1syntax = "proto3";
2
3package envoy.config.bootstrap.v4alpha;
4
5import "envoy/config/cluster/v4alpha/cluster.proto";
6import "envoy/config/core/v4alpha/address.proto";
7import "envoy/config/core/v4alpha/base.proto";
8import "envoy/config/core/v4alpha/config_source.proto";
9import "envoy/config/core/v4alpha/event_service_config.proto";
10import "envoy/config/core/v4alpha/extension.proto";
11import "envoy/config/core/v4alpha/socket_option.proto";
12import "envoy/config/listener/v4alpha/listener.proto";
13import "envoy/config/metrics/v4alpha/stats.proto";
14import "envoy/config/overload/v3/overload.proto";
15import "envoy/extensions/transport_sockets/tls/v4alpha/secret.proto";
16import "envoy/type/v3/percent.proto";
17
18import "google/protobuf/duration.proto";
19import "google/protobuf/struct.proto";
20import "google/protobuf/wrappers.proto";
21
22import "envoy/annotations/deprecation.proto";
23import "udpa/annotations/security.proto";
24import "udpa/annotations/status.proto";
25import "udpa/annotations/versioning.proto";
26import "validate/validate.proto";
27
28option java_package = "io.envoyproxy.envoy.config.bootstrap.v4alpha";
29option java_outer_classname = "BootstrapProto";
30option java_multiple_files = true;
31option (udpa.annotations.file_status).package_version_status = NEXT_MAJOR_VERSION_CANDIDATE;
32
33// [#protodoc-title: Bootstrap]
34// This proto is supplied via the :option:`-c` CLI flag and acts as the root
35// of the Envoy v2 configuration. See the :ref:`v2 configuration overview
36// <config_overview_bootstrap>` for more detail.
37
38// Bootstrap :ref:`configuration overview <config_overview_bootstrap>`.
39// [#next-free-field: 30]
40message Bootstrap {
41 option (udpa.annotations.versioning).previous_message_type =
42 "envoy.config.bootstrap.v3.Bootstrap";
43
44 message StaticResources {
45 option (udpa.annotations.versioning).previous_message_type =
46 "envoy.config.bootstrap.v3.Bootstrap.StaticResources";
47
48 // Static :ref:`Listeners <envoy_api_msg_config.listener.v4alpha.Listener>`. These listeners are
49 // available regardless of LDS configuration.
50 repeated listener.v4alpha.Listener listeners = 1;
51
52 // If a network based configuration source is specified for :ref:`cds_config
53 // <envoy_api_field_config.bootstrap.v4alpha.Bootstrap.DynamicResources.cds_config>`, it's necessary
54 // to have some initial cluster definitions available to allow Envoy to know
55 // how to speak to the management server. These cluster definitions may not
56 // use :ref:`EDS <arch_overview_dynamic_config_eds>` (i.e. they should be static
57 // IP or DNS-based).
58 repeated cluster.v4alpha.Cluster clusters = 2;
59
60 // These static secrets can be used by :ref:`SdsSecretConfig
61 // <envoy_api_msg_extensions.transport_sockets.tls.v4alpha.SdsSecretConfig>`
62 repeated envoy.extensions.transport_sockets.tls.v4alpha.Secret secrets = 3;
63 }
64
65 // [#next-free-field: 7]
66 message DynamicResources {
67 option (udpa.annotations.versioning).previous_message_type =
68 "envoy.config.bootstrap.v3.Bootstrap.DynamicResources";
69
70 reserved 4;
71
72 // All :ref:`Listeners <envoy_api_msg_config.listener.v4alpha.Listener>` are provided by a single
73 // :ref:`LDS <arch_overview_dynamic_config_lds>` configuration source.
74 core.v4alpha.ConfigSource lds_config = 1;
75
76 // xdstp:// resource locator for listener collection.
77 // [#not-implemented-hide:]
78 string lds_resources_locator = 5;
79
80 // All post-bootstrap :ref:`Cluster <envoy_api_msg_config.cluster.v4alpha.Cluster>` definitions are
81 // provided by a single :ref:`CDS <arch_overview_dynamic_config_cds>`
82 // configuration source.
83 core.v4alpha.ConfigSource cds_config = 2;
84
85 // xdstp:// resource locator for cluster collection.
