[HCP Telemetry] Periodic Refresh for Dynamic Telemetry Configuration (#18168)
* OTElExporter now uses an EndpointProvider to discover the endpoint
* OTELSink uses a ConfigProvider to obtain filters and labels configuration
* improve tests for otel_sink
* Regex logic is moved into client for a method on the TelemetryConfig object
* Create a telemetry_config_provider and update deps to use it
* Fix conversion
* fix import newline
* Add logger to hcp client and move telemetry_config out of the client.go file
* Add a telemetry_config.go to refactor client.go
* Update deps
* update hcp deps test
* Modify telemetry_config_providers
* Check for nil filters
* PR review updates
* Fix comments and move around pieces
* Fix comments
* Remove context from client struct
* Moved ctx out of sink struct and fixed filters, added a test
* Remove named imports, use errors.New if not fformatting
* Remove HCP dependencies in telemetry package
* Add success metric and move lock only to grab the t.cfgHahs
* Update hash
* fix nits
* Create an equals method and add tests
* Improve telemetry_config_provider.go tests
* Add race test
* Add missing godoc
* Remove mock for MetricsClient
* Avoid goroutine test panics
* trying to kick CI lint issues by upgrading mod
* imprve test code and add hasher for testing
* Use structure logging for filters, fix error constants, and default to allow all regex
* removed hashin and modify logic to simplify
* Improve race test and fix PR feedback by removing hash equals and avoid testing the timer.Ticker logic, and instead unit test
* Ran make go-mod-tidy
* Use errtypes in the test
* Add changelog
* add safety check for exporter endpoint
* remove require.Contains by using error types, fix structure logging, and fix success metric typo in exporter
* Fixed race test to have changing config values
* Send success metric before modifying config
* Avoid the defer and move the success metric under
Ashvitha