Metrics formulas
You can combine metrics into formulas to get additional insights.
For example, compare an error count metric to the overall count, to determine error percentage.
Here, we start with the side-by-side metric display of aws_logs_call_count and aws_logs_error_count demonstrated in Add query and Separate queries sections.
Add formula
You can combine metrics over facets or labels into formulas, to get additional insights.
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To add a formula, click
(Add Formula).
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The empty formula option appears in interface as line
(1), under the query lines.
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Type the formula in the text box next to label
(1).Here, use \(\frac{b}{a}100\) to calculate the percentage of errors across the time series.
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The interface displays graphs for both queries and the new formula.
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The error percentage chart is a starting point for creating a new alert. See Metric alerts and Create alerts.