86 // [#not-implemented-hide:]
87 string cds_resources_locator = 6;
88
89 // A single :ref:`ADS <config_overview_ads>` source may be optionally
90 // specified. This must have :ref:`api_type
91 // <envoy_api_field_config.core.v4alpha.ApiConfigSource.api_type>` :ref:`GRPC
92 // <envoy_api_enum_value_config.core.v4alpha.ApiConfigSource.ApiType.GRPC>`. Only
93 // :ref:`ConfigSources <envoy_api_msg_config.core.v4alpha.ConfigSource>` that have
94 // the :ref:`ads <envoy_api_field_config.core.v4alpha.ConfigSource.ads>` field set will be
95 // streamed on the ADS channel.
96 core.v4alpha.ApiConfigSource ads_config = 3;
97 }
98
99 reserved 10, 11, 8, 9;
100
101 reserved "runtime", "watchdog", "tracing";
102
103 // Node identity to present to the management server and for instance
104 // identification purposes (e.g. in generated headers).
105 core.v4alpha.Node node = 1;
106
107 // A list of :ref:`Node <envoy_v3_api_msg_config.core.v3.Node>` field names
108 // that will be included in the context parameters of the effective
109 // xdstp:// URL that is sent in a discovery request when resource
110 // locators are used for LDS/CDS. Any non-string field will have its JSON
111 // encoding set as the context parameter value, with the exception of
112 // metadata, which will be flattened (see example below). The supported field
113 // names are:
114 // - "cluster"
115 // - "id"
116 // - "locality.region"
117 // - "locality.sub_zone"
118 // - "locality.zone"
119 // - "metadata"
120 // - "user_agent_build_version.metadata"
121 // - "user_agent_build_version.version"
122 // - "user_agent_name"
123 // - "user_agent_version"
124 //
125 // The node context parameters act as a base layer dictionary for the context
126 // parameters (i.e. more specific resource specific context parameters will
127 // override). Field names will be prefixed with “udpa.node.” when included in
128 // context parameters.
129 //
130 // For example, if node_context_params is ``["user_agent_name", "metadata"]``,
131 // the implied context parameters might be::
132 //
133 // node.user_agent_name: "envoy"
134 // node.metadata.foo: "{\"bar\": \"baz\"}"
135 // node.metadata.some: "42"
136 // node.metadata.thing: "\"thing\""
137 //
138 // [#not-implemented-hide:]
139 repeated string node_context_params = 26;
140
141 // Statically specified resources.
142 StaticResources static_resources = 2;
143
144 // xDS configuration sources.
145 DynamicResources dynamic_resources = 3;
146
147 // Configuration for the cluster manager which owns all upstream clusters
148 // within the server.
149 ClusterManager cluster_manager = 4;
150
151 // Health discovery service config option.
152 // (:ref:`core.ApiConfigSource <envoy_api_msg_config.core.v4alpha.ApiConfigSource>`)
153 core.v4alpha.ApiConfigSource hds_config = 14;
154
155 // Optional file system path to search for startup flag files.
156 string flags_path = 5;
157
158 // Optional set of stats sinks.
159 repeated metrics.v4alpha.StatsSink stats_sinks = 6;
160
161 // Configuration for internal processing of stats.
162 metrics.v4alpha.StatsConfig stats_config = 13;
163
164 oneof stats_flush {
165 // Optional duration between flushes to configured stats sinks. For
166 // performance reasons Envoy latches counters and only flushes counters and
167 // gauges at a periodic interval. If not specified the default is 5000ms (5
168 // seconds). Only one of `stats_flush_interval` or `stats_flush_on_admin`
169 // can be set.
170 // Duration must be at least 1ms and at most 5 min.
171 google.protobuf.Duration stats_flush_interval = 7 [(validate.rules).duration = {
172 lt {seconds: 300}
173 gte {nanos: 1000000}
174 }];
175
176 // Flush stats to sinks only when queried for on the admin interface. If set,
177 // a flush timer is not created. Only one of `stats_flush_on_admin` or
178 // `stats_flush_interval` can be set.
179 bool stats_flush_on_admin = 29 [(validate.rules).bool = {const: true}];
180 }
181
182 // Optional watchdogs configuration.
183 // This is used for specifying different watchdogs for the different subsystems.
184 Watchdogs watchdogs = 27;
185
186 // Configuration for the runtime configuration provider. If not
187 // specified, a “null” provider will be used which will result in all defaults
188 // being used.
