src/main/java/com/google/devtools/build/lib/buildeventstream/proto/build_event_stream.proto

// Copyright 2016 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package build_event_stream;

import "google/protobuf/duration.proto";
import "google/protobuf/timestamp.proto";
import "src/main/protobuf/command_line.proto";
import "src/main/protobuf/failure_details.proto";
import "src/main/protobuf/invocation_policy.proto";

option java_package = "com.google.devtools.build.lib.buildeventstream";
option java_outer_classname = "BuildEventStreamProtos";

// Identifier for a build event. It is deliberately structured to also provide
// information about which build target etc the event is related to.
//
// Events are chained via the event id as follows: each event has an id and a
// set of ids of children events such that apart from the initial event each
// event has an id that is mentioned as child id in an earlier event and a build
// invocation is complete if and only if all direct and indirect children of the
// initial event have been posted.
message BuildEventId {
  // Generic identifier for a build event. This is the default type of
  // BuildEventId, but should not be used outside testing; nevertheless,
  // tools should handle build events with this kind of id gracefully.
  message UnknownBuildEventId {
    string details = 1;
  }

  // Identifier of an event reporting progress. Those events are also used to
  // chain in events that come early.
  message ProgressId {
    // Unique identifier. No assumption should be made about how the ids are
    // assigned; the only meaningful operation on this field is test for
    // equality.
    int32 opaque_count = 1;
  }

  // Identifier of an event indicating the beginning of a build; this will
  // normally be the first event.
  message BuildStartedId {}

  // Identifier on an event indicating the original commandline received by
  // the bazel server.
  message UnstructuredCommandLineId {}

  // Identifier on an event describing the commandline received by Bazel.
  message StructuredCommandLineId {
    // A title for this command line value, as there may be multiple.
    // For example, a single invocation may wish to report both the literal and
    // canonical command lines, and this label would be used to differentiate
    // between both versions.
    string command_line_label = 1;
  }

  // Identifier of an event indicating the workspace status.
  message WorkspaceStatusId {}

  // Identifier on an event reporting on the options included in the command
  // line, both explicitly and implicitly.
  message OptionsParsedId {}

  // Identifier of an event reporting that an external resource was fetched
  // from.
  message FetchId {
    // The external resource that was fetched from.
    string url = 1;
  }

  // Identifier of an event indicating that a target pattern has been expanded
  // further.
  // Messages of this shape are also used to describe parts of a pattern that
  // have been skipped for some reason, if the actual expansion was still
  // carried out (e.g., if keep_going is set). In this case, the
  // pattern_skipped choice in the id field is to be made.
  message PatternExpandedId {
    repeated string pattern = 1;
  }

  message WorkspaceConfigId {}

  message BuildMetadataId {}

  // Identifier of an event indicating that a target has been expanded by
  // identifying for which configurations it should be build.
  message TargetConfiguredId {
    string label = 1;

    // If empty, the id refers to the expansion of the target. If not-empty,
    // the id refers to the expansion of an aspect applied to the (already
    // expanded) target.
    //
    // For example, when building an apple_binary that depends on proto_library
    // "//:foo_proto", there will be two TargetConfigured events for
    // "//:foo_proto":
    //
    // 1. An event with an empty aspect, corresponding to actions producing
    // language-agnostic outputs from the proto_library; and
    // 2. An event with aspect "ObjcProtoAspect", corresponding to Objective-C
    // code generation.
    string aspect = 2;
  }

  // Identifier of an event introducing a named set of files (usually artifacts)
  // to be referred to in later messages.
  message NamedSetOfFilesId {
    // Identifier of the file set; this is an opaque string valid only for the
    // particular instance of the event stream.
    string id = 1;
  }

  // Identifier of an event introducing a configuration.
  message ConfigurationId {
    // Identifier of the configuration; users of the protocol should not make
    // any assumptions about it having any structure, or equality of the
    // identifier between different streams.
    string id = 1;
  }

  // Identifier of an event indicating that a target was built completely; this
  // does not include running the test if the target is a test target.
  message TargetCompletedId {
    string label = 1;

    // The configuration for which the target was built.
    ConfigurationId configuration = 3;

