I know this is pretty specific, but I couldn't think of another place to ask such a work-related question.
I've been working full-time in industry for over 8 years; first half of this was as an applications developer, last 4 years have been in DevOps. I have quite a bit of hands-on experience in *nix systems, but not at a particularly granular level.
I've noticed a trend in companies that contact me, which indicates and expectation of low level understanding of these technologies (linux) for more senior positions in my field (i.e., not just how to manage linux, but how the kernel functions, how memory is managed, how inodes work, etc.).
While I'm somewhat comfortable in these areas, I'm consistently queried on aspects of them that I'm not really familiar with.
Generally, would having a tech-specific certification add confidence (for employers) in my understanding of these skills?
I know certs have recently become basically fluff, but it seems that the demand in my industry for these skills would encourage a candidate to have a verifiable credential indicating proficiency in this area. The idea here being that, while I may be asked specific questions I don't know, I can generally prove I have a good understanding of the technology overall. Am I wrong?
(bonus points: Does the RHSA even cover the kernel, or is that reserved for the RHCE?)