# Log source "unknown" in Observability Overview

**URL:** <https://discuss.elastic.co/t/log-source-unknown-in-observability-overview/262568>\
**Category:** Logs\
**Created:** [January 28, 2021, 9:23pm UTC](https://discuss.elastic.co/t/log-source-unknown-in-observability-overview/262568 "2021-01-28T21:23:10Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![felixbarny](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/felixbarny/32/27341_2.png) [@felixbarny](https://discuss.elastic.co/u/felixbarny)\
**Post date:** [January 29, 2021, 7:29am UTC](https://discuss.elastic.co/t/log-source-unknown-in-observability-overview/262568/2 "2021-01-29T07:29:39Z")

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Hi and welcome to the forum 👋

You'll have to populate the `event.dataset` field for that which helps you to differ between log streams. The default value our [ECS logging](https://www.elastic.co/guide/en/ecs-logging/overview/master/intro.html) libraries use is `${serviceName}.log`, for example `my-app.log`.

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_[View the full topic](https://discuss.elastic.co/t/log-source-unknown-in-observability-overview/262568)._