Removed duplicated metrics (#8116)

* Removed duplicated metrics

* Add new metric

* Add metadata.csv

* Fix metadata

* Update postgres/datadog_checks/postgres/util.py

Co-authored-by: Andrew Zhang <31313038+yzhan289@users.noreply.github.com>

Co-authored-by: Andrew Zhang <31313038+yzhan289@users.noreply.github.com>

Author: FlorianVeaux

postgres/datadog_checks/postgres/util.py

@@ -132,12 +132,10 @@ def build_relations_filter(relations_config, schema_field):
 
 REL_METRICS = {
     'descriptors': [('relname', 'table'), ('schemaname', 'schema')],
-    # This field contains old metrics that need to be deprecated. For now we keep sending them.
-    'deprecated_metrics': {'idx_tup_fetch': ('postgresql.index_rows_fetched', AgentCheck.rate)},
     'metrics': {
         'seq_scan': ('postgresql.seq_scans', AgentCheck.rate),
         'seq_tup_read': ('postgresql.seq_rows_read', AgentCheck.rate),
-        'idx_scan': ('postgresql.index_scans', AgentCheck.rate),
+        'idx_scan': ('postgresql.index_rel_scans', AgentCheck.rate),
         'idx_tup_fetch': ('postgresql.index_rel_rows_fetched', AgentCheck.rate),
         'n_tup_ins': ('postgresql.rows_inserted', AgentCheck.rate),
         'n_tup_upd': ('postgresql.rows_updated', AgentCheck.rate),

postgres/metadata.csv

@@ -26,7 +26,8 @@ postgresql.bgwriter.sync_time,count,,millisecond,,The total amount of checkpoint
 postgresql.locks,gauge,,lock,,The number of locks active for this database.,0,postgres,locks
 postgresql.seq_scans,gauge,,,,The number of sequential scans initiated on this table.,0,postgres,seq scans
 postgresql.seq_rows_read,gauge,,row,second,The number of live rows fetched by sequential scans.,0,postgres,seq rows rd
-postgresql.index_scans,gauge,,,,The number of index scans initiated on this table.,0,postgres,idx scans
+postgresql.index_scans,gauge,,,,"The number of index scans initiated on this table, tagged by index.",0,postgres,idx scans
+postgresql.index_rel_scans,gauge,,,,The overall number of index scans initiated on this table.,0,postgres,idx scans
 postgresql.index_rows_fetched,gauge,,row,second,The number of live rows fetched by index scans.,0,postgres,idx rows fetch
 postgresql.index_rel_rows_fetched,gauge,,row,second,The number of live rows fetched by index scans.,0,postgres,idx rows fetch
 postgresql.rows_hot_updated,gauge,,row,second,"The number of rows HOT updated, meaning no separate index update was needed.",0,postgres,rows hot updated