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Add function label_replace. #3047

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merged 2 commits into from
Dec 8, 2020
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cyriltovena
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You might be wondering why do we need label_replace when we already have label_format.

Well for two reasons:

  1. It's nice to have something similar to Prometheus, so users building metric queries will feel right at home.
  2. Interestingly, they are quite different in how they execute. label_format executes for every log line, however label_replace execute for every sample. Since you aggregate log lines into samples then label_replace is way more efficient at scale.

Signed-off-by: Cyril Tovena [email protected]

You might be wondering why do we need label_replace when we already have label_format.
Well for two reasons:

1. It's nice to have something similar to Prometheus, so users building metric queries will feel right at home.
2. Interestingly, they are quite different in how they execute. label_format executes for every log line, however label_replace execute for every sample. Since you aggregate log lines into sample then label_replace is way more efficient at scale.

Signed-off-by: Cyril Tovena <[email protected]>
@cyriltovena
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Fixes #2883

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Codecov Report

Merging #3047 (5d966a9) into master (4e7a123) will increase coverage by 0.06%.
The diff coverage is 91.52%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master    #3047      +/-   ##
==========================================
+ Coverage   62.78%   62.85%   +0.06%     
==========================================
  Files         186      186              
  Lines       15847    15906      +59     
==========================================
+ Hits         9949     9997      +48     
- Misses       4974     4983       +9     
- Partials      924      926       +2     
Impacted Files Coverage Δ
pkg/logql/lex.go 90.90% <ø> (ø)
pkg/logql/ast.go 86.48% <88.88%> (+0.18%) ⬆️
pkg/logql/evaluator.go 91.77% <93.75%> (+0.12%) ⬆️
pkg/querier/queryrange/limits.go 91.66% <0.00%> (-4.17%) ⬇️
pkg/querier/queryrange/downstreamer.go 95.29% <0.00%> (-2.36%) ⬇️
pkg/storage/stores/shipper/compactor/table.go 60.27% <0.00%> (-1.37%) ⬇️

@cyriltovena cyriltovena merged commit 3f0800d into grafana:master Dec 8, 2020
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3 participants