Add prometheus label whitelisting #1981
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Prometheus best practices state
Do not use labels to store dimensions with high cardinality (many different label values), such as user IDs, email addresses, or other unbounded sets of values.. We should encourage users to follow this by allowing label whitelisting. This is initially only for prometheus, but flags are intentionally non-specific to allow for other storage plugins to make use of this as well. The default behavior is unchanged, as--enforce_storage_label_whitelistis disabled by default.This PR adds two new flags:
enforce_storage_label_whitelist, which turns on the whitelisting, andlabel_whitelist, which is the set of labels allowed.Related: #1730
The daemonset (#1979) makes use of these flags so prometheus-to-sd doesn't exceed its label limit.