sentry: Implement performance tracing

A new init param and env var for our sentry integrations to enable performance tracing

traces_sample_rate (env var SWH_SENTRY_TRACES_SAMPLE_RATE): an optional float that defaults to None. None means completely disable tracing, 0.5 means enable tracing on 50% of the transactions (for example in swh-web a transaction means a whole HttpRequest cycle).

assigned to @rboyer

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I'm wondering if the trace propagation (across multiple services) will be as magic as they pretend it is.

I also wonder whether our sentry install will like the increased load, but there's not much else to do than TIAS...

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I'm wondering if the trace propagation (across multiple services) will be as magic as they pretend it is.

Every time, it works 60% of the time

I also wonder whether our sentry install will like the increased load, but there's not much else to do than TIAS...

In my previous job, we were at 30% in production and the impact was not insignificant but the insights it provided made it worthwhile.

I really meant whether sentry.softwareheritage.org as deployed could cope with the increased data volume, I have no doubts the insights would be useful!

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marked this merge request as draft

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marked this merge request as ready

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approved this merge request

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merged

mentioned in issue swh/infra/sysadm-environment#5535