# `Parapet.SLO.HTTP`
[🔗](https://github.com/szTheory/parapet/blob/v1.0.0/lib/parapet/slo/http.ex#L1)

Provides an out-of-the-box SLO definition for HTTP request serving.

> #### Experimental {: .warning}
>
> This module is **experimental** in v1.x. Its API may change in a minor release with a
> single-version notice in CHANGELOG.md. See
> [Stability & Deprecation Policy](stability.html) for details.

# `register`

Registers the HTTP SLO with the Parapet.SLO registry.

## Options

  * `:objective` - The target objective percentage (default: `99.9`).
  * `:good_events` - PromQL string for good events.
    (default: `"sum(rate(parapet_http_server_duration_milliseconds_count{status_code=~"2..|3.."}[5m]))"`)
  * `:total_events` - PromQL string for total events.
    (default: `"sum(rate(parapet_http_server_duration_milliseconds_count[5m]))"`)
  * `:runbook` - URL to the runbook for this SLO. (default: `"https://example.com/runbooks/http-slo"`)

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*Consult [api-reference.md](api-reference.md) for complete listing*