I can recommend:

https://blog.bytebytego.com/

https://bigtechdigest.substack.com/

https://www.oreilly.com/emails/newsletters/

https://ardalis.com/tips

https://www.oreilly.com/emails/newsletters/ , has various topics to read from.

http://kube.news

http://www.oreilly.com/webops-perf/newsletter.html

https://www.hashicorp.com/blog/

https://aws.amazon.com/blogs/aws/

https://cloudplatform.googleblog.com

https://azure.microsoft.com/en-us/blog/

https://twitter.com/SREcon

https://usenix.org

LISA conferences

Not a blog, https://cloudacademy.com

O'Reilly has a weekly Fintech newsletter which is pretty interesting. It isn't weekly like most of O'Reilly's newsletters, but that can be a good thing as it doesn't have to stretch to find interesting articles.

http://www.oreilly.com/fintech/newsletter.html

Subscribe to Data Science Weekly: http://www.datascienceweekly.org/

http://blog.zipfianacademy.com/

http://blog.cloudera.com/blog/category/data-science/

http://www.hilarymason.com/

http://mathbabe.org/

http://fivethirtyeight.blogs.nytimes.com/

http://blog.kaggle.com/

http://grepalex.com/

http://pulseblog.emc.com/category/big-data/

http://radar.oreilly.com/

http://flowingdata.com/

http://oreilly.com/data/newsletter.html

http://www.gapminder.org/

http://mlcomp.org/