api: Add reporting fields to activitylog config endpoint (#20086)

This PR adds the internal reporting state to the
`internal/counters/config` read endpoint:
* reporting_enabled
* billing_start_timestamp

changelog/20086.txt

@@ -0,0 +1,4 @@
+```release-note:improvement
+api: `/sys/internal/counters/config` endpoint now contains read-only
+`reporting_enabled` and `billing_start_timestamp` fields.
+```

vault/activity_log_test.go

@@ -838,6 +838,8 @@ func TestActivityLog_API_ConfigCRUD(t *testing.T) {
 			"retention_months":        24,
 			"enabled":                 activityLogEnabledDefaultValue,
 			"queries_available":       false,
+			"reporting_enabled":       core.censusLicensingEnabled,
+			"billing_start_timestamp": core.GetBillingStart(),
 		}
 
 		if diff := deep.Equal(resp.Data, defaults); len(diff) > 0 {
@@ -919,6 +921,8 @@ func TestActivityLog_API_ConfigCRUD(t *testing.T) {
 			"retention_months":        2,
 			"enabled":                 "enable",
 			"queries_available":       false,
+			"reporting_enabled":       false,
+			"billing_start_timestamp": core.GetBillingStart(),
 		}
 
 		if diff := deep.Equal(resp.Data, expected); len(diff) > 0 {
@@ -955,6 +959,8 @@ func TestActivityLog_API_ConfigCRUD(t *testing.T) {
 			"retention_months":        24,
 			"enabled":                 activityLogEnabledDefaultValue,
 			"queries_available":       false,
+			"reporting_enabled":       false,
+			"billing_start_timestamp": core.GetBillingStart(),
 		}
 
 		if diff := deep.Equal(resp.Data, defaults); len(diff) > 0 {

vault/census.go

@@ -2,5 +2,9 @@
 
 package vault
 
+import "time"
+
 // CensusAgent is a stub for OSS
-type CensusAgent struct{}
+type CensusAgent struct {
+	billingStart time.Time
+}

vault/core.go

@@ -4015,3 +4015,14 @@ func (c *Core) GetRaftAutopilotState(ctx context.Context) (*raft.AutopilotState,
 func (c *Core) Events() *eventbus.EventBus {
 	return c.events
 }
+
+// GetBillingStart gets the billing start timestamp from the configured Census
+// Agent, handling a nil agent.
+func (c *Core) GetBillingStart() time.Time {
+	var billingStart time.Time
+	if c.censusAgent != nil {
+		billingStart = c.censusAgent.billingStart
+	}
+
+	return billingStart
+}

vault/logical_system_activity.go

@@ -271,6 +271,8 @@ func (b *SystemBackend) handleActivityConfigRead(ctx context.Context, req *logic
 			"retention_months":        config.RetentionMonths,
 			"enabled":                 config.Enabled,
 			"queries_available":       qa,
+			"reporting_enabled":       b.Core.censusLicensingEnabled,
+			"billing_start_timestamp": b.Core.GetBillingStart(),
 		},
 	}, nil
 }

website/content/api-docs/system/internal-counters.mdx

@@ -924,7 +924,9 @@ $ curl \
     "default_report_months": 12,
     "enabled": "default-enabled",
     "queries_available": true,
-    "retention_months": 24
+    "retention_months": 24,
+    "reporting_enabled": false,
+    "billing_start_timestamp": "2022-03-01T00:00:00Z",
   },
   "warnings": null
 }