    // If empty, the id refers to the completion of the target. If not-empty,
    // the id refers to the completion of an aspect applied to the (already
    // completed) target.
    //
    // For example, when building an apple_binary that depends on proto_library
    // "//:foo_proto", there will be two TargetCompleted events for
    // "//:foo_proto":
    //
    // 1. An event with an empty aspect, corresponding to actions producing
    // language-agnostic outputs from the proto_library; and
    // 2. An event with aspect "ObjcProtoAspect", corresponding to Objective-C
    // code generation.
    string aspect = 2;
  }

  // Identifier of an event reporting that an action was completed (not all
  // actions are reported, only the ones that can be considered important;
  // this includes all failed actions).
  message ActionCompletedId {
    string primary_output = 1;
    // Optional, the label of the owner of the action, for reference.
    string label = 2;
    // Optional, the id of the configuration of the action owner.
    ConfigurationId configuration = 3;
  }

  // Identifier of an event reporting an event associated with an unconfigured
  // label. Usually, this indicates a failure due to a missing input file. In
  // any case, it will report some form of error (i.e., the payload will be an
  // Aborted event); there are no regular events using this identifier. The
  // purpose of those events is to serve as the root cause of a failed target.
  message UnconfiguredLabelId {
    string label = 1;
  }

  // Identifier of an event reporting an event associated with a configured
  // label, usually a visibility error. In any case, an event with such an
  // id will always report some form of error (i.e., the payload will be an
  // Aborted event); there are no regular events using this identifier.
  message ConfiguredLabelId {
    string label = 1;
    ConfigurationId configuration = 2;
  }

  // Identifier of an event reporting on an individual test run. The label
  // identifies the test that is reported about, the remaining fields are
  // in such a way as to uniquely identify the action within a build. In fact,
  // attempts for the same test, run, shard triple are counted sequentially,
  // starting with 1.
  message TestResultId {
    string label = 1;
    ConfigurationId configuration = 5;
    int32 run = 2;
    int32 shard = 3;
    int32 attempt = 4;
  }

  // Identifier of an event reporting the summary of a test.
  message TestSummaryId {
    string label = 1;
    ConfigurationId configuration = 2;
  }

  // Identifier of an event reporting the summary of a target.
  message TargetSummaryId {
    string label = 1;
    ConfigurationId configuration = 2;
  }

  // Identifier of the BuildFinished event, indicating the end of a build.
  message BuildFinishedId {}

  // Identifier of an event providing additional logs/statistics after
  // completion of the build.
  message BuildToolLogsId {}

  // Identifier of an event providing build metrics after completion
  // of the build.
  message BuildMetricsId {}

  // Identifier of an event providing convenience symlinks information.
  message ConvenienceSymlinksIdentifiedId {}

  oneof id {
    UnknownBuildEventId unknown = 1;
    ProgressId progress = 2;
    BuildStartedId started = 3;
    UnstructuredCommandLineId unstructured_command_line = 11;
    StructuredCommandLineId structured_command_line = 18;
    WorkspaceStatusId workspace_status = 14;
    OptionsParsedId options_parsed = 12;
    FetchId fetch = 17;
    ConfigurationId configuration = 15;
    TargetConfiguredId target_configured = 16;
    PatternExpandedId pattern = 4;
    PatternExpandedId pattern_skipped = 10;
    NamedSetOfFilesId named_set = 13;
    TargetCompletedId target_completed = 5;
    ActionCompletedId action_completed = 6;
    UnconfiguredLabelId unconfigured_label = 19;
    ConfiguredLabelId configured_label = 21;
    TestResultId test_result = 8;
    TestSummaryId test_summary = 7;
    TargetSummaryId target_summary = 26;
    BuildFinishedId build_finished = 9;
    BuildToolLogsId build_tool_logs = 20;
    BuildMetricsId build_metrics = 22;
    WorkspaceConfigId workspace = 23;
    BuildMetadataId build_metadata = 24;
    ConvenienceSymlinksIdentifiedId convenience_symlinks_identified = 25;
  }
}

// Payload of an event summarizing the progress of the build so far. Those
// events are also used to be parents of events where the more logical parent
// event cannot be posted yet as the needed information is not yet complete.
message Progress {
  // The next chunk of stdout that bazel produced since the last progress event
  // or the beginning of the build.
  string stdout = 1;

