Examples:
https://build.chromium.org/p/chromium.perf/builders/Win%2010%20Perf/builds/1204
https://uberchromegw.corp.google.com/i/chromium.perf/builders/Mac%20Air%2010.11%20Perf/builds/1157

Here is the benchmark code:
https://cs.chromium.org/chromium/src/tools/perf/benchmarks/system_health.py?q=system_health.py&sq=package:chromium&l=155


@benchmark.Enabled('android-webview')
@benchmark.Owner(emails=['perezju@chromium.org', 'torne@chromium.org'])
class WebviewStartupSystemHealthBenchmark(perf_benchmark.PerfBenchmark):
...

Since the benchmark looks properly restricted to webview, I think this is a telemetry issue. Ned, can you triage?