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Loki — A Log Store That Does Not Index Logs
The decision to index only labels changes everything
중급 · Lessons 31 · Lab 10
Start the lab
Curriculum
The Design Decision
The Choice Not to Index
reading
One Label Makes It Thirty Times More Expensive
lab
Loki Labels Check
quiz
Loki Model Check
quiz
Asking With LogQL
LogQL Has Three Parts
reading
All the logs were there; I just did not know what to ask
lab
LogQL Check
quiz
Pulling values out of the line body
When a parser silently extracts nothing
reading
Not a single error, yet the 5xx count was a third of the real one
lab
Quiz: LogQL parsers
quiz
How much a query actually reads
Line filters do not reduce how much is read
reading
Two queries with the same answer: one took four minutes, the other two seconds
lab
Quiz: query cost
quiz
Turning logs into numbers
Why p50 and p95 come out the same
reading
I measured p95 from logs and got the same number as p50
lab
Quiz: metrics from logs
quiz
Renaming at query time
Why level="error" returned zero rows
reading
I reported zero errors; there were thirty in that hour
lab
Quiz: shaping labels and lines
quiz
Why a line you just pushed is not visible
The push returns 204 but the query comes back empty
reading
We replayed two hours of logs and the screen showed nothing
lab
Quiz: ingesters and chunks
quiz
Retention and deletion
If you never turn it on, logs stay forever
reading
It vanished from the screen immediately, yet storage stayed flat for a month
lab
Quiz: retention and deletion
quiz
Limits and truncated answers
The answer that gets cut silently is the dangerous one
reading
We reported the incident start forty minutes too late
lab
Quiz: query limits
quiz
Limits on the write side
Fix a 400, wait out a 429
reading
I left retries on and went home; by morning the queue was full
lab
Quiz: ingestion limits
quiz
Reference docs
Grafana Loki — 개요
Loki — LogQL
Loki — 라벨 모범 사례
Loki — 스토리지 구성