189 LayeredRuntime layered_runtime = 17;
190
191 // Configuration for the local administration HTTP server.
192 Admin admin = 12;
193
194 // Optional overload manager configuration.
195 overload.v3.OverloadManager overload_manager = 15 [
196 (udpa.annotations.security).configure_for_untrusted_downstream = true,
197 (udpa.annotations.security).configure_for_untrusted_upstream = true
198 ];
199
200 // Enable :ref:`stats for event dispatcher <operations_performance>`, defaults to false.
201 // Note that this records a value for each iteration of the event loop on every thread. This
202 // should normally be minimal overhead, but when using
203 // :ref:`statsd <envoy_api_msg_config.metrics.v4alpha.StatsdSink>`, it will send each observed value
204 // over the wire individually because the statsd protocol doesn't have any way to represent a
205 // histogram summary. Be aware that this can be a very large volume of data.
206 bool enable_dispatcher_stats = 16;
207
208 // Optional string which will be used in lieu of x-envoy in prefixing headers.
209 //
210 // For example, if this string is present and set to X-Foo, then x-envoy-retry-on will be
211 // transformed into x-foo-retry-on etc.
212 //
213 // Note this applies to the headers Envoy will generate, the headers Envoy will sanitize, and the
214 // headers Envoy will trust for core code and core extensions only. Be VERY careful making
215 // changes to this string, especially in multi-layer Envoy deployments or deployments using
216 // extensions which are not upstream.
217 string header_prefix = 18;
218
219 // Optional proxy version which will be used to set the value of :ref:`server.version statistic
220 // <server_statistics>` if specified. Envoy will not process this value, it will be sent as is to
221 // :ref:`stats sinks <envoy_api_msg_config.metrics.v4alpha.StatsSink>`.
222 google.protobuf.UInt64Value stats_server_version_override = 19;
223
224 // Always use TCP queries instead of UDP queries for DNS lookups.
225 // This may be overridden on a per-cluster basis in cds_config,
226 // when :ref:`dns_resolvers <envoy_api_field_config.cluster.v4alpha.Cluster.dns_resolvers>` and
227 // :ref:`use_tcp_for_dns_lookups <envoy_api_field_config.cluster.v4alpha.Cluster.use_tcp_for_dns_lookups>` are
228 // specified.
229 // Setting this value causes failure if the
230 // ``envoy.restart_features.use_apple_api_for_dns_lookups`` runtime value is true during
231 // server startup. Apple' API only uses UDP for DNS resolution.
232 bool use_tcp_for_dns_lookups = 20;
233
234 // Specifies optional bootstrap extensions to be instantiated at startup time.
235 // Each item contains extension specific configuration.
236 repeated core.v4alpha.TypedExtensionConfig bootstrap_extensions = 21;
237
238 // Specifies optional extensions instantiated at startup time and
239 // invoked during crash time on the request that caused the crash.
240 repeated FatalAction fatal_actions = 28;
241
242 // Configuration sources that will participate in
243 // xdstp:// URL authority resolution. The algorithm is as
244 // follows:
245 // 1. The authority field is taken from the xdstp:// URL, call
246 // this *resource_authority*.
247 // 2. *resource_authority* is compared against the authorities in any peer
248 // *ConfigSource*. The peer *ConfigSource* is the configuration source
249 // message which would have been used unconditionally for resolution
250 // with opaque resource names. If there is a match with an authority, the
251 // peer *ConfigSource* message is used.
252 // 3. *resource_authority* is compared sequentially with the authorities in
253 // each configuration source in *config_sources*. The first *ConfigSource*
254 // to match wins.
255 // 4. As a fallback, if no configuration source matches, then
256 // *default_config_source* is used.
257 // 5. If *default_config_source* is not specified, resolution fails.
258 // [#not-implemented-hide:]
259 repeated core.v4alpha.ConfigSource config_sources = 22;
260
261 // Default configuration source for xdstp:// URLs if all
262 // other resolution fails.
263 // [#not-implemented-hide:]
264 core.v4alpha.ConfigSource default_config_source = 23;
265
266 // Optional overriding of default socket interface. The value must be the name of one of the
267 // socket interface factories initialized through a bootstrap extension
268 string default_socket_interface = 24;
269
270 // Global map of CertificateProvider instances. These instances are referred to by name in the
271 // :ref:`CommonTlsContext.CertificateProviderInstance.instance_name
272 // <envoy_api_field_extensions.transport_sockets.tls.v4alpha.CommonTlsContext.CertificateProviderInstance.instance_name>`
273 // field.
