0060e695b5
Add a new shared config stanza which all boulder components can use to configure their Open Telemetry tracing. This allows components to specify where their traces should be sent, what their sampling ratio should be, and whether or not they should respect their parent's sampling decisions (so that web front-ends can ignore sampling info coming from outside our infrastructure). It's likely we'll need to evolve this configuration over time, but this is a good starting point. Add basic Open Telemetry setup to our existing cmd.StatsAndLogging helper, so that it gets initialized at the same time as our other observability helpers. This sets certain default fields on all traces/spans generated by the service. Currently these include the service name, the service version, and information about the telemetry SDK itself. In the future we'll likely augment this with information about the host and process. Finally, add instrumentation for the HTTP servers and grpc clients/servers. This gives us a starting point of being able to monitor Boulder, but is fairly minimal as this PR is already somewhat unwieldy: It's really only enough to understand that everything is wired up properly in the configuration. In subsequent work we'll enhance those spans with more data, and add more spans for things not automatically traced here. Fixes https://github.com/letsencrypt/boulder/issues/6361 --------- Co-authored-by: Aaron Gable <aaron@aarongable.com> |
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| .gitignore | ||
| LICENSE | ||
| README.md | ||
| backoff.go | ||
| context.go | ||
| exponential.go | ||
| retry.go | ||
| ticker.go | ||
| timer.go | ||
| tries.go | ||
README.md
Exponential Backoff 
This is a Go port of the exponential backoff algorithm from Google's HTTP Client Library for Java.
Exponential backoff is an algorithm that uses feedback to multiplicatively decrease the rate of some process, in order to gradually find an acceptable rate. The retries exponentially increase and stop increasing when a certain threshold is met.
Usage
Import path is github.com/cenkalti/backoff/v4. Please note the version part at the end.
Use https://pkg.go.dev/github.com/cenkalti/backoff/v4 to view the documentation.
Contributing
- I would like to keep this library as small as possible.
- Please don't send a PR without opening an issue and discussing it first.
- If proposed change is not a common use case, I will probably not accept it.