Add revision version to app logs

config/cloud_controller.yml

@@ -390,3 +390,5 @@ custom_metric_tag_prefix_list: ["metric.tag.cloudfoundry.org"]
 
 max_manifest_service_binding_poll_duration_in_seconds: 60
 update_metric_tags_on_rename: true
+
+app_log_revision: true

lib/cloud_controller/config_schemas/vms/api_schema.rb

@@ -38,7 +38,9 @@ class ApiSchema < VCAP::Config
               docker_staging_stack: String,
               optional(:temporary_oci_buildpack_mode) => enum('oci-phase-1', NilClass),
               enable_declarative_asset_downloads: bool
-            }
+            },
+
+            app_log_revision: bool
           }
         end
 

lib/cloud_controller/config_schemas/vms/clock_schema.rb

@@ -35,7 +35,9 @@ class ClockSchema < VCAP::Config
               use_privileged_containers_for_staging: bool,
               optional(:temporary_oci_buildpack_mode) => enum('oci-phase-1', NilClass),
               enable_declarative_asset_downloads: bool
-            }
+            },
+
+            app_log_revision: bool
           }
         end
 

lib/cloud_controller/config_schemas/vms/deployment_updater_schema.rb

@@ -35,7 +35,9 @@ class DeploymentUpdaterSchema < VCAP::Config
               use_privileged_containers_for_staging: bool,
               optional(:temporary_oci_buildpack_mode) => enum('oci-phase-1', NilClass),
               enable_declarative_asset_downloads: bool
-            }
+            },
+
+            app_log_revision: bool
           }
         end
 

lib/cloud_controller/config_schemas/vms/worker_schema.rb

@@ -35,7 +35,9 @@ class WorkerSchema < VCAP::Config
               use_privileged_containers_for_staging: bool,
               optional(:temporary_oci_buildpack_mode) => enum('oci-phase-1', NilClass),
               enable_declarative_asset_downloads: bool
-            }
+            },
+
+            app_log_revision: bool
           }
         end
 

lib/cloud_controller/diego/main_lrp_action_builder.rb

@@ -60,11 +60,19 @@ def generate_app_action(start_command, user, environment_variables)
                  path: '/tmp/lifecycle/launcher',
                  args: launcher_args,
                  env: environment_variables,
-                 log_source: "APP/PROC/#{process.type.upcase}",
+                 log_source: app_log_source,
                  resource_limits: ::Diego::Bbs::Models::ResourceLimits.new(nofile: process.file_descriptors)
                ))
       end
 
+      def app_log_source
+        if VCAP::CloudController::Config.config.get(:app_log_revision) && process.revision
+          "APP/REV/#{process.revision.version}/PROC/#{process.type.upcase}"
+        else
+          "APP/PROC/#{process.type.upcase}"
+        end
+      end
+
       def allow_ssh?
         process.enable_ssh
       end

spec/unit/lib/cloud_controller/diego/main_lrp_action_builder_spec.rb

@@ -103,6 +103,58 @@ module Diego
             each { |env_vars| expect(env_vars).not_to include(an_object_satisfying { |var| var.name == 'VCAP_PLATFORM_OPTIONS' }) }
         end
 
+        fcontext 'revisions' do
+          let(:revision) { RevisionModel.make(app: app_model, version: 99) }
+
+          before do
+            process.revision = revision
+          end
+
+          context 'when the app_log_revision config is enabled' do
+            before do
+              TestConfig.config[:app_log_revision] = true
+            end
+
+            it 'shows the revision id in the log source' do
+              action = MainLRPActionBuilder.build(process, lrp_builder, ssh_key)
+              expect(action.codependent_action.actions.first.run_action.log_source).to eq("APP/REV/99/PROC/WEB")
+            end
+
+            context 'and the revision is not present' do
+              before do
+                process.update(revision: nil)
+              end
+
+              it 'does not show revision in the log source' do
+                action = MainLRPActionBuilder.build(process, lrp_builder, ssh_key)
+                expect(action.codependent_action.actions.first.run_action.log_source).to eq("APP/PROC/WEB")
+              end
+            end
+
+            context 'and when the app feature revisions is disabled' do
+              before do
+                app_model.update(revisions_enabled: false)
+              end
+
+              it 'still shows existing revisions in the log source' do
+                action = MainLRPActionBuilder.build(process, lrp_builder, ssh_key)
+                expect(action.codependent_action.actions.first.run_action.log_source).to eq("APP/REV/99/PROC/WEB")
+              end
+            end
+          end
+
+          context 'when the app_log_revision config is disabled' do
+            before do
+              TestConfig.config[:app_log_revision] = false
+            end
+
+            it 'does not show the revision in the log source' do
+              action = MainLRPActionBuilder.build(process, lrp_builder, ssh_key)
+              expect(action.codependent_action.actions.first.run_action.log_source).to eq("APP/PROC/WEB")
+            end
+          end
+        end
+
         context 'sidecars' do
           let(:sidecar_action_environment_variables) do
             [::Diego::Bbs::Models::EnvironmentVariable.new(name: 'PORT', value: '4444'),