Tracing for our WikiLambda and Wikifunctions is visualized on Jaeger UI.
Filter for mw-wikifunctions for our WikiLambda requests and wikifunctions for the services. However, you should be able to see the full request journey if the call to the API makes it to the services.

To filter by request-id

• In the "Tags" field on the left-hand side, preface your request-id with guid:x-request-id=, i.e. guid:x-request-id=0c81d65b-85d8-9bf1-b316-72ea2c12c56b
• You can also view the log events of your request-id on Logstash per Trace event by expanding each span and looking at the 'Tags' section. Here, you will see the guid:x-request-id key whose value (your request-id) directly links to the event in Logstash.

Supplementary info:

• Tracing 101
• MediaWiki Telemetry Headers
• Propagating Trace Headers
• Jaeger documentation
• Tracing for Node services