274 // [#not-implemented-hide:]
275 map<string, core.v4alpha.TypedExtensionConfig> certificate_provider_instances = 25;
276}
277
278// Administration interface :ref:`operations documentation
279// <operations_admin_interface>`.
280message Admin {
281 option (udpa.annotations.versioning).previous_message_type = "envoy.config.bootstrap.v3.Admin";
282
283 // The path to write the access log for the administration server. If no
284 // access log is desired specify ‘/dev/null’. This is only required if
285 // :ref:`address <envoy_api_field_config.bootstrap.v4alpha.Admin.address>` is set.
286 string access_log_path = 1;
287
288 // The cpu profiler output path for the administration server. If no profile
289 // path is specified, the default is ‘/var/log/envoy/envoy.prof’.
290 string profile_path = 2;
291
292 // The TCP address that the administration server will listen on.
293 // If not specified, Envoy will not start an administration server.
294 core.v4alpha.Address address = 3;
295
296 // Additional socket options that may not be present in Envoy source code or
297 // precompiled binaries.
298 repeated core.v4alpha.SocketOption socket_options = 4;
299}
300
301// Cluster manager :ref:`architecture overview <arch_overview_cluster_manager>`.
302message ClusterManager {
303 option (udpa.annotations.versioning).previous_message_type =
304 "envoy.config.bootstrap.v3.ClusterManager";
305
306 message OutlierDetection {
307 option (udpa.annotations.versioning).previous_message_type =
308 "envoy.config.bootstrap.v3.ClusterManager.OutlierDetection";
309
310 // Specifies the path to the outlier event log.
311 string event_log_path = 1;
312
313 // [#not-implemented-hide:]
314 // The gRPC service for the outlier detection event service.
315 // If empty, outlier detection events won't be sent to a remote endpoint.
316 core.v4alpha.EventServiceConfig event_service = 2;
317 }
318
319 // Name of the local cluster (i.e., the cluster that owns the Envoy running
320 // this configuration). In order to enable :ref:`zone aware routing
321 // <arch_overview_load_balancing_zone_aware_routing>` this option must be set.
322 // If *local_cluster_name* is defined then :ref:`clusters
323 // <envoy_api_msg_config.cluster.v4alpha.Cluster>` must be defined in the :ref:`Bootstrap
324 // static cluster resources
325 // <envoy_api_field_config.bootstrap.v4alpha.Bootstrap.StaticResources.clusters>`. This is unrelated to
326 // the :option:`--service-cluster` option which does not `affect zone aware
327 // routing <https://github.com/envoyproxy/envoy/issues/774>`_.
328 string local_cluster_name = 1;
329
330 // Optional global configuration for outlier detection.
331 OutlierDetection outlier_detection = 2;
332
333 // Optional configuration used to bind newly established upstream connections.
334 // This may be overridden on a per-cluster basis by upstream_bind_config in the cds_config.
335 core.v4alpha.BindConfig upstream_bind_config = 3;
336
337 // A management server endpoint to stream load stats to via
338 // *StreamLoadStats*. This must have :ref:`api_type
339 // <envoy_api_field_config.core.v4alpha.ApiConfigSource.api_type>` :ref:`GRPC
340 // <envoy_api_enum_value_config.core.v4alpha.ApiConfigSource.ApiType.GRPC>`.
341 core.v4alpha.ApiConfigSource load_stats_config = 4;
342}
343
344// Allows you to specify different watchdog configs for different subsystems.
345// This allows finer tuned policies for the watchdog. If a subsystem is omitted
346// the default values for that system will be used.
347message Watchdogs {
348 option (udpa.annotations.versioning).previous_message_type =
349 "envoy.config.bootstrap.v3.Watchdogs";
350
351 // Watchdog for the main thread.
352 Watchdog main_thread_watchdog = 1;
353
354 // Watchdog for the worker threads.
355 Watchdog worker_watchdog = 2;
356}
357
358// Envoy process watchdog configuration. When configured, this monitors for
359// nonresponsive threads and kills the process after the configured thresholds.
