lazy load runtime metrics only when needed

[rochdev]

What does this PR do?

Lazy load runtime metrics only when needed.

Motivation

Right now when runtime metrics are disabled, the code is still loaded which impacts startup time.

[github-actions]

Overall package size

Self size: 8.76 MB
Deduped: 94.96 MB
No deduping: 95.47 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.4.0 | 29.44 MB | 29.44 MB | | @datadog/native-appsec | 8.4.0 | 19.25 MB | 19.26 MB | | @datadog/native-iast-taint-tracking | 3.3.0 | 13.77 MB | 13.78 MB | | @datadog/pprof | 5.5.1 | 9.79 MB | 10.17 MB | | protobufjs | 7.2.5 | 2.77 MB | 5.16 MB | | @datadog/native-iast-rewriter | 2.8.0 | 2.6 MB | 2.74 MB | | @opentelemetry/core | 1.14.0 | 872.87 kB | 1.47 MB | | @datadog/native-metrics | 3.1.0 | 1.06 MB | 1.46 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | import-in-the-middle | 1.11.2 | 112.74 kB | 835.4 kB | | source-map | 0.7.4 | 226 kB | 226 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | lru-cache | 7.18.3 | 133.92 kB | 133.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.0 | 109.9 kB | 109.9 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 5.3.2 | 53.63 kB | 53.63 kB | | shell-quote | 1.8.1 | 44.96 kB | 44.96 kB | | istanbul-lib-coverage | 3.2.0 | 29.34 kB | 29.34 kB | | rfdc | 1.3.1 | 25.21 kB | 25.21 kB | | @isaacs/ttlcache | 1.4.1 | 25.2 kB | 25.2 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | dc-polyfill | 0.1.4 | 23.1 kB | 23.1 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | module-details-from-path | 1.0.3 | 4.47 kB | 4.47 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.95%. Comparing base (6b97186) to head (aad7466).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5254      +/-   ##
==========================================
- Coverage   81.24%   80.95%   -0.29%     
==========================================
  Files         487      489       +2     
  Lines       21703    21826     +123     
==========================================
+ Hits        17633    17670      +37     
- Misses       4070     4156      +86     

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

[datadog-datadog-prod-us1]

Datadog Report

Branch report: lazy-runtime-metrics
Commit report: f4c2158
Test service: dd-trace-js-integration-tests

✅ 0 Failed, 669 Passed, 0 Skipped, 16m 1.34s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-18 23:23:42

Comparing candidate commit aad7466 in PR branch lazy-runtime-metrics with baseline commit 6b97186 in branch master.

Found 0 performance improvements and 7 performance regressions! Performance is the same for 895 metrics, 31 unstable metrics.

scenario:log-skip-log-18

• 🟥 cpu_user_time [+17.954ms; +22.562ms] or [+5.001%; +6.285%]
• 🟥 execution_time [+21.981ms; +24.372ms] or [+5.513%; +6.113%]

scenario:log-with-debug-18

• 🟥 execution_time [+20.806ms; +23.712ms] or [+5.235%; +5.967%]

scenario:log-with-error-18

• 🟥 cpu_user_time [+19.452ms; +24.504ms] or [+5.437%; +6.849%]
• 🟥 execution_time [+22.552ms; +24.658ms] or [+5.672%; +6.202%]

scenario:log-without-log-18

• 🟥 cpu_user_time [+19.892ms; +24.751ms] or [+5.999%; +7.464%]
• 🟥 execution_time [+23.038ms; +24.159ms] or [+6.202%; +6.504%]

[bengl]

Rather than barreling functions through like this, maybe it's better to do a prototype switch.