grafana/public/app/plugins/datasource/mysql/partials/annotations.editor.html

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      <textarea
        rows="10"
        class="gf-form-input"
        ng-model="ctrl.annotation.rawQuery"
        spellcheck="false"
        placeholder="query expression"
        data-min-length="0"
        data-items="100"
        ng-model-onblur
        ng-change="ctrl.panelCtrl.refresh()"
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      <label class="gf-form-label query-keyword" ng-click="ctrl.showHelp = !ctrl.showHelp">
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    <pre class="gf-form-pre alert alert-info"><h6>Annotation Query Format</h6>
An annotation is an event that is overlaid on top of graphs. The query can have up to four columns per row, the <i>time</i> or <i>time_sec</i> column is mandatory. Annotation rendering is expensive so it is important to limit the number of rows returned.

- column with alias: <b>time</b> or <i>time_sec</i> for the annotation event time. Use epoch time or any native date data type.
- column with alias: <b>timeend</b> for the annotation event end time. Use epoch time or any native date data type.
- column with alias: <b>text</b> for the annotation text
- column with alias: <b>tags</b> for annotation tags. This is a comma separated string of tags e.g. 'tag1,tag2'


Macros:
- $__time(column) -&gt; UNIX_TIMESTAMP(column) as time (or as time_sec)
- $__timeEpoch(column) -&gt; UNIX_TIMESTAMP(column) as time (or as time_sec)
- $__timeFilter(column) -&gt; column BETWEEN FROM_UNIXTIME(1492750877) AND FROM_UNIXTIME(1492750877)
- $__unixEpochFilter(column) -&gt;  time_unix_epoch &gt; 1492750877 AND time_unix_epoch &lt; 1492750877
- $__unixEpochNanoFilter(column) -&gt;  column &gt;= 1494410783152415214 AND column &lt;= 1494497183142514872

Or build your own conditionals using these macros which just return the values:
- $__timeFrom() -&gt; FROM_UNIXTIME(1492750877)
- $__timeTo() -&gt;  FROM_UNIXTIME(1492750877)
- $__unixEpochFrom() -&gt;  1492750877
- $__unixEpochTo() -&gt;  1492750877
- $__unixEpochNanoFrom() -&gt;  1494410783152415214
- $__unixEpochNanoTo() -&gt;  1494497183142514872
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