while allowing more space for new logs.


Log file monitor graphs have the following limitations:

  • Log files with .exe and .rar file extensions are not supported.
  • Regular expressions are not supported in folder names.
  • Up to 20 sections can be added.

G1 Log File Monitoring

By using log file monitors, administrators can rule out the chance of missing an error in logs.
G1 Log file monitors can be added using Setup > Monitoring > Templates > Other Monitors.

See the Logging section for information on how to create and maintain Linux and Windows log file monitors.

Log Monitor Alerts

Critical alerts are sent while monitoring log files. View the alerts in the Alert browser. Examine the inverse flag in the alert description to verify the check type.

The inverse flag displays 0 if the check type exists. The alert description displays 50 characters from the last occurrence of the search string in one iteration.

Check Type is Exist

The inverse flag displays 1 if the check type does not exist.

Check Type is Does Not Exist

A critical alert is sent for missing log files and sends an OK alert after the retrieval of the same file.

File Not Found

Log Monitor Graphs

The graphical data is displayed for each name configured in the log file monitor.

Navigate to Infrastructure > Resources > Device Details > Metrics to view the monitor graphs. Only one graph is displayed for all configured names in an individual log file monitor.

The log file monitor graph is different for Windows and Linux devices.

For Windows

In Windows devices, the graph is plotted as follows:

  • 1: The input string exists
  • 0 The input string does not exist
Windows Devices

For Linux

For Linux devices, graphs plot according to the search string count.
For example, if the search string appears 6 times in the log file, the log monitor graph displays 6 instances of it.

Linux Devices

G2 Log File Monitoring

The G2 logfile monitoring functionality is similar to the G1 logfile monitor with including advanced option for users to customize the subject and description according to their needs.

You can add the log file monitors by following these steps:

  1. Go to Resources and select the resource where you want to apply the template. Then, click on it.
  2. Go to Monitor > Template.
  3. Click on +Assign Templates option.
  4. Search for the template (Agent G2 - Logfile Monitor Template).
  5. Select the template and click Assign.
    Linux Devices
  6. Enter the configuration details in the field to apply template:
    • Name: Instance name of the logfile
    • Filename: Name of the logfile to be monitored
    • Rotatedfilename: Name of the rotated logfile
    • Expression: Expression need to be searched in the logfile
    • Checktype: Checktype should be Yes or No
      • Yes: sends the alert if expression exist
      • No: sends the alert if expression does not exists
    • Threshold: Sends the alert based on input threshold
  7. Click Submit.
Linux Devices

Log Monitor Graphs

Graphs plot according to the search string count.
For example, if the search string appears 6 times in the log file, the log monitor graph displays 6 instances of it.

Linux Devices

Log Monitor Alerts

Critical alerts are sent during the log file monitoring. You can view these alerts in the Alert browser.
Check the alert description for the inverse flag to confirm the check type.

Linux Devices

Alert subject and description can be customized in G2 log file monitor using available tokens.

Available tokens List

${logfile.status}Logfile monitor status
${logfile.searchcount}Count of occurrences of the expression
${logfile.expression}Expression of Logfile monitor
${logfile.checktype}Exist or not exists
${logfile.component}Instance of logfile monitor
${logfile.filename}Name of the logfile
${logfile.last.searchstring}Last line containing search string
${logfile.rotatedfile}Rotated logfile
${logfile.last.rotatedsearchstring}Last line of rotated file
${matchedstring.all}All matches
${matchedstring.ten}Ten matches
${matchedstring.five}Five matches