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<p>Understand the syntax of Monitoring Query Language (MQL) expressions and review valid values for interval, statistic, and predicate operators in MQL expressions.</p><p>MQL syntax governs expressions for querying metrics that are published to the Monitoring service. MQL expressions define queries (including alarm queries). MQL acts on aggregated data. </p><p id="isPasted"><em>Some components can appear in an MQL expression multiple times. For example, you can use two grouping functions (as in groupBy(), followed by a statistic, followed by grouping()). You can also nest queries.</em></p><p><em>You can also join multiple queries into a single query.</em></p><p><em>For alarms in the Console, the absent() statistic is listed under Operator.</em></p>
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