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---
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labels:
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products:
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- oss
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title: 'Math example'
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---
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- `$A` returns series `{host="web01"} 30` and `{host="web02"} 20`.
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- `$B` returns series `{host="web01"} 10` and `{host="web02"} 0`.
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- `$A + $B` returns `{host="web01"} 40` and `{host="web02"} 20`.
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