概述：
我们在使用gitlab-runner做cicd时，如果安装之后没有配置gitlab-runner的最大并发数，在使用时候可能会碰到job的警告（job日志超过字节限制）：job‘s log exceeded limit of 4194304 bytes *****
查看默认最大并发数concurrent=10
cat /etc/gitlab-runner/config.toml
解决办法：（/etc/gitlab-runner/config.toml 为默认安装之后没做变动的默认路径）
vim /etc/gitlab-runner/config.toml
修改第一行为concurrent配置，修改成需要的数字保存，然后
重启gitlab-runner服务生效
gitlab-runner restart
问题解决，告警消失
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