Custom Spans

Instrument parts of your Flutter app by hand with custom spans to measure how long specific operations take, alongside the spans Luciq captures for you.

Overview

Custom Spans allow you to manually instrument parts of your application and measure how long specific operations take. This helps you track performance for specific spans that are not automatically captured.

Custom spans appear in the Spans timeline alongside automatically collected spans. They will appear inside all APM metrics we already capture such as app launches, screen loading, network logs and Flows. The backend correlates the custom span with its respective metrics based on their timestamps.

Setup Custom Spans

To log a new custom spans, please use the below APIs

Dart

final CustomSpan? span = await APM.startCustomSpan(String name)

span.end()

To log a completed span, use the below API

Dart

APM.addCompletedCustomSpan(String name,DateTime startDate, DateTime endDate) 

Considerations for creating Custom Spans

1. APM must be enabled to use Custom Spans
2. Luciq SDK must be initialized before calling the API
3. Custom span name cannot be empty
4. Maximum 100 spans per session (older spans may be dropped if the limit is exceeded