Browser Agent v1216 Release Notes

This adds release notes for v1216 of the Browser Agent

src/content/docs/release-notes/new-relic-browser-release-notes/browser-agent-release-notes/browser-agent-v1216.mdx

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+---
+subject: Browser agent
+releaseDate: '2022-04-20'
+version: '1216'
+---
+
+* Internal NR Platform release date: 04/19/2022
+* Production APM-injected release date: 04/20/2022
+* Production Standalone release date: 04/27/2022
+
+## New Features
+
+### Introduced obfuscation mechanism to payloads
+
+Added internal mechanism for applying regex and replacement rules to all strings in payloads to obfuscate before sending to ingest.
+
+### Automatically obfuscate `file://` protocol
+
+A change has been implemented in our handling of applications hosted locally on a `file://` protocol. For security reasons, we can not send payloads that contain file information, so our previous implementation revolved around completely shutting the agent down when `file://` protocols were detected. This change automatically obfuscates all `file://` paths from our payloads before sending to ingest.
+
+## Bug Fixes
+
+### Fixed issue with trace ID random hex character length
+
+The final character in trace ID hex generation was returning as `undefined`, which translated to always be `0` (`undefined & 15 === 0`).  This change fixes this final character and ensures it is valid.