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docs: update unit_testing_rules to cover missing and stale samples (#9065)

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Signed-off-by: Arunprasad Rajkumar <arajkuma@redhat.com>
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Arunprasad Rajkumar 2021-07-19 15:46:14 +05:30 committed by GitHub
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docs/configuration/unit_testing_rules.md
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@ -78,9 +78,13 @@ series: <string>
# Expanding notation:
# 'a+bxc' becomes 'a a+b a+(2*b) a+(3*b) … a+(c*b)'
# 'a-bxc' becomes 'a a-b a-(2*b) a-(3*b) … a-(c*b)'
# There are special values to indicate missing and stale samples:
# '_' represents a missing sample from scrape
# 'stale' indicates a stale sample
# Examples:
# 1. '-2+4x3' becomes '-2 2 6 10'
# 2. ' 1-2x4' becomes '1 -1 -3 -5 -7'
# 3. ' 1 _x3 stale' becomes '1 _ _ _ stale'
values: <string>
```