360// See the :ref:`watchdog documentation <operations_performance_watchdog>` for more information.
361// [#next-free-field: 8]
362message Watchdog {
363 option (udpa.annotations.versioning).previous_message_type = "envoy.config.bootstrap.v3.Watchdog";
364
365 message WatchdogAction {
366 option (udpa.annotations.versioning).previous_message_type =
367 "envoy.config.bootstrap.v3.Watchdog.WatchdogAction";
368
369 // The events are fired in this order: KILL, MULTIKILL, MEGAMISS, MISS.
370 // Within an event type, actions execute in the order they are configured.
371 // For KILL/MULTIKILL there is a default PANIC that will run after the
372 // registered actions and kills the process if it wasn't already killed.
373 // It might be useful to specify several debug actions, and possibly an
374 // alternate FATAL action.
375 enum WatchdogEvent {
376 UNKNOWN = 0;
377 KILL = 1;
378 MULTIKILL = 2;
379 MEGAMISS = 3;
380 MISS = 4;
381 }
382
383 // Extension specific configuration for the action.
384 core.v4alpha.TypedExtensionConfig config = 1;
385
386 WatchdogEvent event = 2 [(validate.rules).enum = {defined_only: true}];
387 }
388
389 // Register actions that will fire on given WatchDog events.
390 // See *WatchDogAction* for priority of events.
391 repeated WatchdogAction actions = 7;
392
393 // The duration after which Envoy counts a nonresponsive thread in the
394 // *watchdog_miss* statistic. If not specified the default is 200ms.
395 google.protobuf.Duration miss_timeout = 1;
396
397 // The duration after which Envoy counts a nonresponsive thread in the
398 // *watchdog_mega_miss* statistic. If not specified the default is
399 // 1000ms.
400 google.protobuf.Duration megamiss_timeout = 2;
401
402 // If a watched thread has been nonresponsive for this duration, assume a
403 // programming error and kill the entire Envoy process. Set to 0 to disable
404 // kill behavior. If not specified the default is 0 (disabled).
405 google.protobuf.Duration kill_timeout = 3;
406
407 // Defines the maximum jitter used to adjust the *kill_timeout* if *kill_timeout* is
408 // enabled. Enabling this feature would help to reduce risk of synchronized
409 // watchdog kill events across proxies due to external triggers. Set to 0 to
410 // disable. If not specified the default is 0 (disabled).
411 google.protobuf.Duration max_kill_timeout_jitter = 6 [(validate.rules).duration = {gte {}}];
412
413 // If max(2, ceil(registered_threads * Fraction(*multikill_threshold*)))
414 // threads have been nonresponsive for at least this duration kill the entire
415 // Envoy process. Set to 0 to disable this behavior. If not specified the
416 // default is 0 (disabled).
417 google.protobuf.Duration multikill_timeout = 4;
418
419 // Sets the threshold for *multikill_timeout* in terms of the percentage of
420 // nonresponsive threads required for the *multikill_timeout*.
421 // If not specified the default is 0.
422 type.v3.Percent multikill_threshold = 5;
423}
424
425// Fatal actions to run while crashing. Actions can be safe (meaning they are
426// async-signal safe) or unsafe. We run all safe actions before we run unsafe actions.
427// If using an unsafe action that could get stuck or deadlock, it important to
428// have an out of band system to terminate the process.
429//
430// The interface for the extension is ``Envoy::Server::Configuration::FatalAction``.
431// *FatalAction* extensions live in the ``envoy.extensions.fatal_actions`` API
432// namespace.
433message FatalAction {
434 option (udpa.annotations.versioning).previous_message_type =
435 "envoy.config.bootstrap.v3.FatalAction";
436
437 // Extension specific configuration for the action. It's expected to conform
438 // to the ``Envoy::Server::Configuration::FatalAction`` interface.
439 core.v4alpha.TypedExtensionConfig config = 1;
440}
441
442// Runtime :ref:`configuration overview <config_runtime>` (deprecated).
443message Runtime {
444 option (udpa.annotations.versioning).previous_message_type = "envoy.config.bootstrap.v3.Runtime";
445
446 // The implementation assumes that the file system tree is accessed via a
447 // symbolic link. An atomic link swap is used when a new tree should be
448 // switched to. This parameter specifies the path to the symbolic link. Envoy
449 // will watch the location for changes and reload the file system tree when
450 // they happen. If this parameter is not set, there will be no disk based
451 // runtime.
