Promethues

https://prometheus.io/docs/introduction/overview/

Data

• Sample， 二维数据，包含一个float64 value和一个timestamp

Metric Type

The Prometheus server does not yet make use of the type information and flattens all data into untyped time series

• Counter
• Gauge
• Histogram
• Summary

Query

Expression Data Types

• Instant vector - a set of time series containing a single sample for each time series, all sharing the same timestamp
• Range vector - a set of time series containing a range of data points over time for each time series
• Scalar - a simple numeric floating point value
• String - a simple string value; currently unused

an expression that returns an instant vector is the only type that can be directly graphed.

Literals

String

Strings may be specified as literals in single quotes, double quotes or backticks.

Float literals

Time series Selectors

Instant vector selectors

• regex
• {name='metric_name'}

Range Vector Selectors

• a set of instant time series

Duration

Offset

Note that the offset modifier always needs to follow the selector immediately

@ modifier

Operator

• matching behavior between two instant vector

Binary

Arithmetic binary operators

• scalar/scalar, instant vector/scalar, instant vector/instant vector

Trigonometric binary operators

• vector/vector

Comparison binary operators

• scalar/scalar, vector/scalar, vector/vector
• > bool 0.5

Logical/set binary operators

• vector/vector
• and, or, unlesss
• match all in the right by default

Vector matching

• on, ignoring
• group_left, group_right

Aggregation operators

Binary operator precedence