  // The next chunk of stderr that bazel produced since the last progress event
  // or the beginning of the build.
  string stderr = 2;
}

// Payload of an event indicating that an expected event will not come, as
// the build is aborted prematurely for some reason.
message Aborted {
  enum AbortReason {
    UNKNOWN = 0;

    // The user requested the build to be aborted (e.g., by hitting Ctl-C).
    USER_INTERRUPTED = 1;

    // The user requested that no analysis be performed.
    NO_ANALYZE = 8;

    // The user requested that no build be carried out.
    NO_BUILD = 9;

    // The build or target was aborted as a timeout was exceeded.
    TIME_OUT = 2;

    // The build or target was aborted as some remote environment (e.g., for
    // remote execution of actions) was not available in the expected way.
    REMOTE_ENVIRONMENT_FAILURE = 3;

    // Failure due to reasons entirely internal to the build tool, i.e. an
    // unexpected crash due to programmer error.
    INTERNAL = 4;

    // A Failure occurred in the loading phase of a target.
    LOADING_FAILURE = 5;

    // A Failure occurred in the analysis phase of a target.
    ANALYSIS_FAILURE = 6;

    // Target build was skipped (e.g. due to incompatible CPU constraints).
    SKIPPED = 7;

    // Build incomplete due to an earlier build failure (e.g. --keep_going was
    // set to false causing the build be ended upon failure).
    INCOMPLETE = 10;

    // The build tool ran out of memory and crashed.
    OUT_OF_MEMORY = 11;
  }
  AbortReason reason = 1;

  // A human readable description with more details about there reason, where
  // available and useful.
  string description = 2;
}

// Payload of an event indicating the beginning of a new build. Usually, events
// of those type start a new build-event stream. The target pattern requested
// to be build is contained in one of the announced child events; it is an
// invariant that precisely one of the announced child events has a non-empty
// target pattern.
message BuildStarted {
  string uuid = 1;

  // Start of the build in ms since the epoch.
  //
  // Deprecated, use `start_time` instead.
  //
  // TODO(yannic): Remove.
  int64 start_time_millis = 2 [deprecated = true];

  // Start of the build.
  google.protobuf.Timestamp start_time = 9;

  // Version of the build tool that is running.
  string build_tool_version = 3;

  // A human-readable description of all the non-default option settings
  string options_description = 4;

  // The name of the command that the user invoked.
  string command = 5;

  // The working directory from which the build tool was invoked.
  string working_directory = 6;

  // The directory of the workspace.
  string workspace_directory = 7;

  // The process ID of the Bazel server.
  int64 server_pid = 8;
}

// Configuration related to the blaze workspace and output tree.
message WorkspaceConfig {
  // The root of the local blaze exec root. All output files live underneath
  // this at "blaze-out/".
  string local_exec_root = 1;
}

// Payload of an event reporting the command-line of the invocation as
// originally received by the server. Note that this is not the command-line
// given by the user, as the client adds information about the invocation,
// like name and relevant entries of rc-files and client environment variables.
// However, it does contain enough information to reproduce the build
// invocation.
message UnstructuredCommandLine {
  repeated string args = 1;
}

// Payload of an event reporting on the parsed options, grouped in various ways.
message OptionsParsed {
  repeated string startup_options = 1;
  repeated string explicit_startup_options = 2;
  repeated string cmd_line = 3;
  repeated string explicit_cmd_line = 4;
  blaze.invocation_policy.InvocationPolicy invocation_policy = 5;
  string tool_tag = 6;
}

// Payload of an event indicating that an external resource was fetched. This
// event will only occur in streams where an actual fetch happened, not in ones
// where a cached copy of the entity to be fetched was used.
message Fetch {
  bool success = 1;
}

// Payload of an event reporting the workspace status. Key-value pairs can be
// provided by specifying the workspace_status_command to an executable that
// returns one key-value pair per line of output (key and value separated by a
// space).
message WorkspaceStatus {
  message Item {
    string key = 1;
    string value = 2;
  }
  repeated Item item = 1;
}

// Payload of an event reporting custom key-value metadata associated with the
// build.
message BuildMetadata {
  // Custom metadata for the build.
  map<string, string> metadata = 1;
}

// Payload of an event reporting details of a given configuration.
message Configuration {
  string mnemonic = 1;
  string platform_name = 2;
  string cpu = 3;
  map<string, string> make_variable = 4;
}

