*** a/src/backend/commands/vacuumlazy.c
--- b/src/backend/commands/vacuumlazy.c
***************
*** 288,294 **** lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
  	/* report results to the stats collector, too */
  	pgstat_report_vacuum(RelationGetRelid(onerel),
  						 onerel->rd_rel->relisshared,
! 						 new_rel_tuples);
  
  	/* and log the action if appropriate */
  	if (IsAutoVacuumWorkerProcess() && Log_autovacuum_min_duration >= 0)
--- 288,295 ----
  	/* report results to the stats collector, too */
  	pgstat_report_vacuum(RelationGetRelid(onerel),
  						 onerel->rd_rel->relisshared,
! 						 new_rel_tuples,
! 						 vacrelstats->tuples_deleted);
  
  	/* and log the action if appropriate */
  	if (IsAutoVacuumWorkerProcess() && Log_autovacuum_min_duration >= 0)
*** a/src/backend/postmaster/pgstat.c
--- b/src/backend/postmaster/pgstat.c
***************
*** 1317,1323 **** pgstat_report_autovac(Oid dboid)
   * ---------
   */
  void
! pgstat_report_vacuum(Oid tableoid, bool shared, PgStat_Counter tuples)
  {
  	PgStat_MsgVacuum msg;
  
--- 1317,1324 ----
   * ---------
   */
  void
! pgstat_report_vacuum(Oid tableoid, bool shared, PgStat_Counter tuples,
! 					 PgStat_Counter tuples_removed)
  {
  	PgStat_MsgVacuum msg;
  
***************
*** 1330,1335 **** pgstat_report_vacuum(Oid tableoid, bool shared, PgStat_Counter tuples)
--- 1331,1337 ----
  	msg.m_autovacuum = IsAutoVacuumWorkerProcess();
  	msg.m_vacuumtime = GetCurrentTimestamp();
  	msg.m_tuples = tuples;
+ 	msg.m_tuples_removed = tuples_removed;
  	pgstat_send(&msg, sizeof(msg));
  }
  
***************
*** 4800,4807 **** pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len)
  	tabentry = pgstat_get_tab_entry(dbentry, msg->m_tableoid, true);
  
  	tabentry->n_live_tuples = msg->m_tuples;
! 	/* Resetting dead_tuples to 0 is an approximation ... */
! 	tabentry->n_dead_tuples = 0;
  
  	if (msg->m_autovacuum)
  	{
--- 4802,4814 ----
  	tabentry = pgstat_get_tab_entry(dbentry, msg->m_tableoid, true);
  
  	tabentry->n_live_tuples = msg->m_tuples;
! 
! 	/*
! 	 * clearing out the number of tuples removed by the vacuum from total dead
! 	 * tuples of the table.
! 	 */
! 	tabentry->n_dead_tuples -= msg->m_tuples_removed;
! 	tabentry->n_dead_tuples = Max(tabentry->n_dead_tuples, 0);
  
  	if (msg->m_autovacuum)
  	{
*** a/src/include/pgstat.h
--- b/src/include/pgstat.h
***************
*** 332,337 **** typedef struct PgStat_MsgVacuum
--- 332,338 ----
  	bool		m_autovacuum;
  	TimestampTz m_vacuumtime;
  	PgStat_Counter m_tuples;
+ 	PgStat_Counter m_tuples_removed;
  } PgStat_MsgVacuum;
  
  
***************
*** 773,779 **** extern void pgstat_reset_single_counter(Oid objectid, PgStat_Single_Reset_Type t
  
  extern void pgstat_report_autovac(Oid dboid);
  extern void pgstat_report_vacuum(Oid tableoid, bool shared,
! 					 PgStat_Counter tuples);
  extern void pgstat_report_analyze(Relation rel,
  					  PgStat_Counter livetuples, PgStat_Counter deadtuples);
  
--- 774,780 ----
  
  extern void pgstat_report_autovac(Oid dboid);
  extern void pgstat_report_vacuum(Oid tableoid, bool shared,
! 					 PgStat_Counter tuples, PgStat_Counter tuples_removed);
  extern void pgstat_report_analyze(Relation rel,
  					  PgStat_Counter livetuples, PgStat_Counter deadtuples);