trace propagation

[djskinner]

Goal

Set traceparent header on intercepted network requests

Design

• Use existing request-tracker interface into the fetch/xhr monkey patches

Changeset

• Update request trackers to handle any extraRequestHeaders supplied by handlers
• Expand NetworkRequestPlugin to determine whether to set and value for traceparent
• traceparent request header will be added to all same-origin xhr/fetch requests by default
• networkRequestCallback behaviour changes:
  • returning null will neither create a span nor add traceparent headers
  • returning { url: null } will disable creating a network span
  • returning { propagateTraceContext: boolean } will override the default trace propagation behaviour.

Testing

• [x] unit test coverage
• [x] e2e test coverage
• [x] alpha release for manual testing against the dashboard

[github-actions[bot]]

Browser bundle size

NPM build

	Package
Before	180.09 kB
After	183.51 kB
±	+3,421 bytes ⚠️

CDN build

	Unminified	Minfied	Minified + gzipped
Before	87.01 kB	32.72 kB	10.01 kB
After	91.29 kB	34.23 kB	10.38 kB
±	+4,279 bytes ⚠️	+1,509 bytes ⚠️	+370 bytes ⚠️

Code coverage

Ok	File (✨=New File)	Lines	Branches	Functions	Statements
✅	/home/runner/work/bugsnag-js-performance/bugsnag-js-performance/packages/core/lib/span-factory.ts	100% (+0%)	96.66% (+0%)	100% (+0%)	98.59% (+0.02%)
🔴	/home/runner/work/bugsnag-js-performance/bugsnag-js-performance/packages/platforms/browser/lib/id-generator.ts	88.88% (-11.12%)	0% (-100%)	100% (+0%)	88.88% (-11.12%)
🔴	/home/runner/work/bugsnag-js-performance/bugsnag-js-performance/packages/platforms/browser/lib/auto-instrumentation/network-request-plugin.ts	94.33% (+0.79%)	83.33% (+11.91%)	100% (+0%)	94.54% (+3.37%)
🔴	/home/runner/work/bugsnag-js-performance/bugsnag-js-performance/packages/request-tracker/lib/request-tracker-fetch.ts	84.84% (+4.84%)	57.57% (+7.57%)	70% (-5%)	69.76% (-3.57%)
🔴	/home/runner/work/bugsnag-js-performance/bugsnag-js-performance/packages/request-tracker/lib/request-tracker-xhr.ts	74.35% (-4.43%)	54.54% (+7.49%)	80% (+0%)	57.62% (-2.79%)
🔴	/home/runner/work/bugsnag-js-performance/bugsnag-js-performance/packages/request-tracker/lib/request-tracker.ts	95.45% (-4.55%)	100% (+0%)	100% (+0%)	96.66% (-3.34%)

Total:

Lines	Branches	Functions	Statements
91.25%(+3.64%)	81.26%(+2.71%)	92.58%(+4.24%)	88.49%(+3.97%)

Generated against 165ca01a592e0f6ba3b63d5e4ccd35ba121d0dd8 on 25 March 2024 at 10:27:32 UTC