Error in Geo on PostgreSQL 10.2 with a "function pg_last_xlog_receive_location() does not exist" and replication slots

Running Geo on PostgreSQL 10.2, we get the following in the Geo Node Status

Could not connect to Geo node - HTTP Status Code: 500 Internal Server Error 500 Internal Server Error

that leads to the following error in the console:

17:46:09 postgresql.1            | 2018-02-19 17:46:09.886 CET [33996] ERROR:  function pg_last_xlog_receive_location() does not exist at character 46
17:46:09 postgresql.1            | 2018-02-19 17:46:09.886 CET [33996] HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
17:46:09 postgresql.1            | 2018-02-19 17:46:09.886 CET [33996] STATEMENT:
17:46:09 postgresql.1            | 	          SELECT CASE
17:46:09 postgresql.1            | 	                 WHEN pg_last_xlog_receive_location() = pg_last_xlog_replay_location()
17:46:09 postgresql.1            | 	                  THEN 0
17:46:09 postgresql.1            | 	                 ELSE
17:46:09 postgresql.1            | 	                  EXTRACT (EPOCH FROM now() - pg_last_xact_replay_timestamp())::INTEGER
17:46:09 postgresql.1            | 	                 END
17:46:09 postgresql.1            | 	                 AS replication_lag

Looks like the function pg_last_xlog_receive_location() no longer exists in 10.2 (or earlier? it's available in 9.6...).

There is also an issue with pg_current_xlog_insert_location() on the primary:

18:00:10 postgresql.1            | 2018-02-19 18:00:10.471 CET [35034] ERROR:  function pg_current_xlog_insert_location() does not exist at character 43
18:00:10 postgresql.1            | 2018-02-19 18:00:10.471 CET [35034] HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
18:00:10 postgresql.1            | 2018-02-19 18:00:10.471 CET [35034] STATEMENT:  SELECT COALESCE(MAX(pg_xlog_location_diff(pg_current_xlog_insert_location(), restart_lsn)), 0)

We need to review all replication slot functions for 10.2...