Add graphql for Sentry error details

- Squashed commit containing GraphQL changes

app/graphql/resolvers/error_tracking/sentry_detailed_error_resolver.rb

+# frozen_string_literal: true
+
+module Resolvers
+  module ErrorTracking
+    class SentryDetailedErrorResolver < BaseResolver
+      argument :id, GraphQL::ID_TYPE,
+                required: true,
+                description: 'ID of the Sentry issue'
+
+      def resolve(**args)
+        project = object
+        current_user = context[:current_user]
+        issue_id = GlobalID.parse(args[:id]).model_id
+
+        # Get data from Sentry
+        response = ::ErrorTracking::IssueDetailsService.new(
+          project,
+          current_user,
+          { issue_id: issue_id }
+        ).execute
+        issue = response[:issue]
+        issue.gitlab_project = project if issue
+
+        issue
+      end
+    end
+  end
+end

app/graphql/types/error_tracking/sentry_detailed_error_type.rb

+# frozen_string_literal: true
+
+module Types
+  module ErrorTracking
+    class SentryDetailedErrorType < ::Types::BaseObject
+      graphql_name 'SentryDetailedError'
+
+      present_using SentryDetailedErrorPresenter
+
+      authorize :read_sentry_issue
+
+      field :id, GraphQL::ID_TYPE,
+            null: false,
+            description: "ID (global ID) of the error"
+      field :sentry_id, GraphQL::STRING_TYPE,
+            method: :id,
+            null: false,
+            description: "ID (Sentry ID) of the error"
+      field :title, GraphQL::STRING_TYPE,
+            null: false,
+            description: "Title of the error"
+      field :type, GraphQL::STRING_TYPE,
+            null: false,
+            description: "Type of the error"
+      field :user_count, GraphQL::INT_TYPE,
+            null: false,
+            description: "Count of users affected by the error"
+      field :count, GraphQL::INT_TYPE,
+            null: false,
+            description: "Count of occurrences"
+      field :first_seen, Types::TimeType,
+            null: false,
+            description: "Timestamp when the error was first seen"
+      field :last_seen, Types::TimeType,
+            null: false,
+            description: "Timestamp when the error was last seen"
+      field :message, GraphQL::STRING_TYPE,
+            null: true,
+            description: "Sentry metadata message of the error"
+      field :culprit, GraphQL::STRING_TYPE,
+            null: false,
+            description: "Culprit of the error"
+      field :external_url, GraphQL::STRING_TYPE,
+            null: false,
+            description: "External URL of the error"
+      field :sentry_project_id, GraphQL::ID_TYPE,
+            method: :project_id,
+            null: false,
+            description: "ID of the project (Sentry project)"
+      field :sentry_project_name, GraphQL::STRING_TYPE,
+            method: :project_name,
+            null: false,
+            description: "Name of the project affected by the error"
+      field :sentry_project_slug, GraphQL::STRING_TYPE,
+            method: :project_slug,
+            null: false,
+            description: "Slug of the project affected by the error"
+      field :short_id, GraphQL::STRING_TYPE,
+            null: false,
+            description: "Short ID (Sentry ID) of the error"
+      field :status, Types::ErrorTracking::SentryErrorStatusEnum,
+            null: false,
+            description: "Status of the error"
+      field :frequency, [Types::ErrorTracking::SentryErrorFrequencyType],
+            null: false,
+            description: "Last 24hr stats of the error"
+      field :first_release_last_commit, GraphQL::STRING_TYPE,
+            null: true,
+            description: "Commit the error was first seen"
+      field :last_release_last_commit, GraphQL::STRING_TYPE,
+            null: true,
+            description: "Commit the error was last seen"
+      field :first_release_short_version, GraphQL::STRING_TYPE,
+            null: true,
+            description: "Release version the error was first seen"
+      field :last_release_short_version, GraphQL::STRING_TYPE,
+            null: true,
+            description: "Release version the error was last seen"
+
+      def first_seen
+        DateTime.parse(object.first_seen)
+      end
+
+      def last_seen
+        DateTime.parse(object.last_seen)
+      end
+
+      def project_id
+        Gitlab::GlobalId.build(model_name: 'Project', id: object.project_id).to_s
+      end
+    end
+  end
+end

app/graphql/types/error_tracking/sentry_error_frequency_type.rb

+# frozen_string_literal: true
+
+module Types
+  module ErrorTracking
+    # rubocop: disable Graphql/AuthorizeTypes
+    class SentryErrorFrequencyType < ::Types::BaseObject
+      graphql_name 'SentryErrorFrequency'
+
+      field :time, Types::TimeType,
+        null: false,
+        description: "Time the error frequency stats were recorded"
+      field :count, GraphQL::INT_TYPE,
+        null: false,
+        description: "Count of errors received since the previously recorded time"
+    end
+    # rubocop: enable Graphql/AuthorizeTypes
+  end
+end

