how-to-biz-monitoringlisted
Install: claude install-skill phoebefu6/phoebe-data-skills
# how-to-biz-monitoring
Data Analytics layer skill (layer 2 of the phoebe-data-skills 4-layer roadmap).
Most metric alerting is built backwards. Somebody picks a threshold, ships it,
and then spends a year tuning it against complaints. Nobody ever measures how
many real changes it missed, because the misses are by definition absent from
the alert log, and so the only available evidence is the alerts that fired -
the one population that cannot tell you anything about recall.
This skill builds the monitor in the opposite order: establish what normal looks
like, calibrate the null, control multiplicity, and only then choose a
threshold - with a bench that scores the result against changes you planted
yourself, so every number on the page is measured.
Showcase walkthrough (Everrest marketplace case, real executed charts):
`docs/how-to-biz-monitoring/` in https://github.com/phoebefu6/phoebe-data-skills
## Where this sits in the lineage
`raw dump -> lake -> warehouse -> marts` **-> the thing that watches the marts**.
Reads the stage-3 marts. It sits beside `how-to-metric-to-scorecard`, which
reports a metric on a schedule, and `how-to-data-quality`, which gates the data
on the way in. The boundary matters and is the first rule below.
## The seven rules
1. **Anomaly detection is not data quality.** They fail differently. A duplicate
load that inflates every day of a month by a quarter is invisible to a
threshold on the metric, because the baseline simply learns it: in