title: When are API levels marked as obsolete in the Android SDK Manager?
body: <p>I noticed that within the Android SDK Manager, it appears that most API levels below 15 are marked as obsolete (including <a href="https://stackoverflow.com/questions/8353503/why-is-android-api-level-9-obsolete">API level 9</a>). But then I saw that API levels 8 and 10 are <em>not</em> marked as obsolete.</p>
  
  <p>Why is that? And when will an Android API level be marked as obsolete?</p>
  
  <p>PS: The <a href="http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels" rel="nofollow noreferrer">documentation of API levels</a> does not mention obsoleteness of API levels.</p>