PromQL, dữ liệu thiếu và trạng thái cảnh báo

Nội dung luyện tập

• sum retains group labels
• comparison filters keeps value
• absent not zero sample
• range left boundary excluded
• irate last two samples
• default vector label mismatch
• zero fill preserves known jobs
• unless is presence not truthiness
• increase extrapolates fraction
• counter resets count decreases
• many to one group left
• bool zero still activates alert
• for requires continuous presence
• classic quantile interpolation
• range average sample weighting
• zero traffic ratio not proof
• missing target needs expected inventory
• recording rule history not recomputed
• dynamic alert label resets identity
• pushgateway retains dead job series

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