// Payload of the event indicating the expansion of a target pattern.
// The main information is in the chaining part: the id will contain the
// target pattern that was expanded and the children id will contain the
// target or target pattern it was expanded to.
message PatternExpanded {
  // Represents a test_suite target and the tests that it expanded to. Nested
  // test suites are recursively expanded. The test labels only contain the
  // final test targets, not any nested suites.
  message TestSuiteExpansion {
    // The label of the test_suite rule.
    string suite_label = 1;
    // Labels of the test targets included in the suite. Includes all tests in
    // the suite regardless of any filters or negative patterns which may result
    // in the test not actually being run.
    repeated string test_labels = 2;
  }

  // All test suites requested via top-level target patterns. Does not include
  // test suites whose label matched a negative pattern.
  repeated TestSuiteExpansion test_suite_expansions = 1;
}

// Enumeration type characterizing the size of a test, as specified by the
// test rule.
enum TestSize {
  UNKNOWN = 0;
  SMALL = 1;
  MEDIUM = 2;
  LARGE = 3;
  ENORMOUS = 4;
}

// Payload of the event indicating that the configurations for a target have
// been identified. As with pattern expansion the main information is in the
// chaining part: the id will contain the target that was configured and the
// children id will contain the configured targets it was configured to.
message TargetConfigured {
  // The kind of target (e.g.,  e.g. "cc_library rule", "source file",
  // "generated file") where the completion is reported.
  string target_kind = 1;

  // The size of the test, if the target is a test target. Unset otherwise.
  TestSize test_size = 2;

  // List of all tags associated with this target (for all possible
  // configurations).
  repeated string tag = 3;
}

message File {
  // A sequence of prefixes to apply to the file name to construct a full path.
  // In most but not all cases, there will be 3 entries:
  //  1. A root output directory, eg "bazel-out"
  //  2. A configuration mnemonic, eg "k8-fastbuild"
  //  3. An output category, eg "genfiles"
  repeated string path_prefix = 4;

  // identifier indicating the nature of the file (e.g., "stdout", "stderr")
  string name = 1;

  oneof file {
    // A location where the contents of the file can be found. The string is
    // encoded according to RFC2396.
    string uri = 2;
    // The contents of the file, if they are guaranteed to be short.
    bytes contents = 3;
  }
}

// Payload of a message to describe a set of files, usually build artifacts, to
// be referred to later by their name. In this way, files that occur identically
// as outputs of several targets have to be named only once.
message NamedSetOfFiles {
  // Files that belong to this named set of files.
  repeated File files = 1;

  // Other named sets whose members also belong to this set.
  repeated BuildEventId.NamedSetOfFilesId file_sets = 2;
}

// Payload of the event indicating the completion of an action. The main purpose
// of posting those events is to provide details on the root cause for a target
// failing; however, consumers of the build-event protocol must not assume
// that only failed actions are posted.
message ActionExecuted {
  bool success = 1;

  // The mnemonic of the action that was executed
  string type = 8;

  // The exit code of the action, if it is available.
  int32 exit_code = 2;

  // Location where to find the standard output of the action
  // (e.g., a file path).
  File stdout = 3;

  // Location where to find the standard error of the action
  // (e.g., a file path).
  File stderr = 4;

  // Deprecated. This field is now present on ActionCompletedId.
  string label = 5 [deprecated = true];

  // Deprecated. This field is now present on ActionCompletedId.
  BuildEventId.ConfigurationId configuration = 7 [deprecated = true];

  // Primary output; only provided for successful actions.
  File primary_output = 6;

  // The command-line of the action, if the action is a command.
  repeated string command_line = 9;

  // List of paths to log files
  repeated File action_metadata_logs = 10;

  // Only populated if success = false, and sometimes not even then.
  failure_details.FailureDetail failure_detail = 11;
}

// Collection of all output files belonging to that output group.
message OutputGroup {
  // Ids of fields that have been removed.
  reserved 2;

  // Name of the output group
  string name = 1;

  // List of file sets that belong to this output group as well.
  repeated BuildEventId.NamedSetOfFilesId file_sets = 3;

  // Indicates that one or more of the output group's files were not built
  // successfully (the generating action failed).
  bool incomplete = 4;
}

