pgstat: rename some pgstat_send_* functions to pgstat_report_*.

Only the pgstat_send_* functions that are called from outside pgstat*.c are
renamed (the rest will go away). This is done separately from the - quite
large - shared memory statistics patch to make review easier.

Author: Andres Freund <andres@anarazel.de>
Reviewed-By: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/20220404041516.cctrvpadhuriawlq@alap3.anarazel.de

src/backend/postmaster/bgwriter.c

@@ -241,7 +241,7 @@ BackgroundWriterMain(void)
 		can_hibernate = BgBufferSync(&wb_context);
 
 		/* Report pending statistics to the cumulative stats system */
-		pgstat_send_bgwriter();
+		pgstat_report_bgwriter();
 
 		if (FirstCallSinceLastCheckpoint())
 		{

src/backend/postmaster/checkpointer.c

@@ -493,8 +493,8 @@ CheckpointerMain(void)
 		CheckArchiveTimeout();
 
 		/* Report pending statistics to the cumulative stats system */
-		pgstat_send_checkpointer();
-		pgstat_send_wal(true);
+		pgstat_report_checkpointer();
+		pgstat_report_wal(true);
 
 		/*
 		 * If any checkpoint flags have been set, redo the loop to handle the
@@ -571,8 +571,8 @@ HandleCheckpointerInterrupts(void)
 		 */
 		PendingCheckpointerStats.m_requested_checkpoints++;
 		ShutdownXLOG(0, 0);
-		pgstat_send_checkpointer();
-		pgstat_send_wal(true);
+		pgstat_report_checkpointer();
+		pgstat_report_wal(true);
 
 		/* Normal exit from the checkpointer is here */
 		proc_exit(0);			/* done */
@@ -715,7 +715,7 @@ CheckpointWriteDelay(int flags, double progress)
 		CheckArchiveTimeout();
 
 		/* Report interim statistics to the cumulative stats system */
-		pgstat_send_checkpointer();
+		pgstat_report_checkpointer();
 
 		/*
 		 * This sleep used to be connected to bgwriter_delay, typically 200ms.

src/backend/postmaster/pgarch.c

@@ -480,7 +480,7 @@ pgarch_ArchiverCopyLoop(void)
 				 * Tell the cumulative stats system about the WAL file that we
 				 * successfully archived
 				 */
-				pgstat_send_archiver(xlog, false);
+				pgstat_report_archiver(xlog, false);
 
 				break;			/* out of inner retry loop */
 			}
@@ -490,7 +490,7 @@ pgarch_ArchiverCopyLoop(void)
 				 * Tell the cumulative stats system about the WAL file that we
 				 * failed to archive
 				 */
-				pgstat_send_archiver(xlog, true);
+				pgstat_report_archiver(xlog, true);
 
 				if (++failures >= NUM_ARCHIVE_RETRIES)
 				{

src/backend/postmaster/pgstat.c

@@ -793,7 +793,7 @@ pgstat_report_stat(bool disconnect)
 	pgstat_send_funcstats();
 
 	/* Send WAL statistics */
-	pgstat_send_wal(true);
+	pgstat_report_wal(true);
 
 	/* Finally send SLRU statistics */
 	pgstat_send_slru();

src/backend/postmaster/walwriter.c

@@ -258,7 +258,7 @@ WalWriterMain(void)
 			left_till_hibernate--;
 
 		/* report pending statistics to the cumulative stats system */
-		pgstat_send_wal(false);
+		pgstat_report_wal(false);
 
 		/*
 		 * Sleep until we are signaled or WalWriterDelay has elapsed.  If we
@@ -297,11 +297,11 @@ HandleWalWriterInterrupts(void)
 		/*
 		 * Force reporting remaining WAL statistics at process exit.
 		 *
-		 * Since pgstat_send_wal is invoked with 'force' is false in main loop
+		 * Since pgstat_report_wal is invoked with 'force' is false in main loop
 		 * to avoid overloading the cumulative stats system, there may exist
 		 * unreported stats counters for the WAL writer.
 		 */
-		pgstat_send_wal(true);
+		pgstat_report_wal(true);
 
 		proc_exit(0);
 	}

src/backend/utils/activity/pgstat_archiver.c

@@ -25,7 +25,7 @@
  * Report archiver statistics
  */
 void
-pgstat_send_archiver(const char *xlog, bool failed)
+pgstat_report_archiver(const char *xlog, bool failed)
 {
 	PgStat_MsgArchiver msg;
 

src/backend/utils/activity/pgstat_bgwriter.c

@@ -32,7 +32,7 @@ PgStat_MsgBgWriter PendingBgWriterStats;
  * Report bgwriter statistics
  */
 void
-pgstat_send_bgwriter(void)
+pgstat_report_bgwriter(void)
 {
 	/* We assume this initializes to zeroes */
 	static const PgStat_MsgBgWriter all_zeroes;

src/backend/utils/activity/pgstat_checkpointer.c

@@ -32,7 +32,7 @@ PgStat_MsgCheckpointer PendingCheckpointerStats;
  * Report checkpointer statistics
  */
 void
-pgstat_send_checkpointer(void)
+pgstat_report_checkpointer(void)
 {
 	/* We assume this initializes to zeroes */
 	static const PgStat_MsgCheckpointer all_zeroes;

src/backend/utils/activity/pgstat_wal.c

@@ -31,8 +31,8 @@ PgStat_MsgWal WalStats;
 
 /*
  * WAL usage counters saved from pgWALUsage at the previous call to
- * pgstat_send_wal(). This is used to calculate how much WAL usage
- * happens between pgstat_send_wal() calls, by subtracting
+ * pgstat_report_wal(). This is used to calculate how much WAL usage
+ * happens between pgstat_report_wal() calls, by subtracting
  * the previous counters from the current ones.
  */
 static WalUsage prevWalUsage;
@@ -45,7 +45,7 @@ static WalUsage prevWalUsage;
  * passed since last one was sent to reach PGSTAT_STAT_INTERVAL.
  */
 void
-pgstat_send_wal(bool force)
+pgstat_report_wal(bool force)
 {
 	static TimestampTz sendTime = 0;
 
@@ -133,7 +133,7 @@ void
 pgstat_wal_initialize(void)
 {
 	/*
-	 * Initialize prevWalUsage with pgWalUsage so that pgstat_send_wal() can
+	 * Initialize prevWalUsage with pgWalUsage so that pgstat_report_wal() can
 	 * calculate how much pgWalUsage counters are increased by subtracting
 	 * prevWalUsage from pgWalUsage.
 	 */

src/include/pgstat.h

@@ -997,21 +997,21 @@ extern PgStat_WalStats *pgstat_fetch_stat_wal(void);
  * Functions in pgstat_archiver.c
  */
 
-extern void pgstat_send_archiver(const char *xlog, bool failed);
+extern void pgstat_report_archiver(const char *xlog, bool failed);
 
 
 /*
  * Functions in pgstat_bgwriter.c
  */
 
-extern void pgstat_send_bgwriter(void);
+extern void pgstat_report_bgwriter(void);
 
 
 /*
  * Functions in pgstat_checkpointer.c
  */
 
-extern void pgstat_send_checkpointer(void);
+extern void pgstat_report_checkpointer(void);
 
 
 /*
@@ -1165,7 +1165,7 @@ extern void PostPrepare_PgStat(void);
  * Functions in pgstat_wal.c
  */
 
-extern void pgstat_send_wal(bool force);
+extern void pgstat_report_wal(bool force);
 
 
 /*