Trace Context in Logs
Adding trace context to application logs provides the ability to correlate the log messages from a traced transaction, and if sampled, the log messages to the transaction trace detail.
The Ruby agent can automatically add the trace context to logs. It will do so by adding a string like ‘ao.traceId=7435A9FE510AE4533414D425DADF4E180D2B4E36-0' to the end of each logged line.
This feature can be enabled in the Configuration File via the
AppOpticsAPM::Config[:log_traceId] setting, which takes the following options:
:sampledonly include the Trace ID for sampled requests
:tracedinclude the Trace ID for all traced requests
:alwaysalways add a Trace ID. It will be ‘0000000000000000000000000000000000000000-0’ when there is no tracing context.
Automatic insertion works for any Logger that uses
ActiveSupport::Logger::SimpleFormatter < Logger::Formatter
ActiveSupport::TaggedLoggingwhich usually extends
Logger::Formatterwith its own formatter
logging are also supported.
Using the SDK
If your logger is not supported for automatic insertion, or for finer control, you can use the AppOpticsAPM::SDK to add Trace ID to application logs. Below are examples for popular logging libaries.
Lograge is a formatter for Rails logs currently not supported for automatic insertion. Instead you can use its
custom_options and our SDK to configure lograge to include the Trace ID:
Lograge.custom_options = lambda do |event| AppOpticsAPM::SDK.current_trace.hash_for_log end
hash_for_log SDK method respects the configuration settings for
AppOpticsAPM::Config[:log_traceId]. For example: It will return
an empty hash if the setting is
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