// Payload of the event indicating the completion of a target. The target is
// specified in the id. If the target failed the root causes are provided as
// children events.
message TargetComplete {
  bool success = 1;

  // The kind of target (e.g.,  e.g. "cc_library rule", "source file",
  // "generated file") where the completion is reported.
  // Deprecated: use the target_kind field in TargetConfigured instead.
  string target_kind = 5 [deprecated = true];

  // The size of the test, if the target is a test target. Unset otherwise.
  // Deprecated: use the test_size field in TargetConfigured instead.
  TestSize test_size = 6 [deprecated = true];

  // The output files are arranged by their output group. If an output file
  // is part of multiple output groups, it appears once in each output
  // group.
  repeated OutputGroup output_group = 2;

  // Temporarily, also report the important outputs directly. This is only to
  // allow existing clients help transition to the deduplicated representation;
  // new clients should not use it.
  repeated File important_output = 4 [deprecated = true];

  // Report output artifacts (referenced transitively via output_group) which
  // emit directories instead of singleton files. These directory_output entries
  // will never include a uri.
  repeated File directory_output = 8;

  // List of tags associated with this configured target.
  repeated string tag = 3;

  // The timeout specified for test actions under this configured target.
  //
  // Deprecated, use `test_timeout` instead.
  //
  // TODO(yannic): Remove.
  int64 test_timeout_seconds = 7 [deprecated = true];

  // The timeout specified for test actions under this configured target.
  google.protobuf.Duration test_timeout = 10;

  // Failure information about the target, only populated if success is false,
  // and sometimes not even then. Equal to one of the ActionExecuted
  // failure_detail fields for one of the root cause ActionExecuted events.
  failure_details.FailureDetail failure_detail = 9;
}

enum TestStatus {
  NO_STATUS = 0;
  PASSED = 1;
  FLAKY = 2;
  TIMEOUT = 3;
  FAILED = 4;
  INCOMPLETE = 5;
  REMOTE_FAILURE = 6;
  FAILED_TO_BUILD = 7;
  TOOL_HALTED_BEFORE_TESTING = 8;
}

// Payload on events reporting about individual test action.
message TestResult {
  reserved 1;

  // The status of this test.
  TestStatus status = 5;

  // Additional details about the status of the test. This is intended for
  // user display and must not be parsed.
  string status_details = 9;

  // True, if the reported attempt is taken from the tool's local cache.
  bool cached_locally = 4;

  // Time in milliseconds since the epoch at which the test attempt was started.
  // Note: for cached test results, this is time can be before the start of the
  // build.
  //
  // Deprecated, use `test_attempt_start` instead.
  //
  // TODO(yannic): Remove.
  int64 test_attempt_start_millis_epoch = 6 [deprecated = true];

  // Time at which the test attempt was started.
  // Note: for cached test results, this is time can be before the start of the
  // build.
  google.protobuf.Timestamp test_attempt_start = 10;

  // Time the test took to run. For locally cached results, this is the time
  // the cached invocation took when it was invoked.
  //
  // Deprecated, use `test_attempt_duration` instead.
  //
  // TODO(yannic): Remove.
  int64 test_attempt_duration_millis = 3 [deprecated = true];

  // Time the test took to run. For locally cached results, this is the time
  // the cached invocation took when it was invoked.
  google.protobuf.Duration test_attempt_duration = 11;

  // Files (logs, test.xml, undeclared outputs, etc) generated by that test
  // action.
  repeated File test_action_output = 2;

  // Warnings generated by that test action.
  repeated string warning = 7;

  // Message providing optional meta data on the execution of the test action,
  // if available.
  message ExecutionInfo {
    // Deprecated, use TargetComplete.test_timeout instead.
    int32 timeout_seconds = 1 [deprecated = true];

    // Name of the strategy to execute this test action (e.g., "local",
    // "remote")
    string strategy = 2;

    // True, if the reported attempt was a cache hit in a remote cache.
    bool cached_remotely = 6;

    // The exit code of the test action.
    int32 exit_code = 7;

    // The hostname of the machine where the test action was executed (in case
    // of remote execution), if known.
    string hostname = 3;

