EventManager: add uid and extension placeholders #1929

Job	Run time
Build Linux packages (amd64, ubuntu:18.04, latest, amd64)	2m 55s
Build Linux packages (amd64, ubuntu:18.04, latest, amd64)	2m 55s
Test build flags	1m 47s
Test build flags	1m 47s
Build Linux packages (aarch64, ubuntu18.04, latest, arm64)	15m 53s
Build Linux packages (aarch64, ubuntu18.04, latest, arm64)	15m 53s
Build Linux packages (ppc64le, ubuntu18.04, latest, ppc64le)	14m 55s
Build Linux packages (ppc64le, ubuntu18.04, latest, ppc64le)	14m 55s
Build Linux packages (armv7, ubuntu18.04, latest, arm7)	17m 21s
Build Linux packages (armv7, ubuntu18.04, latest, arm7)	17m 21s
Test and deploy (1.21, ubuntu-latest, true)	12m 33s
Test and deploy (1.21, ubuntu-latest, true)	12m 49s
Test and deploy (1.21, macos-latest, true)	12m 13s
Test and deploy (1.21, macos-latest, true)	24m 40s
Test with PgSQL/MySQL/Cockroach	19m 41s
Test with PgSQL/MySQL/Cockroach	19m 41s
Test and deploy (1.21, windows-latest, false)	12m 16s
Test and deploy (1.21, windows-latest, false)	23m 27s
golangci-lint	1m 32s
golangci-lint	1m 32s
	4h 6m 6s

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