receiver/postgresql - Fixing the field name client_addr in query_sample collection (#42446)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
In the field mapping of query_sample attributes in client.go, we are
currently mapping `currentAttributes["network.peer.address"] =
row["client_addrs"], and in this line client_addrs is misspelled. Actual
field name in pg_stat_activity table is client_addr.

<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes
#42447

<!--Describe what testing was performed and which tests were added.-->
#### Testing

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#### Documentation

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---------

Co-authored-by: Curtis Robert <[email protected]>

Author: sv-splunk

.chloggen/pg-client_addr-fix.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: postgresqlreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Properly set `network.peer.address` attribute
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [42447]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

receiver/postgresqlreceiver/client.go

@@ -945,7 +945,7 @@ func (c *postgreSQLClient) getQuerySamples(ctx context.Context, limit int64, new
 		}
 		currentAttributes[dbPrefix+"pid"] = pid
 		currentAttributes["network.peer.port"] = clientPort
-		currentAttributes["network.peer.address"] = row["client_addrs"]
+		currentAttributes["network.peer.address"] = row["client_addr"]
 		currentAttributes["db.query.text"] = obfuscated
 		currentAttributes["db.namespace"] = row["datname"]
 		currentAttributes["user.name"] = row["usename"]

receiver/postgresqlreceiver/scraper_test.go

@@ -426,7 +426,7 @@ func TestScrapeQuerySample(t *testing.T) {
 	scraper := newPostgreSQLScraper(settings, cfg, factory, newCache(1), newTTLCache[string](1, time.Second))
 	scraper.newestQueryTimestamp = 123440.111
 	mock.ExpectQuery(expectedScrapeSampleQuery).WillReturnRows(sqlmock.NewRows(
-		[]string{"datname", "usename", "client_addrs", "client_hostname", "client_port", "query_start", "wait_event_type", "wait_event", "query_id", "pid", "application_name", "_query_start_timestamp", "state", "query", "duration_ms"},
+		[]string{"datname", "usename", "client_addr", "client_hostname", "client_port", "query_start", "wait_event_type", "wait_event", "query_id", "pid", "application_name", "_query_start_timestamp", "state", "query", "duration_ms"},
 	).FromCSVString("postgres,otelu,11.4.5.14,otel,114514,2025-02-12T16:37:54.843+08:00,,,123131231231,1450,receiver,123445.123,idle,select * from pg_stat_activity where id = 32,1.2"))
 	actualLogs, err := scraper.scrapeQuerySamples(t.Context(), 30)
 	assert.NoError(t, err)

receiver/postgresqlreceiver/testdata/scraper/query-sample/expected.yaml

@@ -50,7 +50,7 @@ resourceLogs:
                   doubleValue: 1.2
             body: {}
             eventName: db.server.query_sample
-            timeUnixNano: "1755817062035258000"
+            timeUnixNano: "1758612388939691000"
         scope:
           name: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/postgresqlreceiver
           version: latest