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For most metrics, this value is Sum/Count. Average вЂ“ the average of the metric values captured over the aggregation interval.Count doesn't look at the value of the measurement, only the number of records. Count вЂ“ the number of measurements captured over the aggregation interval.Sometimes referred to as the Total aggregation. Sum вЂ“ the sum of all values captured over the aggregation interval.Metrics explorer hides the aggregations that are irrelevant and cannot be used for a given metric. There are five basic aggregation types available in the metrics explorer. Once selected, the metric values that were captured during each time granularity interval are aggregated and placed onto the chart - one datapoint per interval. If you donвЂ™t make an explicit selection, the time granularity is automatically selected based on the currently selected time range. You select the size of the time granularity using the Metrics Explorer time picker panel. When you plot a chart, the values of the selected metrics are retrieved from the database and then separately aggregated based on the chosen time granularity (also known as time grain). In Azure, most metrics are stored in the Azure Metrics time-series database.

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Metrics are a series of values stored with a time-stamp. For example, taking an average of multiple values. Aggregate вЂ“ The process of taking multiple input values and then using them to produce a single output value via the rules defined by the aggregation type.Aggregation type вЂ“ A type of statistic calculated from multiple metric values.

The time granularity value should be smaller than the selected time range to be useful, otherwise just one value is shown for the entire chart.

Time granularity or time grain вЂ“ The time period used to aggregate values together to allow display on a chart.

Time range вЂ“ The time period displayed on a chart.

Time interval вЂ“ The period of time between the gathering of two metric values.

Time period вЂ“ A generic period of time.

Time-Series database - A database optimized for the storage and retrieval of data points all containing a value and a corresponding time-stamp.

Metric value вЂ“ A single measurement value gathered for a specific resource.

Viewing different aggregations on a chart requires that you understand how metrics explorer handles them. The default makes sense in the basic scenarios, but you can use different aggregations to gain more insights about the metric. When you add a metric to a chart, metrics explorer automatically pre-selects its default aggregation. This is a complex topic and not necessary to understand all the information in this article to use Azure Monitor metrics effectively. This article also applies to standard Application Insights metrics. This article explains the aggregation of metrics in the Azure Monitor time-series database that back Azure Monitor platform metrics and custom metrics.