Revert "Revert "Update links""

This reverts commit 0d0a6fa8d4c4089c263786bab746b14ef03cfac6.
Revert "Update links"

This reverts commit d5c3074ee8d284b8191a188bb4149a4728d67c63.
Revert "Added kairosdb, a rewrite of OpenTSDB."

This reverts commit baac8e8028368ba05be000d2e948088c8ab59a9a.