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This uses an ActiveRecord subscriber to get queries and calculate the
total query time from that. This means that the total will always be
consistent with the queries in the table. It does however mean that we
could potentially miss some queries that don't go through ActiveRecord.
Making this change also allows us to unify the response JSON a little
bit, making the frontend slightly simpler as a result.
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Since Redis timings appear to be increasing in production, this change
makes it easier to see what exactly which queries are being called and
where.
This is done by prepending modules in peek-redis to store the call
details.
This commit redact values for all SET commands (e.g. HMSET, GETSET,
etc.).
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This adds the backtrace to a table to show exactly where the Gitaly call
was made to make it easier to understand where the call originated.
This change also collapses the details in the same row to improve the
usability when there is a backtrace.
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These don't have performance data saved as they use Grape.
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We need to eagerly load the performance bar wrapper component
(`performance_bar/index.js`) when the page is loaded and the container element
is present, to ensure that we register the interceptor early enough in the
page's lifecycle.
However, we don't need to load the UI at that point. Not doing so means that we
can let Webpack extract the UI (`performance_bar/components/*`) into its own
chunk, so users who don't see the performance bar don't have to load too much
unnecessary JavaScript.
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But first, rewrite the performance bar in Vue:
1. Remove the peek-host gem and replace it with existing code. This also allows
us to include the host in the JSON response, rather than in the page HTML.
2. Leave the line profiler parts as here-be-dragons: nicer would be a separate
endpoint for these, so we could use them on Ajax requests too.
3. The performance bar is too fiddly to rewrite right now, so apply the same
logic to that.
Then, add features! All requests made through Axios are able to be tracked. To
keep a lid on memory usage, only the first two requests for a given URL are
tracked, though. Each request that's tracked has the same data as the initial
page load, with the exception of the performance bar and the line profiler, as
explained above.
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