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<h4><aname="api-metric-names" href="#api-metric-names">What are valid metric names?</a></h4>
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<p>Metric names must start with a letter, and after that may contain ascii alphanumerics, underscore and periods. Other characters will get converted to underscores. There is no max length. Unicode is not support.</p>
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<h4>What are valid tags?</h4>
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<h4><aname="api-tags" href="#api-tags">What are valid tags?</a></h4>
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<p>Tags must start with a letter, and after that may contain alphanumerics, underscores, minuses, colons, periods and slashes. Other characters will get converted to underscores. Tags can be up to 200 characters long and support unicode.</p>
<h4><aname="arch-cloud-or-server" href="#arch-cloud-or-server">Is datadog a cloud service or server application?</a></h4>
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<p>It's primarily a cloud service, but if you want to collect data on your servers, there is an agent you'll need to install. We never make any direct connections to your infrastructure. For cloud integrations, we connect to them using the credentials you provide to us.</p>
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<h4>What's the difference between Graphite's query language and Datadog's?</h4>
<h4><aname="arch-graphite-differences" href="#archive-graphite-differences">What's the difference between Graphite's query language and Datadog's?</a></h4>
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<p>In terms of metric naming, we differ a little with Graphite in that a metric query is defined by a metric name and a scope, where a scope is one or more tags. To translate:</p>
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<blockquote>
@@ -91,3 +128,4 @@ <h4>What's the difference between Graphite's query language and Datadog's?</h4>
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<p>Which would graph stacked area series for each http_method value like GET, POST, etc.</p>
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