PCP: Resolve nested derived metric definitions for devices #1483
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Previously these expressions were (incorrectly) silently failing to evaluate because a derived metric expression was geing nested which isn't valid. Now libpcp generates several warnings like: "Semantic error: derived metric htop.screen.disks.read_await: operand disk.dev.r_await: Illegal nested derived metric" Fortunately they're all simple expressions so just unwinding the nesting is the simplest fix. Add in help text for good measure.
BenBE
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enhancement
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Previously these expressions were (incorrectly) silently failing to evaluate because a derived metric expression was geing nested which isn't valid. Now libpcp generates several warnings like: "Semantic error: derived metric htop.screen.disks.read_await: operand disk.dev.r_await: Illegal nested derived metric"
Fortunately they're all simple expressions so just unwinding the nesting is the simplest fix. Add in help text for good measure.