    // Represents a hierarchical timing breakdown of an activity.
    // The top level time should be the total time of the activity.
    // Invariant: `time` >= sum of `time`s of all direct children.
    message TimingBreakdown {
      repeated TimingBreakdown child = 1;
      string name = 2;
      // Deprecated, use `time` instead.
      //
      // TODO(yannic): Remove.
      int64 time_millis = 3 [deprecated = true];
      google.protobuf.Duration time = 4;
    }
    TimingBreakdown timing_breakdown = 4;

    message ResourceUsage {
      string name = 1;
      int64 value = 2;
    }
    repeated ResourceUsage resource_usage = 5;
  }
  ExecutionInfo execution_info = 8;
}

// Payload of the event summarizing a test.
message TestSummary {
  // Wrapper around BlazeTestStatus to support importing that enum to proto3.
  // Overall status of test, accumulated over all runs, shards, and attempts.
  TestStatus overall_status = 5;

  // Total number of runs
  int32 total_run_count = 1;

  // Number of runs.
  int32 run_count = 10;

  // Number of shards.
  int32 shard_count = 11;

  // Path to logs of passed runs.
  repeated File passed = 3;

  // Path to logs of failed runs;
  repeated File failed = 4;

  // Total number of cached test actions
  int32 total_num_cached = 6;

  // When the test first started running.
  //
  // Deprecated, use `first_start_time` instead.
  //
  // TODO(yannic): Remove.
  int64 first_start_time_millis = 7 [deprecated = true];

  // When the test first started running.
  google.protobuf.Timestamp first_start_time = 13;

  // When the last test action completed.
  //
  // Deprecated, use `last_stop_time` instead.
  //
  // TODO(yannic): Remove.
  int64 last_stop_time_millis = 8 [deprecated = true];

  // When the test first started running.
  google.protobuf.Timestamp last_stop_time = 14;

  // The total runtime of the test.
  //
  // Deprecated, use `total_run` instead.
  //
  // TODO(yannic): Remove.
  int64 total_run_duration_millis = 9 [deprecated = true];

  // The total runtime of the test.
  google.protobuf.Duration total_run_duration = 12;
}

// Payload of the event summarizing a target (test or non-test).
message TargetSummary {
  // Conjunction of TargetComplete events for this target, including aspects.
  bool overall_build_success = 1;

  // Repeats TestSummary's overall_status if available.
  TestStatus overall_test_status = 2;
}

// Event indicating the end of a build.
message BuildFinished {
  // Exit code of a build. The possible values correspond to the predefined
  // codes in bazel's lib.ExitCode class, as well as any custom exit code a
  // module might define. The predefined exit codes are subject to change (but
  // rarely do) and are not part of the public API.
  //
  // A build was successful iff ExitCode.code equals 0.
  message ExitCode {
    // The name of the exit code.
    string name = 1;

    // The exit code.
    int32 code = 2;
  }

  // Things that happened during the build that could be of interest.
  message AnomalyReport {
    // Was the build suspended at any time during the build.
    // Examples of suspensions are SIGSTOP, or the hardware being put to sleep.
    // If was_suspended is true, then most of the timings for this build are
    // suspect.
    bool was_suspended = 1;
  }

  // If the build succeeded or failed.
  bool overall_success = 1 [deprecated = true];

  // The overall status of the build. A build was successful iff
  // ExitCode.code equals 0.
  ExitCode exit_code = 3;

  // End of the build in ms since the epoch.
  //
  // Deprecated, use `finish_time` instead.
  //
  // TODO(yannic): Remove.
  int64 finish_time_millis = 2 [deprecated = true];

  // End of the build.
  google.protobuf.Timestamp finish_time = 5;

  AnomalyReport anomaly_report = 4;
}

message BuildMetrics {
  message ActionSummary {
    // The total number of actions created and registered during the build,
    // including both aspects and configured targets. This metric includes
    // unused actions that were constructed but not executed during this build.
    // It does not include actions that were created on prior builds that are
    // still valid, even if those actions had to be re-executed on this build.
    // For the total number of actions that would be created if this invocation
    // were "clean", see BuildGraphMetrics below.
    int64 actions_created = 1;

    // The total number of actions created this build just by configured
    // targets. Used mainly to allow consumers of actions_created, which used to
    // not include aspects' actions, to normalize across the Blaze release that
    // switched actions_created to include all created actions.
    int64 actions_created_not_including_aspects = 3;

