Documentation Index
Fetch the complete documentation index at: https://launchdarkly-preview.mintlify.app/llms.txt
Use this file to discover all available pages before exploring further.
Overview
This topic explains how to use LaunchDarkly’s observability features to view session logs. The Logs page displays a list of logs for your application. You can use the page to view the logs for a specific time range. Logs have different levels:Debug, Info, Warn, and Error.
Get started
To instrument your application to capture logs, read the documentation on Observability SDKs. The functionality is available through plugins to the LaunchDarkly JavaScript SDK. To view logs for your application, expand Observe, click Logs, then select a log from the list.Search
To learn more about the search specification for the logs view, read Search specification.Search attributes
By default, the observability SDK plugin automatically injects the following attributes to provide additional help with searching for logs: | Category | Attribute | Description| Example |
|---|
feature_flag
| Specifies whether the session is associated with a feature flag. You can refine results with the following additional attributes: context.id , contextKeys , key , provider.name , result.reason.inExperiment , result.reason.kind , result.value , and set.id .
| true |
| Log properties
| code.filepath
| File path emitting the log.
| /build/backend/worker/worker.go |
| code.function
| Function emitting the log.
| github.com/acme-org/acme/backend/worker.(*Worker).Start.func3 |
| code.lineno
| Line number of the file where the log was emitted.
| 20 |
| level
| The log level.
| info |
| message
| The log message.
| public-graph graphql request failed |
| span_id
| Span ID that contains this log.
| 528a54addf6f91cc |
| trace_id
| Trace ID that contains this log.
| 7654ff38c4631d5a51b26f7e637eea3c |
| Service and application
| environment
| The environment key, based on the SDK credentials used in the observability SDKs .
| production |
| host.name
| The hostname.
| ip-172-31-5-211.us-east-2.compute.internal |
| os.description
| Description of the operating system.
| Alpine Linux 3.17.2 (Linux ip-172-31-5-211.us-east-2.compute.internal 5.10.167-147.601.amzn2.aarch64 #1 SMP Tue Feb 14 21:50:23 UTC 2023 arch64) |
| os.type
| Type of operating system.
| linux |
| secure_session_id
| Session ID that contains the log.
| wh1jcuN5F9G6Ra5CKeCjdIk6Rbyd |
| service_name
| Name of the service specified in the SDK plugin. To learn more, read Versioning sessions and errors .
| private-graph |
| service_version
| Version of the service specified in the observability SDK plugin. To learn more, read Versioning sessions and errors .
| e1845285cb360410aee05c61dd0cc57f85afe6da |
| source
| General origin of the log.
| backend |