以下是openGemini对Prometheus的函数和算子支持程度，总体已达90%。欢迎开发者参与进来一起完善。

具体算子和函数的功能介绍，请参考【prometheus中文文档】

PromQL函数支持程度

函数名称	是否支持
Count()	✔
Count_values()	✖
Avg()	✔
Max()	✔
Min()	✔
Sum()	✔
TopK()	✔
Bottomk()	✔
Limitk()	✖
Limit_ratio()	✖
Stddev()	✔
Irate()	✔
Rate()	✔
Absent()	✔
Stdvar()	✔
Quantile()	✔
Delta()	✔
Idelta()	✔
Increase()	✔
Derives()	✔
Count_values()	✔
Group()	✖
Abs()	✔
Acos()	✔
Asim()	✔
Atan()	✔
Atan2()	✔
Ceil()	✔
Cos()	✔
Exp()	✔
Floor()	✔
Ln()	✔
Log2()	✔
Log10()	✔
Round()	✔
Sin()	✔
Sqrt()	✔
Tan()	✔
Label_join	✔
Label_replace	✔
Day_of_month	✔
Day_of_week	✔
Day_of_year	✔
Days_in_month()	✔
Hour()	✔
Minute()	✔
Month()	✔
Time()	✔
Timestamp()	✔
Year()	✔
Clamp()	✔
Clamp_max()	✔
Clamp_min()	✔
Sgn()	✖
Acosh()	✖
Asinh()	✖
Atanh()	✖
Cosh()	✖
Sinh()	✖
Deg()	✖
Pi()	✖
Rad()	✖
Sort()	✖
Sort_desc()	✖
Sort_by_label()	✖
Sort_by_label_desc()	✖
Holt_winters()	✔
Predict_linear()	✔
Histogram_quantile()	✔
Histogram_count()	✖
Histogram_sum()	✖
Histogram_fraction()	✖
Histogram_avg()	✖
Histogram_stddev()	✖
Histogram_stdvar()	✖
Scalar()	✔
Vector()	✔
Avg_over_time(range-vector)	✔
Min_over_time(range-vector)	✔
Max_over_time(range-vector)	✔
Sum_over_time(range-vector)	✔
Count_over_time(range-vector)	✔
Stddev_over_time(range-vector)	✔
Stdvar_over_time(range-vector)	✔
Last_over_time(range-vector)	✔
Quantile_over_time(scalar, range-vector)	✔
Absent_over_time(range-vector)	✖
Mad_over_time(range-vector)	✖
Changes	✔
Resets	✔
Present_over_time(range-vector)	✔

Operators支持程度

Operator名称	是否支持	算子功能描述
+	✔
-	✔
*	✔
/	✔
%	✔
^	✔
==	✔
!=	✔
>	✔
<	✔
>=	✔
<=	✔
and	✔
or	✔
unless	✔
on	✖
ignoring	✖
group_left	✖
group_right	✖