[filelogreceiver] fix: update logpath regex to include rotated files in container parser (#38440)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
Extends log file path pattern in container parser to include rotated log
files which are currently being rejected, leading to dropped logs.

<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes
#35137

<!--Describe what testing was performed and which tests were added.-->
#### Testing
Added two test cases to include rotated file log path examples.

Author: alexylew

.chloggen/alew_fix-container-parser-logfilepath-pattern.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: filelogreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Extend container parser log file path pattern to include rotated files."
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [35137]
+
+# (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]

pkg/stanza/operator/parser/container/parser.go

@@ -30,7 +30,7 @@ const (
 	dockerPattern       = "^\\{"
 	crioPattern         = "^(?P<time>[^ Z]+) (?P<stream>stdout|stderr) (?P<logtag>[^ ]*) ?(?P<log>.*)$"
 	containerdPattern   = "^(?P<time>[^ ^Z]+Z) (?P<stream>stdout|stderr) (?P<logtag>[^ ]*) ?(?P<log>.*)$"
-	logpathPattern      = "^.*(\\/|\\\\)(?P<namespace>[^_]+)_(?P<pod_name>[^_]+)_(?P<uid>[a-f0-9\\-]+)(\\/|\\\\)(?P<container_name>[^\\._]+)(\\/|\\\\)(?P<restart_count>\\d+)\\.log$"
+	logpathPattern      = "^.*(\\/|\\\\)(?P<namespace>[^_]+)_(?P<pod_name>[^_]+)_(?P<uid>[a-f0-9\\-]+)(\\/|\\\\)(?P<container_name>[^\\._]+)(\\/|\\\\)(?P<restart_count>\\d+)\\.log(\\.\\d{8}-\\d{6})?$"
 	logPathField        = attrs.LogFilePath
 	crioTimeLayout      = "2006-01-02T15:04:05.999999999Z07:00"
 	goTimeLayout        = "2006-01-02T15:04:05.999Z"

pkg/stanza/operator/parser/container/parser_test.go

@@ -222,6 +222,41 @@ func TestRecombineProcess(t *testing.T) {
 				},
 			},
 		},
+		{
+			"crio_standalone_with_auto_detection_and_metadata_from_rotated_file_path",
+			func() (operator.Operator, error) {
+				cfg := NewConfigWithID("test_id")
+				cfg.AddMetadataFromFilePath = true
+				set := componenttest.NewNopTelemetrySettings()
+				return cfg.Build(set)
+			},
+			[]*entry.Entry{
+				{
+					Body: `2024-04-13T07:59:37.505201169-10:00 stdout F standalone crio line which is awesome!`,
+					Attributes: map[string]any{
+						attrs.LogFilePath: "/var/log/pods/some_kube-scheduler-kind-control-plane_49cc7c1fd3702c40b2686ea7486091d3/kube-scheduler44/1.log.20250219-233547",
+					},
+				},
+			},
+			[]*entry.Entry{
+				{
+					Attributes: map[string]any{
+						"log.iostream":    "stdout",
+						"logtag":          "F",
+						attrs.LogFilePath: "/var/log/pods/some_kube-scheduler-kind-control-plane_49cc7c1fd3702c40b2686ea7486091d3/kube-scheduler44/1.log.20250219-233547",
+					},
+					Body: "standalone crio line which is awesome!",
+					Resource: map[string]any{
+						"k8s.pod.name":                "kube-scheduler-kind-control-plane",
+						"k8s.pod.uid":                 "49cc7c1fd3702c40b2686ea7486091d3",
+						"k8s.container.name":          "kube-scheduler44",
+						"k8s.container.restart_count": "1",
+						"k8s.namespace.name":          "some",
+					},
+					Timestamp: time.Date(2024, time.April, 13, 7, 59, 37, 505201169, time.FixedZone("", -10*60*60)),
+				},
+			},
+		},
 		{
 			"containerd_standalone_with_auto_detection_and_metadata_from_file_path",
 			func() (operator.Operator, error) {
@@ -257,6 +292,41 @@ func TestRecombineProcess(t *testing.T) {
 				},
 			},
 		},
+		{
+			"containerd_standalone_with_auto_detection_and_metadata_from_rotated_file_path",
+			func() (operator.Operator, error) {
+				cfg := NewConfigWithID("test_id")
+				cfg.AddMetadataFromFilePath = true
+				set := componenttest.NewNopTelemetrySettings()
+				return cfg.Build(set)
+			},
+			[]*entry.Entry{
+				{
+					Body: `2024-04-13T07:59:37.505201169Z stdout F standalone containerd line which is awesome!`,
+					Attributes: map[string]any{
+						attrs.LogFilePath: "/var/log/pods/some_kube-scheduler-kind-control-plane_49cc7c1fd3702c40b2686ea7486091d3/kube-scheduler44/1.log.20250219-233547",
+					},
+				},
+			},
+			[]*entry.Entry{
+				{
+					Attributes: map[string]any{
+						"log.iostream":    "stdout",
+						"logtag":          "F",
+						attrs.LogFilePath: "/var/log/pods/some_kube-scheduler-kind-control-plane_49cc7c1fd3702c40b2686ea7486091d3/kube-scheduler44/1.log.20250219-233547",
+					},
+					Resource: map[string]any{
+						"k8s.pod.name":                "kube-scheduler-kind-control-plane",
+						"k8s.pod.uid":                 "49cc7c1fd3702c40b2686ea7486091d3",
+						"k8s.container.name":          "kube-scheduler44",
+						"k8s.container.restart_count": "1",
+						"k8s.namespace.name":          "some",
+					},
+					Body:      "standalone containerd line which is awesome!",
+					Timestamp: time.Date(2024, time.April, 13, 7, 59, 37, 505201169, time.UTC),
+				},
+			},
+		},
 		{
 			"crio_multiple_with_auto_detection_and_metadata_from_file_path",
 			func() (operator.Operator, error) {