The GitHub Availability Report
I don't understand the first one:<p><pre><code>    a shared database table’s
    auto-incrementing ID column
    exceeded the size that can
    be represented by the MySQL
    Integer type
</code></pre>
Followed by:<p><pre><code>    GitHub’s monitoring systems
    currently alert when tables
    hit 70% of the primary key
    size
</code></pre>
So why was there no alert?