Adopt getMetrics in LowerProtocolHandler #4

Job	Run time
Static Linux Swift SDK / Construct Static SDK matrix	4s
macOS tests / Construct Darwin matrix	5s
Cxx interop / Construct Cxx interop matrix	5s
Release builds / Construct release build matrix	4s
Unit tests / Construct unit test matrix	4s
Soundness / Documentation check	39s
Soundness / License headers check	6s
Soundness / API breakage check	2m 58s
Soundness / Broken symlinks check	6s
Soundness / YAML lint check	6s
Soundness / Shell check	22s
Soundness / Format check	37s
Soundness / Unacceptable language check	5s
Soundness / Python lint check	9s
Soundness / Documentation check (macOS)	0s
Unit tests / Unit tests / Linux (nightly-next)	1m 1s
Unit tests / Unit tests / Linux (nightly-main)	3m 13s
Unit tests / Unit tests / Linux (6.3)	3m 14s
macOS tests / Swift 6.3	10m 16s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 39s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 38s
Cxx interop / Cxx interop / Linux (6.3)	3m 4s
Static Linux Swift SDK / Static SDK / Linux (main Jammy)	1m 47s
Static Linux Swift SDK / Static SDK / Linux (latest-release Jammy)	1m 38s
Release builds / Release builds / Linux (nightly-next)	4m 39s
Release builds / Release builds / Linux (6.3)	5m 11s
Release builds / Release builds / Linux (nightly-main)	5m 45s
	52m 35s

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