diff --git a/internal/collector/linux_memory_test.go b/internal/collector/linux_memory_test.go
index fe89241..db85cb1 100644
--- a/internal/collector/linux_memory_test.go
+++ b/internal/collector/linux_memory_test.go
@@ -1,6 +1,7 @@
 package collector
 
 import (
+	"fmt"
 	"github.com/stretchr/testify/assert"
 	"os"
 	"path/filepath"
@@ -8,6 +9,14 @@ import (
 )
 
 func TestMeminfoCollector_Update(t *testing.T) {
+	meminfo, err := os.ReadFile("/proc/meminfo")
+	assert.NoError(t, err)
+	fmt.Println(string(meminfo))
+
+	vmstat, err := os.ReadFile("/proc/vmstat")
+	assert.NoError(t, err)
+	fmt.Println(string(vmstat))
+
 	var input = pipelineInput{
 		required: []string{
 			"node_memory_MemTotal", "node_memory_MemFree", "node_memory_MemAvailable", "node_memory_MemUsed",
@@ -32,6 +41,7 @@ func TestMeminfoCollector_Update(t *testing.T) {
 			"node_memory_WritebackTmp", "node_memory_NFS_Unstable", "node_memory_DirectMap2M", "node_memory_Hugetlb",
 			"node_memory_CmaTotal", "node_memory_Mlocked", "node_memory_ShmemPmdMapped", "node_memory_SUnreclaim",
 			"node_memory_KernelStack", "node_memory_VmallocChunk", "node_memory_Percpu", "node_memory_HardwareCorrupted",
+			"node_memory_CmaFree", "node_memory_CmaTotal",
 			// vmstat
 			"node_vmstat_nr_free_pages", "node_vmstat_nr_zone_inactive_anon", "node_vmstat_nr_zone_active_anon",
 			"node_vmstat_nr_zone_inactive_file", "node_vmstat_nr_zone_active_file", "node_vmstat_nr_zone_unevictable",
@@ -83,7 +93,8 @@ func TestMeminfoCollector_Update(t *testing.T) {
 			"node_vmstat_pgsteal_anon", "node_vmstat_pgsteal_file", "node_vmstat_pgscan_file", "node_vmstat_pgscan_anon",
 			"node_vmstat_thp_file_fallback_charge", "node_vmstat_nr_foll_pin_released", "node_vmstat_thp_file_fallback",
 			"node_vmstat_thp_fault_fallback_charge", "node_vmstat_nr_swapcached", "node_vmstat_direct_map_level2_splits",
-			"node_vmstat_direct_map_level3_splits",
+			"node_vmstat_direct_map_level3_splits", "node_vmstat_workingset_refault", "node_vmstat_workingset_activate",
+			"node_vmstat_workingset_restore", "node_vmstat_pgdemote_kswapd", "node_vmstat_pgdemote_direct",
 		},
 		collector: NewMeminfoCollector,
 	}
diff --git a/internal/collector/postgres_database.go b/internal/collector/postgres_database.go
index 76794e4..21a4270 100644
--- a/internal/collector/postgres_database.go
+++ b/internal/collector/postgres_database.go
@@ -46,7 +46,11 @@ type postgresDatabasesCollector struct {
 	commits            typedDesc
 	rollbacks          typedDesc
 	blocks             typedDesc
-	tuples             typedDesc
+	tuplesReturned     typedDesc
+	tuplesFetched      typedDesc
+	tuplesInserted     typedDesc
+	tuplesUpdated      typedDesc
+	tuplesDeleted      typedDesc
 	tempbytes          typedDesc
 	tempfiles          typedDesc
 	conflicts          typedDesc
@@ -89,10 +93,34 @@ func NewPostgresDatabasesCollector(constLabels labels, settings model.CollectorS
 			[]string{"database", "access"}, constLabels,
 			settings.Filters,
 		),
-		tuples: newBuiltinTypedDesc(
-			descOpts{"postgres", "database", "tuples_total", "Total number of rows processed by each type of operation.", 0},
+		tuplesReturned: newBuiltinTypedDesc(
+			descOpts{"postgres", "database", "tuples_returned_total", "Total number of rows returned per each database.", 0},
 			prometheus.CounterValue,
-			[]string{"database", "tuples"}, constLabels,
+			[]string{"database"}, constLabels,
+			settings.Filters,
+		),
+		tuplesFetched: newBuiltinTypedDesc(
+			descOpts{"postgres", "database", "tuples_fetched_total", "Total number of rows fetched per each database.", 0},
+			prometheus.CounterValue,
+			[]string{"database"}, constLabels,
+			settings.Filters,
+		),
+		tuplesInserted: newBuiltinTypedDesc(
+			descOpts{"postgres", "database", "tuples_inserted_total", "Total number of rows inserted per each database.", 0},
+			prometheus.CounterValue,
+			[]string{"database"}, constLabels,
+			settings.Filters,
+		),
+		tuplesUpdated: newBuiltinTypedDesc(
+			descOpts{"postgres", "database", "tuples_updated_total", "Total number of rows updated per each database.", 0},
+			prometheus.CounterValue,
+			[]string{"database"}, constLabels,
+			settings.Filters,
+		),
+		tuplesDeleted: newBuiltinTypedDesc(
+			descOpts{"postgres", "database", "tuples_deleted_total", "Total number of rows deleted per each database.", 0},
+			prometheus.CounterValue,
+			[]string{"database"}, constLabels,
 			settings.Filters,
 		),
 		tempbytes: newBuiltinTypedDesc(
@@ -209,11 +237,11 @@ func (c *postgresDatabasesCollector) Update(config Config, ch chan<- prometheus.
 		ch <- c.rollbacks.newConstMetric(stat.xactrollback, stat.database)
 		ch <- c.blocks.newConstMetric(stat.blksread, stat.database, "read")
 		ch <- c.blocks.newConstMetric(stat.blkshit, stat.database, "hit")
-		ch <- c.tuples.newConstMetric(stat.tupreturned, stat.database, "returned")
-		ch <- c.tuples.newConstMetric(stat.tupfetched, stat.database, "fetched")
-		ch <- c.tuples.newConstMetric(stat.tupinserted, stat.database, "inserted")
-		ch <- c.tuples.newConstMetric(stat.tupupdated, stat.database, "updated")
-		ch <- c.tuples.newConstMetric(stat.tupdeleted, stat.database, "deleted")
+		ch <- c.tuplesReturned.newConstMetric(stat.tupreturned, stat.database)
+		ch <- c.tuplesFetched.newConstMetric(stat.tupfetched, stat.database)
+		ch <- c.tuplesInserted.newConstMetric(stat.tupinserted, stat.database)
+		ch <- c.tuplesUpdated.newConstMetric(stat.tupupdated, stat.database)
+		ch <- c.tuplesDeleted.newConstMetric(stat.tupdeleted, stat.database)
 
