// during initial snapshot creation, it will insert every snapshotted pod's IP into the set.
//
// The set does not allow dupes (obviously, that would be undefined) - but in the real world due to misconfigured
// IPAM or other things, we may see two pods with the same IP on the same node - we will skip the dupes,
// which is all we can do - these pods will fail healthcheck until the IPAM issue is resolved (which seems reasonable)

          //
          // addListener has thrown an exception! SetFuture.run can't throw any exceptions so this
          // must have been caused by addListener itself. The most likely explanation is a
          // misconfigured mock. Try to switch to Failure.
          Failure failure;
          try {
            failure = new Failure(t);
          } catch (Exception | Error oomMostLikely) { // sneaky checked exception

          //
          // addListener has thrown an exception! SetFuture.run can't throw any exceptions so this
          // must have been caused by addListener itself. The most likely explanation is a
          // misconfigured mock. Try to switch to Failure.
          Failure failure;
          try {
            failure = new Failure(t);
          } catch (Exception | Error oomMostLikely) { // sneaky checked exception