Telemetry: Add environment variable to disable logs

[marcotc]

Adds the DD_TELEMETRY_LOG_COLLECTION_ENABLED environment variable to disable telemetry log collection, which is enabled by default.

Also, this PR disables telemetry logs in forked processes, to align telemetry logs with all other telemetry signals, which do not send on forks.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.56098% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.76%. Comparing base (7f079c9) to head (f7780e2).

Files with missing lines	Patch %	Lines
spec/datadog/core/telemetry/component_spec.rb	91.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4153   +/-   ##
=======================================
  Coverage   97.75%   97.76%           
=======================================
  Files        1357     1357           
  Lines       81890    81920   +30     
  Branches     4164     4164           
=======================================
+ Hits        80054    80089   +35     
+ Misses       1836     1831    -5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-12-03 19:35:08

Comparing candidate commit f7780e2 in PR branch disable-env-logs with baseline commit 7f079c9 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.

[ivoanjo]

Also, this PR disables telemetry logs in forked processes, to align telemetry logs with all other telemetry signals, which do not send on forks.

Interesting -- this was surprising to me. Is the intent here to reduce the amount of data sent?

[marcotc]

Interesting -- this was surprising to me. Is the intent here to reduce the amount of data sent?

@ivoanjo, yes. It's a cautionary setting in case log generations suddenly starts spamming logs due to unforeseen changes. This toggle was supposed to be here from the start, when we first introduced telemetry logs, in order to have a safer rollout.

[datadog-datadog-prod-us1]

Datadog Report

Branch report: disable-env-logs
Commit report: f7780e2
Test service: dd-trace-rb

✅ 0 Failed, 22044 Passed, 1458 Skipped, 5m 34.79s Total Time