    // The total number of actions executed during the build. This includes any
    // remote cache hits, but excludes local action cache hits.
    int64 actions_executed = 2;
  }
  ActionSummary action_summary = 1;

  message MemoryMetrics {
    // Size of the JVM heap post build in bytes. This is only collected if
    // --bep_publish_used_heap_size_post_build is set,
    // since it forces a full GC.
    int64 used_heap_size_post_build = 1;

    // Size of the peak JVM heap size in bytes post GC. Note that this reports 0
    // if there was no major GC during the build.
    int64 peak_post_gc_heap_size = 2;
  }
  MemoryMetrics memory_metrics = 2;

  message TargetMetrics {
    // DEPRECATED
    // No longer populated. It never measured what it was supposed to (targets
    // loaded): it counted targets that were analyzed even if the underlying
    // package had not changed.
    // TODO(janakr): rename and remove.
    int64 targets_loaded = 1;

    // Number of targets/aspects configured during this build. Does not include
    // targets/aspects that were configured on prior builds on this server and
    // were cached. See BuildGraphMetrics below if you need that.
    int64 targets_configured = 2;

    // Number of configured targets analyzed during this build. Does not include
    // aspects. Used mainly to allow consumers of targets_configured, which used
    // to not include aspects, to normalize across the Blaze release that
    // switched targets_configured to include aspects.
    int64 targets_configured_not_including_aspects = 3;
  }
  TargetMetrics target_metrics = 3;

  message PackageMetrics {
    // Number of BUILD files (aka packages) loaded during this build.
    int64 packages_loaded = 1;
  }
  PackageMetrics package_metrics = 4;

  message TimingMetrics {
    // The CPU time in milliseconds consumed during this build.
    int64 cpu_time_in_ms = 1;
    // The elapsed wall time in milliseconds during this build.
    int64 wall_time_in_ms = 2;
    // The elapsed wall time in milliseconds during the analysis phase.
    int64 analysis_phase_time_in_ms = 3;
  }
  TimingMetrics timing_metrics = 5;

  message CumulativeMetrics {
    // One-indexed number of "analyses" the server has run, including the
    // current one. Will be incremented for every build/test/cquery/etc. command
    // that reaches the analysis phase.
    int32 num_analyses = 11;
    // One-indexed number of "builds" the server has run, including the current
    // one. Will be incremented for every build/test/run/etc. command that
    // reaches the execution phase.
    int32 num_builds = 12;
  }

  CumulativeMetrics cumulative_metrics = 6;

  message ArtifactMetrics {
    reserved 1;

    message FilesMetric {
      int64 size_in_bytes = 1;
      int32 count = 2;
    }

    // Measures all source files newly read this build. Does not include
    // unchanged sources on incremental builds.
    FilesMetric source_artifacts_read = 2;
    // Measures all output artifacts from executed actions. This includes
    // actions that were cached locally (via the action cache) or remotely (via
    // a remote cache or executor), but does *not* include outputs of actions
    // that were cached internally in Skyframe.
    FilesMetric output_artifacts_seen = 3;
    // Measures all output artifacts from actions that were cached locally
    // via the action cache. These artifacts were already present on disk at the
    // start of the build. Does not include Skyframe-cached actions' outputs.
    FilesMetric output_artifacts_from_action_cache = 4;
    // Measures all artifacts that belong to a top-level output group. Does not
    // deduplicate, so if there are two top-level targets in this build that
    // share an artifact, it will be counted twice.
    FilesMetric top_level_artifacts = 5;
  }

  ArtifactMetrics artifact_metrics = 7;

