new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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Prometheus & alerting

Answer questions about Prometheus as documented today: the data model and metric types, PromQL including rate and increase and the traps of each, recording and alerting rules, Alertmanager routing grouping inhibition and silences, service discovery and relabelling, storage and retention, and federation.

1,108 notes · updated 2026-08-14 · trained 87%

since last sitting: +38 newly passed — this brain is learning · the verified changelog →

Paid brain

$19.00once · keeps working as the author updates it

Buying unlocks the notes for your agents and for you. Paid from your balance; 95% goes to the author. A brain can be copied once it is readable, so there are no refunds after the first read — decide from the exam questions and preview below. How paying works.

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Ask it things like

answers 36/40 on its latest exam · anti-bluff 2/3
In what file format must recording and alerting rules be written in Prometheus 2.0+?Recording & Alerting Rules✓
What does the __address__ label control?Service Discovery & Relabeling✓
By what mechanism does Alertmanager group multiple alerts into a single notification?Alertmanager: Routing, Grouping, Inhibition & Silences✓
What template variable gives access to the labels used for grouping alerts in Alertmanager?Alertmanager: Routing, Grouping, Inhibition & Silences✓
What metric type should be used for scrape meta-metrics like scrape_duration_seconds?Data Model & Metric Types✓
When Prometheus 3.0 scrapes metrics, what must the HTTP response include?Data Model & Metric Types✓
What is the standard metric naming convention for Prometheus?Data Model: Naming & Labels✓
Should label names be included in the metric name?Data Model: Naming & Labels✓

What it can answer

40 coverage checks
87%
Answers 38 of the exam's 43 questionsIt answers 38 questions, 38 more than last time, out of an exam that grew by 43.Nothing it used to answer has stopped working.
✓Recording & Alerting Rules6 / 6
✓Data Model: Naming & Labels5 / 5
▲Service Discovery & Relabeling5 / 6
✓Storage & Retention5 / 5
✓Alertmanager: Routing, Grouping, Inhibition & Silences4 / 4
▲Data Model & Metric Types4 / 5
▲PromQL: Rate & Increase Functions4 / 6
✓Federation & Advanced Features3 / 3
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Attacks survived

re-run weekly · 2026-08-10
✓gate-battery12/12 known hostile payloads caught by the ingest gate
✓injection-corpusevery active note scanned — no steering language
✓secret-corpusevery active note scanned — no keys or credentials

heuristic scans against known attack classes — measured and dated, not a promise of unpoisonability

What is inside

Note titles, so you can judge before you buy. The contents unlock on purchase.

  • Classic histogram ingestion as NHCB · data model & metric types
  • Native histogram average calculation · promql & querying
  • Native histogram definition and composition · data model & metric types
  • Recommendation: use native histograms · data model & metric types
  • Two approaches to distribution representation · data model & metric types
  • Summary vs histogram quantile aggregation · promql & querying
  • Four native histogram flavors · data model & metric types
  • Classic histogram and summary average calculation · promql & querying

Licence

CC BY-NC-SA 4.0

Use it, copy it, build on it, with credit. Selling it is not allowed.