 		ch <- c.tempbytes.newConstMetric(stat.tempbytes, stat.database)
 		ch <- c.tempfiles.newConstMetric(stat.tempfiles, stat.database)
diff --git a/internal/collector/postgres_database_test.go b/internal/collector/postgres_database_test.go
index e08973f..0927fb2 100644
--- a/internal/collector/postgres_database_test.go
+++ b/internal/collector/postgres_database_test.go
@@ -14,7 +14,11 @@ func TestPostgresDatabasesCollector_Update(t *testing.T) {
 			"postgres_database_xact_commits_total",
 			"postgres_database_xact_rollbacks_total",
 			"postgres_database_blocks_total",
-			"postgres_database_tuples_total",
+			"postgres_database_tuples_returned_total",
+			"postgres_database_tuples_fetched_total",
+			"postgres_database_tuples_inserted_total",
+			"postgres_database_tuples_updated_total",
+			"postgres_database_tuples_deleted_total",
 			"postgres_database_temp_bytes_total",
 			"postgres_database_temp_files_total",
 			"postgres_database_conflicts_total",
@@ -25,10 +29,6 @@ func TestPostgresDatabasesCollector_Update(t *testing.T) {
 			"postgres_database_size_bytes",
 			"postgres_database_stats_age_seconds_total",
 			"postgres_xacts_left_before_wraparound",
-		},
-		// TODO: wait until Postgres 14 has been released, update Postgres version on pgscv-testing docker image
-		//   and move these metrics to 'required' slice.
-		optional: []string{
 			"postgres_database_session_time_seconds_all_total",
 			"postgres_database_session_time_seconds_total",
 			"postgres_database_sessions_all_total",