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lt

Less than operator. There are two variants of the :lt operator.

Choosing

Input Stack:
v: String
k: String
Output Stack:
(k < v): Query
 

This first variant is used for choosing the set of time series to operate on. It selects time series that have a value for a key that is less than a specified value. For example, consider the following query:

name,ssCpuSystem,:lt

When matching against the sample data in the table below, the highlighted time series would be included in the result set:

Namenf.appnf.node
ssCpuUser alerttest i-0123
ssCpuSystem alerttest i-0123
ssCpuUser nccp i-0abc
ssCpuSystem nccp i-0abc
numRequests nccp i-0abc
ssCpuUser api i-0456

Math

Input Stack:
ts2: TimeSeriesExpr
ts1: TimeSeriesExpr
Output Stack:
(ts1 < ts2): TimeSeriesExpr
 

Compute a new time series where each interval has the value (a < b) where a and b are the corresponding intervals in the input time series. For example:

Time a b a < b
00:01 0.0 0.0 0.0
00:01 0.0 1.0 1.0
00:02 1.0 0.0 0.0
00:03 1.0 1.0 0.0
00:04 0.5 1.7 1.0

The result will be a signal time series that will be 1.0 for intervals where the condition is true and 0.0 for intervals where it is false.

Example:

BeforeAfter
minuteOfHour,:time,
hourOfDay,:time
minuteOfHour,:time,
hourOfDay,:time,
:lt