Dynamic meta data that won't get baked into the static html

[chris-erickson]

We put some things like the build date and git sha in the meta for diagnostics reasons, but this means every page has "updates", every time we do a build. We do it approximately like this:

<Helmet
  htmlAttributes={{
    lang,
    'data-commit': `${gitBranchName}/${gitHash}`,
    'data-build-date': `${DateTime.local()
      .setZone('America/Chicago')
      .toLocaleString(DateTime.DATETIME_HUGE_WITH_SECONDS)}`,
  }}
  title={seo.title}
  titleTemplate={titleTemplate}
  meta={_meta}
></Helmet>

Is there a recommended way to implement this client-side but with the data still being updated in a way that doesn't cause the bare HTML to have this content present? It doesn't need to end up in the header I suppose, but definitely in the meta is not optimal.