misc

perf: use fmt.Fprintf to avoid unnecessary string+args + WriteString … #10993

Job	Run time
Run misc suite (autocounterd) / Go Build / generated	10s
Run misc suite (autocounterd) / Go Test / test	41s
Run misc suite (autocounterd) / Go Lint / lint	38s
Run misc suite (genproto) / Go Build / generated	11s
Run misc suite (genproto) / Go Lint / lint	39s
Run misc suite (genproto) / Go Test / test	44s
Run misc suite (genstd) / Go Build / generated	8s
Run misc suite (genstd) / Go Lint / lint	25s
Run misc suite (genstd) / Go Test / test	23s
Run misc suite (goscan) / Go Build / generated	6s
Run misc suite (goscan) / Go Lint / lint	17s
Run misc suite (goscan) / Go Test / test	20s
Run misc suite (loop) / Go Lint / lint	36s
Run misc suite (loop) / Go Test / test	43s
Run misc suite (loop) / Go Build / generated	7s
	6m 8s

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