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docs: fix prometheus metric name and slack webhook backtick (#28085)
## What Two small monitoring-doc fixes surfaced by the runtime drift sweep. ### `docs/admin/integrations/prometheus.md` The native-histograms list showed `coderd_template_coderd_template_workspace_build_duration_seconds` (doubled `coderd_template_` prefix). The correct metric name, per the metrics table earlier on the same page and the generated metrics, is `coderd_template_workspace_build_duration_seconds`. ### `docs/admin/monitoring/notifications/slack.md` The `CODER_NOTIFICATIONS_WEBHOOK_ENDPOINT` export ended with a stray backtick: ``` export CODER_NOTIFICATIONS_WEBHOOK_ENDPOINT=http://localhost:6000/v1/webhook` ``` On paste, bash treats the trailing backtick as an unterminated command substitution and errors. Removed it. Both reproduced during the runtime drift sweep and verified against `main`. Linear: [DOCS-647](https://linear.app/codercom/issue/DOCS-647/docs-fix-monitoring-examples-prometheus-metric-name-slack-webhook) > This PR was created with AI assistance (Coder Agents).
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@@ -364,7 +364,7 @@ The following metrics support native histograms:
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* `coderd_workspace_creation_duration_seconds`
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* `coderd_prebuilt_workspace_claim_duration_seconds`
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* `coderd_template_coderd_template_workspace_build_duration_seconds`
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* `coderd_template_workspace_build_duration_seconds`
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Native histograms are an **experimental** Prometheus feature that removes the need to predefine bucket boundaries and allows higher-resolution buckets that adapt to deployment characteristics.
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Whether a metric is exposed as classic or native depends entirely on the Prometheus server configuration (see [Prometheus docs](https://prometheus.io/docs/specs/native_histograms/) for details):
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@@ -196,7 +196,7 @@ To enable webhook integration in Coder, define the POST webhook endpoint
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matching the deployed Slack bot:
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```sh
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export CODER_NOTIFICATIONS_WEBHOOK_ENDPOINT=http://localhost:6000/v1/webhook`
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export CODER_NOTIFICATIONS_WEBHOOK_ENDPOINT=http://localhost:6000/v1/webhook
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```
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Finally, go to the **Notification Settings** in Coder and switch the notifier to
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