title: What are the actual API limits?
body: <p>On the Stackdriver Trace documentation (<a href="https://cloud.google.com/trace/docs/quotas" rel="nofollow noreferrer">https://cloud.google.com/trace/docs/quotas</a>) I see there are <code>Quota unit cost per API call</code>, but that doesn't really tell me what the true API limits are.</p>
  
  <p>For something like <code>BatchWriteSpans</code> the unit cost is 1, but it doesn't tell me how many or how large can my Spans be.</p>
  
  <p>I would like to get more insight into the limits of the API and if there is anyway I can pull this information so that I don't have to hardcode these limits in my app.</p>