[Synthetics] Increase project API payload limit (#142140) (#142597)

(cherry picked from commit 6824718c0a)

Co-authored-by: Shahzad <shahzad.muhammad@elastic.co>

src/plugins/bfetch/server/plugin.ts

@@ -20,6 +20,7 @@ import {
 } from '@kbn/core/server';
 import { schema } from '@kbn/config-schema';
 import { map$ } from '@kbn/std';
+import { RouteConfigOptions } from '@kbn/core-http-server';
 import {
   StreamingResponseHandler,
   BatchRequestData,
@@ -54,7 +55,8 @@ export interface BfetchServerSetup {
       context: RequestHandlerContext
     ) => StreamingResponseHandler<Payload, Response>,
     method?: 'GET' | 'POST' | 'PUT' | 'DELETE',
-    pluginRouter?: ReturnType<CoreSetup['http']['createRouter']>
+    pluginRouter?: ReturnType<CoreSetup['http']['createRouter']>,
+    options?: RouteConfigOptions<'get' | 'post' | 'put' | 'delete'>
   ) => void;
 }
 
@@ -117,14 +119,16 @@ export class BfetchServerPlugin
       router: ReturnType<CoreSetup['http']['createRouter']>;
       logger: Logger;
     }): BfetchServerSetup['addStreamingResponseRoute'] =>
-    (path, handler, method = 'POST', pluginRouter) => {
+    (path, handler, method = 'POST', pluginRouter, options) => {
       const httpRouter = pluginRouter || router;
+
       const routeDefinition = {
         path: `/${removeLeadingSlash(path)}`,
         validate: {
           body: schema.any(),
           query: schema.object({ compress: schema.boolean({ defaultValue: false }) }),
         },
+        options,
       };
       const routeHandler: RequestHandler<unknown, Query> = async (
         context: RequestHandlerContext,

x-pack/plugins/synthetics/server/routes/monitor_cruds/add_monitor_project.ts

@@ -13,6 +13,8 @@ import { API_URLS } from '../../../common/constants';
 import { getAllLocations } from '../../synthetics_service/get_all_locations';
 import { ProjectMonitorFormatter } from '../../synthetics_service/project_monitor/project_monitor_formatter';
 
+const MAX_PAYLOAD_SIZE = 1048576 * 20; // 20MiB
+
 export const addSyntheticsProjectMonitorRoute: SyntheticsStreamingRouteFactory = (
   libs: UMServerLibs
 ) => ({
@@ -25,6 +27,11 @@ export const addSyntheticsProjectMonitorRoute: SyntheticsStreamingRouteFactory =
       monitors: schema.arrayOf(schema.any()),
     }),
   },
+  options: {
+    body: {
+      maxBytes: MAX_PAYLOAD_SIZE,
+    },
+  },
   handler: async ({
     request,
     savedObjectsClient,

x-pack/plugins/synthetics/server/server.ts

@@ -57,7 +57,7 @@ export const initSyntheticsServer = (
   });
 
   syntheticsAppStreamingApiRoutes.forEach((route) => {
-    const { method, streamHandler, path } = syntheticsRouteWrapper(
+    const { method, streamHandler, path, options } = syntheticsRouteWrapper(
       createSyntheticsRouteWithAuth(libs, route),
       server,
       syntheticsMonitorClient
@@ -82,7 +82,8 @@ export const initSyntheticsServer = (
         };
       },
       method,
-      server.router
+      server.router,
+      options
     );
   });
 };

x-pack/plugins/synthetics/server/synthetics_route_wrapper.ts

@@ -19,6 +19,7 @@ export const syntheticsRouteWrapper: SyntheticsRouteWrapper = (
   ...uptimeRoute,
   options: {
     tags: ['access:uptime-read', ...(uptimeRoute?.writeAccess ? ['access:uptime-write'] : [])],
+    ...(uptimeRoute.options ?? {}),
   },
   streamHandler: async (context, request, subject) => {
     const coreContext = await context.core;