           </p>
                        </section>
                        <section data-type="sect1" id="worrying-about-your-tail-or-instrumentation-and-performance-Yms9Ck">
                            <h2>
                                Worrying About Your Tail (or, Instrumentation and Performance)
                            </h2>
                            <p>
                                <a data-type="indexterm" data-primary="monitoring distributed systems" data-secondary="instrumentation and perf