Earlier this year, I wrote a post where I collected resources on the subject of Site Reliability Engineering (SRE). Here is an updated list of podcast episodes.
This is a german podcast, but the episode on SRE is in english.
The New Stack Makers has a piece on the The evolution of the Site Reliability Engineer.
The Cloud Cast actually has quite a few good episodes that touch the topic.
Last, but certainly not least the Kubernetes Podcast from Google has an episode entitlled: SRE, with Tina Zhang and Fred van den Driessche