  // Information about the size and shape of the build graph. Some fields may
  // not be populated if Bazel was able to skip steps due to caching.
  message BuildGraphMetrics {
    // How many configured targets/aspects were in this build, including any
    // that were analyzed on a prior build and are still valid. May not be
    // populated if analysis phase was fully cached. Note: for historical
    // reasons this includes input/output files and other configured targets
    // that do not actually have associated actions.
    int32 action_lookup_value_count = 1;
    // How many configured targets alone were in this build: always at most
    // action_lookup_value_count. Useful mainly for historical comparisons to
    // TargetMetrics.targets_configured, which used to not count aspects. This
    // also includes configured targets that do not have associated actions.
    int32 action_lookup_value_count_not_including_aspects = 5;
    // How many actions belonged to the configured targets/aspects above. It may
    // not be necessary to execute all of these actions to build the requested
    // targets. May not be populated if analysis phase was fully cached.
    int32 action_count = 2;
    // How many actions belonged to configured targets: always at most
    // action_count. Useful mainly for historical comparisons to
    // ActionMetrics.actions_created, which used to not count aspects' actions.
    int32 action_count_not_including_aspects = 6;
    // How many "input file" configured targets there were: one per source file.
    // Should agree with artifact_metrics.source_artifacts_read.count above,
    int32 input_file_configured_target_count = 7;
    // How many "output file" configured targets there were: output files that
    // are targets (not implicit outputs).
    int32 output_file_configured_target_count = 8;
    // How many "other" configured targets there were (like alias,
    // package_group, and other non-rule non-file configured targets).
    int32 other_configured_target_count = 9;
    // How many artifacts are outputs of the above actions. May not be populated
    // if analysis phase was fully cached.
    int32 output_artifact_count = 3;
    // How many Skyframe nodes there are in memory at the end of the build. This
    // may underestimate the number of nodes when running with memory-saving
    // settings or with Skybuild, and may overestimate if there are nodes from
    // prior evaluations still in the cache.
    int32 post_invocation_skyframe_node_count = 4;
  }

  BuildGraphMetrics build_graph_metrics = 8;
}

// Event providing additional statistics/logs after completion of the build.
message BuildToolLogs {
  repeated File log = 1;
}

// Event describing all convenience symlinks (i.e., workspace symlinks) to be
// created or deleted once the execution phase has begun. Note that this event
// does not say anything about whether or not the build tool actually executed
// these filesystem operations; it only says what logical operations should be
// performed. This event is emitted exactly once per build; if no symlinks are
// to be modified, the event is still emitted with empty contents.
message ConvenienceSymlinksIdentified {
  repeated ConvenienceSymlink convenience_symlinks = 1;
}

// The message that contains what type of action to perform on a given path and
// target of a symlink.
message ConvenienceSymlink {
  enum Action {
    UNKNOWN = 0;

    // Indicates a symlink should be created, or overwritten if it already
    // exists.
    CREATE = 1;

    // Indicates a symlink should be deleted if it already exists.
    DELETE = 2;
  }

  // The path of the symlink to be created or deleted, absolute or relative to
  // the workspace, creating any directories necessary. If a symlink already
  // exists at that location, then it should be replaced by a symlink pointing
  // to the new target.
  string path = 1;

  // The operation we are performing on the symlink.
  Action action = 2;

  // If action is CREATE, this is the target path that the symlink should point
  // to. If the path points underneath the output base, it is relative to the
  // output base; otherwise it is absolute.
  //
  // If action is DELETE, this field is not set.
  string target = 3;
}

// Message describing a build event. Events will have an identifier that
// is unique within a given build invocation; they also announce follow-up
// events as children. More details, which are specific to the kind of event
// that is observed, is provided in the payload. More options for the payload
// might be added in the future.
message BuildEvent {
  reserved 11, 19;
  BuildEventId id = 1;
  repeated BuildEventId children = 2;
  bool last_message = 20;
  oneof payload {
    Progress progress = 3;
    Aborted aborted = 4;
    BuildStarted started = 5;
    UnstructuredCommandLine unstructured_command_line = 12;
    command_line.CommandLine structured_command_line = 22;
    OptionsParsed options_parsed = 13;
    WorkspaceStatus workspace_status = 16;
    Fetch fetch = 21;
    Configuration configuration = 17;
    PatternExpanded expanded = 6;
    TargetConfigured configured = 18;
    ActionExecuted action = 7;
    NamedSetOfFiles named_set_of_files = 15;
    TargetComplete completed = 8;
    TestResult test_result = 10;
    TestSummary test_summary = 9;
    TargetSummary target_summary = 28;
    BuildFinished finished = 14;
    BuildToolLogs build_tool_logs = 23;
    BuildMetrics build_metrics = 24;
    WorkspaceConfig workspace_info = 25;
    BuildMetadata build_metadata = 26;
    ConvenienceSymlinksIdentified convenience_symlinks_identified = 27;
  }
}