# Metrics Operators

This guide describes Sumo Logic metrics operators and provides usage examples.

## Guide contents​

In this section, we'll introduce the following concepts: #### accum

Learn how to create a series of running totals for each metric time series. #### along

Learn how to control what results are joined based on the value of one or more result fields. #### avg

Learn how to calculate the average of all matching time series. #### bottomk

Learn how to apply a specified aggregation function to the time series that match the query selector. #### count

Learn how to count the total number of time series that match the query. #### delta

Learn how to compute the backward difference at each data point in the time series. #### eval

Learn how to evaluate a time series based on a user-specified arithmetic or mathematical function. #### ewma

Learn how to compute an EWMA on the data points returned by the query for the selected time range. #### fillmissing

Learn how to fill empty time slices in metric query results with a derived data point. #### histogram_quantile

Learn how to calculate the φ-quantile from the buckets of a histogram. #### in

Learn how to use this operator in a metrics query selector as shorthand for multiple OR conditions. #### max

Learn how to calculate the maximum value of the time series that match the query. #### min

Learn how to calculate the minimum value of the time series that match the query. #### outlier

Learn how to identify metrics data points that are outside the range of expected values. #### parse

Learn how to parse the specified field to create new fields to use in the metrics query. #### predict

Learn how to take a single time series metric to predict future values. #### pct

Learn how to calculate the nth percentile of values of the input series for each time interval. #### quantize

Learn how to use this operator to control Sumo’s quantization behavior. #### rate

Learn how to calculate the per-second rate of change between consecutive data points. #### stddev

Learn how to measure the magnitude of deviations between the values in a time series. #### sum

Learn how to calculate the sum of the metrics values that match the query. #### timeshift

Learn how to shift the time series from your metrics query by a specified period of time. #### topk

Learn to apply a specified aggregation function to the time series that match the query selector. #### where

Learn how to filter out entire time series, or individual data points within a time series.

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