Thank you, I will take a look more deeply as soon as possible.

@sdurrheimer this isn't directly related to this PR but the CI failed because OSXCROSS_SDK_URL isn't set (https://circleci.com/gh/prometheus/golang-builder/165). This relates probably to the migration from Circle CI 1.0 to 2.0 and the fact that by default, builds from forked pull requests can't access secrets (see https://circleci.com/docs/2.0/oss/#pass-secrets-to-builds-from-forked-pull-requests). I've pushed my branch to the parent repository and it solves the issue for me but any external contributor will be impacted AFAICT.

LGTM but usually we only keep 2 golang versions. We should probably remove Go 1.9.

I thought that node_exporter was still using 1.9 but it isn't the case anymore since a month ago. I'll amend the PR to keep only 1.10 and 1.11.

Yes, we think we may have gotten to the bottom of the 1.10.x CGO crashing. At worst, we've disabled the collector that appears to be the problem.