452 string symlink_root = 1;
453
454 // Specifies the subdirectory to load within the root directory. This is
455 // useful if multiple systems share the same delivery mechanism. Envoy
456 // configuration elements can be contained in a dedicated subdirectory.
457 string subdirectory = 2;
458
459 // Specifies an optional subdirectory to load within the root directory. If
460 // specified and the directory exists, configuration values within this
461 // directory will override those found in the primary subdirectory. This is
462 // useful when Envoy is deployed across many different types of servers.
463 // Sometimes it is useful to have a per service cluster directory for runtime
464 // configuration. See below for exactly how the override directory is used.
465 string override_subdirectory = 3;
466
467 // Static base runtime. This will be :ref:`overridden
468 // <config_runtime_layering>` by other runtime layers, e.g.
469 // disk or admin. This follows the :ref:`runtime protobuf JSON representation
470 // encoding <config_runtime_proto_json>`.
471 google.protobuf.Struct base = 4;
472}
473
474// [#next-free-field: 6]
475message RuntimeLayer {
476 option (udpa.annotations.versioning).previous_message_type =
477 "envoy.config.bootstrap.v3.RuntimeLayer";
478
479 // :ref:`Disk runtime <config_runtime_local_disk>` layer.
480 message DiskLayer {
481 option (udpa.annotations.versioning).previous_message_type =
482 "envoy.config.bootstrap.v3.RuntimeLayer.DiskLayer";
483
484 // The implementation assumes that the file system tree is accessed via a
485 // symbolic link. An atomic link swap is used when a new tree should be
486 // switched to. This parameter specifies the path to the symbolic link.
487 // Envoy will watch the location for changes and reload the file system tree
488 // when they happen. See documentation on runtime :ref:`atomicity
489 // <config_runtime_atomicity>` for further details on how reloads are
490 // treated.
491 string symlink_root = 1;
492
493 // Specifies the subdirectory to load within the root directory. This is
494 // useful if multiple systems share the same delivery mechanism. Envoy
495 // configuration elements can be contained in a dedicated subdirectory.
496 string subdirectory = 3;
497
498 // :ref:`Append <config_runtime_local_disk_service_cluster_subdirs>` the
499 // service cluster to the path under symlink root.
500 bool append_service_cluster = 2;
501 }
502
503 // :ref:`Admin console runtime <config_runtime_admin>` layer.
504 message AdminLayer {
505 option (udpa.annotations.versioning).previous_message_type =
506 "envoy.config.bootstrap.v3.RuntimeLayer.AdminLayer";
507 }
508
509 // :ref:`Runtime Discovery Service (RTDS) <config_runtime_rtds>` layer.
510 message RtdsLayer {
511 option (udpa.annotations.versioning).previous_message_type =
512 "envoy.config.bootstrap.v3.RuntimeLayer.RtdsLayer";
513
514 // Resource to subscribe to at *rtds_config* for the RTDS layer.
515 string name = 1;
516
517 // RTDS configuration source.
518 core.v4alpha.ConfigSource rtds_config = 2;
519 }
520
521 // Descriptive name for the runtime layer. This is only used for the runtime
522 // :http:get:`/runtime` output.
523 string name = 1 [(validate.rules).string = {min_len: 1}];
524
525 oneof layer_specifier {
526 option (validate.required) = true;
527
528 // :ref:`Static runtime <config_runtime_bootstrap>` layer.
529 // This follows the :ref:`runtime protobuf JSON representation encoding
530 // <config_runtime_proto_json>`. Unlike static xDS resources, this static
531 // layer is overridable by later layers in the runtime virtual filesystem.
532 google.protobuf.Struct static_layer = 2;
533
534 DiskLayer disk_layer = 3;
535
536 AdminLayer admin_layer = 4;
537
538 RtdsLayer rtds_layer = 5;
539 }
540}
541
542// Runtime :ref:`configuration overview <config_runtime>`.
543message LayeredRuntime {
544 option (udpa.annotations.versioning).previous_message_type =
545 "envoy.config.bootstrap.v3.LayeredRuntime";
546
547 // The :ref:`layers <config_runtime_layering>` of the runtime. This is ordered
548 // such that later layers in the list overlay earlier entries.
549 repeated RuntimeLayer layers = 1;
550}
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