# SLO, APM Availability?

**URL:** <https://discuss.elastic.co/t/slo-apm-availability/357446>\
**Category:** SLO\
**Created:** [April 15, 2024, 4:01pm UTC](https://discuss.elastic.co/t/slo-apm-availability/357446 "2024-04-15T16:01:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![GregoryJC](https://avatars.discourse-cdn.com/v4/letter/g/c37758/32.png) [@GregoryJC](https://discuss.elastic.co/u/GregoryJC)\
**Post date:** [April 15, 2024, 4:01pm UTC](https://discuss.elastic.co/t/slo-apm-availability/357446/1 "2024-04-15T16:01:43Z")

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With the new SLO feature what is APM availability actually monitoring/measuring? It is not mentioned in the documentation and isn't clear when using it what it defines as a good event vs a bad event.

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**Author:** ![Kevin\_Delemme](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kevin_delemme/32/108920_2.png) [@Kevin\_Delemme](https://discuss.elastic.co/u/Kevin_Delemme)\
**Post date:** [April 15, 2024, 5:37pm UTC](https://discuss.elastic.co/t/slo-apm-availability/357446/2 "2024-04-15T17:37:26Z")

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Hi @GregoryJC,  
We are filtering all the APM documents with

```auto
{ term: { 'metricset.name': 'transaction' } },
{ terms: { 'event.outcome': ['success', 'failure'] } },

```

Then the good events are the documents with `event.outcome:"success"` and the total events is a match\_all

If the code can help: [kibana/x-pack/plugins/observability\_solution/slo/server/services/transform\_generators/apm\_transaction\_error\_rate.ts at main · elastic/kibana · GitHub](https://github.com/elastic/kibana/blob/main/x-pack/plugins/observability_solution/slo/server/services/transform_generators/apm_transaction_error_rate.ts#L118-L171)

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<div class="post-metadata">

**Author:** ![GregoryJC](https://avatars.discourse-cdn.com/v4/letter/g/c37758/32.png) [@GregoryJC](https://discuss.elastic.co/u/GregoryJC)\
**Post date:** [April 15, 2024, 6:27pm UTC](https://discuss.elastic.co/t/slo-apm-availability/357446/3 "2024-04-15T18:27:18Z")

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Perfect, thank you Kevin.