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Caution

Grafana Alloy is the new name for our distribution of the OTel collector. Grafana Agent has been deprecated and is in Long-Term Support (LTS) through October 31, 2025. Grafana Agent will reach an End-of-Life (EOL) on November 1, 2025. Read more about why we recommend migrating to Grafana Alloy.

Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

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Open source

loki.source.windowsevent

loki.source.windowsevent reads events from Windows Event Logs and forwards them to other loki.* components.

Multiple loki.source.windowsevent components can be specified by giving them different labels.

Usage

river 
loki.source.windowsevent "LABEL" {
  eventlog_name = EVENTLOG_NAME
  forward_to    = RECEIVER_LIST
}

Arguments

The component starts a new reader and fans out log entries to the list of receivers passed in forward_to.

loki.source.windowsevent supports the following arguments:

NameTypeDescriptionDefaultRequired
localenumberLocale ID for event rendering. 0 default is Windows Locale.0no
eventlog_namestringEvent log to read from.See below.
xpath_querystringEvent log to read from."*"See below.
bookmark_pathstringKeeps position in event log."DATA_PATH/bookmark.xml"no
poll_intervaldurationHow often to poll the event log."3s"no
exclude_event_databoolExclude event data.falseno
exclude_user_databoolExclude user data.falseno
use_incoming_timestampboolWhen false, assigns the current timestamp to the log when it was processed.falseno
forward_tolist(LogsReceiver)List of receivers to send log entries to.yes
labelsmap(string)The labels to associate with incoming logs.no

NOTE: eventlog_name is required if xpath_query does not specify the event log. You can define xpath_query in short or xml form. When using the XML form you can specify event_log in the xpath_query. If using short form, you must define eventlog_name.

Component health

loki.source.windowsevent is only reported as unhealthy if given an invalid configuration.

Example

This example collects log entries from the Event Log specified in eventlog_name and forwards them to a loki.write component so they are written to Loki.

river 
loki.source.windowsevent "application"  {
    eventlog_name = "Application"
    forward_to = [loki.write.endpoint.receiver]
}

loki.write "endpoint" {
    endpoint {
        url ="loki:3100/api/v1/push"
    }
}