[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 31% 🎉

Details

File	Before	After	Percent reduction
/doc/images/spring-metrice02.png	85.07kb	53.69kb	36.88%
/doc/images/spring-metrice03.png	326.42kb	212.78kb	34.81%
/doc/images/spring-metrice01.png	559.92kb	390.70kb	30.22%
/doc/images/spring-metrice04.png	475.94kb	337.73kb	29.04%
Total :	1,447.34kb	994.91kb	31.26%

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