Ownership into GenericSets

docs/how-to-write-metrics.md

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      Use of this source code is governed by a BSD-style license that can be
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 # How to Write Metrics
 
 Timeline-Based Measurement v2 is a system for computing metrics from traces.
 
 A TBM2 metric is a Javascript function that takes a trace Model and produces
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    ![](/docs/images/how-to-write-metrics-revision.png)
 
  * [BuildbotInfo](/tracing/tracing/value/diagnostics/buildbot_info.html):
    This is automatically attached to every Histogram produced by Chrome's
    performance testing buildbots. Structurally, it's a class with explicit named
    fields. Conceptually, it contains information about the buildbot process that
    ran telemetry. Visually, it is displayed as a table.
 
    ![](/docs/images/how-to-write-metrics-buildbot.png)
 
- * [Ownership](/tracing/tracing/value/diagnostics/ownership.html):
-   This is automatically attached to every Histogram produced by Temeletry.
-   Structurally, it's a class with explicit named fields. Conceptually, it
-   contains information about the owners of benchmarks run by Telemetry, such
-   as the owners' emails addresses and Monorail component.
-
 ### Other Diagnostics
 
  * [Scalar](/tracing/tracing/value/diagnostics/scalar.html):
    Metrics must not use this, since it is incapable of being merged. It is
    mentioned here for completeness. It wraps a Scalar, which is just a
    unitted number. This is only to allow Histograms in other parts of the trace
    viewer to display number sample diagnostics more intelligently than
    GenericSet can. If a metric wants to display number sample diagnostics
    intelligently, then it should use RelatedHistogramSet or RelatedHistogramMap;
    if it does not want to monitor changes in those numbers, then the TBM2
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   * Instead of having one category for all story grouping keys, each grouping
     individual grouping key may be listed as a category. For example, in Page
     Cycler v2 benchmarks, the "cache_temperature" grouping key would be
     displayed as a category.
 * Choosing groups builds a hierarchy of histograms that is filled in by merging
   histograms from the bottom up. Expanding the rows of histogram-set-table, any
   leaf nodes are histograms that were loaded, and their ancestors are computed by
   merging.
 * histogram-set-table uses the "label" property of TelemetryInfo to define the
   columns of the table.