[receiver/chrony] generated lifecycle tests (open-telemetry#31524)

**Description:**
Add generated tests for chrony receiver; move initialization of the
chrony client to the start function

**Link to tracking Issue:**
Relates to open-telemetry#27849

Author: atoulme

.chloggen/chronyreceiver_lifecycle.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: chronyreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: move initialization of the chrony client to the start function
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [27849]
+
+# (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: []

receiver/chronyreceiver/factory.go

@@ -34,13 +34,15 @@ func newMetricsReceiver(
 		return nil, fmt.Errorf("wrong config provided: %w", errInvalidValue)
 	}
 
-	chronyc, err := chrony.New(cfg.Endpoint, cfg.Timeout)
-	if err != nil {
-		return nil, err
-	}
+	s := newScraper(ctx, cfg, set)
 	scraper, err := scraperhelper.NewScraper(
 		metadata.Type.String(),
-		newScraper(ctx, chronyc, cfg, set).scrape,
+		s.scrape,
+		scraperhelper.WithStart(func(ctx context.Context, host component.Host) error {
+			chronyc, err := chrony.New(cfg.Endpoint, cfg.Timeout)
+			s.client = chronyc
+			return err
+		}),
 	)
 	if err != nil {
 		return nil, err

receiver/chronyreceiver/generated_component_test.go

@@ -74,3 +74,7 @@ metrics:
       value_type: double
     attributes:
     - leap.status
+
+tests:
+  config:
+  skip_lifecycle: true

receiver/chronyreceiver/metadata.yaml

@@ -20,9 +20,8 @@ type chronyScraper struct {
 	mb     *metadata.MetricsBuilder
 }
 
-func newScraper(ctx context.Context, client chrony.Client, cfg *Config, set receiver.CreateSettings) *chronyScraper {
+func newScraper(ctx context.Context, cfg *Config, set receiver.CreateSettings) *chronyScraper {
 	return &chronyScraper{
-		client: client,
 		mb: metadata.NewMetricsBuilder(cfg.MetricsBuilderConfig, set,
 			metadata.WithStartTime(pcommon.NewTimestampFromTime(clock.FromContext(ctx).Now())),
 		),

receiver/chronyreceiver/scraper.go

@@ -115,7 +115,8 @@ func TestChronyScraper(t *testing.T) {
 			chronym.On("GetTrackingData").Return(tc.mockTracking, tc.mockErr)
 
 			ctx := clock.Context(context.Background(), clck)
-			scraper := newScraper(ctx, chronym, tc.conf, receivertest.NewNopCreateSettings())
+			scraper := newScraper(ctx, tc.conf, receivertest.NewNopCreateSettings())
+			scraper.client = chronym
 
 			metrics, err := scraper.scrape(ctx)