app/graphql/types/error_tracking/sentry_error_status_enum.rb

+# frozen_string_literal: true
+
+module Types
+  module ErrorTracking
+    class SentryErrorStatusEnum < ::Types::BaseEnum
+      graphql_name 'SentryErrorStatus'
+      description 'State of a Sentry error'
+
+      value 'RESOLVED', value: 'resolved', description: 'Error has been resolved'
+      value 'RESOLVED_IN_NEXT_RELEASE', value: 'resolvedInNextRelease', description: 'Error has been ignored until next release'
+      value 'UNRESOLVED', value: 'unresolved', description: 'Error is unresolved'
+      value 'IGNORED', value: 'ignored', description: 'Error has been ignored'
+    end
+  end
+end

app/graphql/types/project_type.rb

@@ -145,5 +145,11 @@ module Types
           null: true,
           description: 'Build pipelines of the project',
           resolver: Resolvers::ProjectPipelinesResolver
+
+    field :sentry_detailed_error,
+          Types::ErrorTracking::SentryDetailedErrorType,
+          null: true,
+          description: 'Detailed version of a Sentry error on the project',
+          resolver: Resolvers::ErrorTracking::SentryDetailedErrorResolver
   end
 end

app/policies/error_tracking/detailed_error_policy.rb

+# frozen_string_literal: true
+
+module ErrorTracking
+  class DetailedErrorPolicy < BasePolicy
+    delegate { @subject.gitlab_project }
+  end
+end

app/presenters/sentry_detailed_error_presenter.rb

+# frozen_string_literal: true
+
+class SentryDetailedErrorPresenter < Gitlab::View::Presenter::Delegated
+  presents :error
+
+  FrequencyStruct = Struct.new(:time, :count, keyword_init: true)
+
+  def frequency
+    utc_offset = Time.zone_offset('UTC')
+
+    error.frequency.map do |f|
+      FrequencyStruct.new(time: Time.at(f[0], in: utc_offset), count: f[1])
+    end
+  end
+end

changelogs/unreleased/34943-graphql-sentry-details.yml

+---
+title: GraphQL for Sentry rror details
+merge_request: 19733
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -4400,6 +4400,16 @@ type Project {
   """
   requestAccessEnabled: Boolean
 
+  """
+  Detailed version of a Sentry error on the project
+  """
+  sentryDetailedError(
+    """
+    ID of the Sentry issue
+    """
+    id: ID!
+  ): SentryDetailedError
+
   """
   Indicates if shared runners are enabled on the project
   """
@@ -4886,6 +4896,150 @@ type RootStorageStatistics {
   wikiSize: Int!
 }
 
+type SentryDetailedError {
+  """
+  Count of occurrences
+  """
+  count: Int!
+
+  """
+  Culprit of the error
+  """
+  culprit: String!
+
+  """
+  External URL of the error
+  """
+  externalUrl: String!
+
+  """
+  Commit the error was first seen
+  """
+  firstReleaseLastCommit: String
+
+  """
+  Release version the error was first seen
+  """
+  firstReleaseShortVersion: String
+
+  """
+  Timestamp when the error was first seen
+  """
+  firstSeen: Time!
+
+  """
+  Last 24hr stats of the error
+  """
+  frequency: [SentryErrorFrequency!]!
+
+  """
+  ID (global ID) of the error
+  """
+  id: ID!
+
+  """
+  Commit the error was last seen
+  """
+  lastReleaseLastCommit: String
+
+  """
+  Release version the error was last seen
+  """
+  lastReleaseShortVersion: String
+
+  """
+  Timestamp when the error was last seen
+  """
+  lastSeen: Time!
+
+  """
+  Sentry metadata message of the error
+  """
+  message: String
+
+  """
+  ID (Sentry ID) of the error
+  """
+  sentryId: String!
+
+  """
+  ID of the project (Sentry project)
+  """
+  sentryProjectId: ID!
+
+  """
+  Name of the project affected by the error
+  """
+  sentryProjectName: String!
+
+  """
+  Slug of the project affected by the error
+  """
+  sentryProjectSlug: String!
+
+  """
+  Short ID (Sentry ID) of the error
+  """
+  shortId: String!
+
+  """
+  Status of the error
+  """
+  status: SentryErrorStatus!
+
+  """
+  Title of the error
+  """
+  title: String!
+
+  """
+  Type of the error
+  """
+  type: String!
+
+  """
+  Count of users affected by the error
+  """
+  userCount: Int!
+}
+
+type SentryErrorFrequency {
+  """
+  Count of errors received since the previously recorded time
+  """
+  count: Int!
+
+  """
+  Time the error frequency stats were recorded
+  """
+  time: Time!
+}
+
+"""
+State of a Sentry error
+"""
+enum SentryErrorStatus {
+  """
+  Error has been ignored
+  """
+  IGNORED
+
+  """
+  Error has been resolved
+  """
+  RESOLVED
+
+  """
+  Error has been ignored until next release
+  """
+  RESOLVED_IN_NEXT_RELEASE
+
+  """
+  Error is unresolved
+  """
+  UNRESOLVED
+}
+
 type Submodule implements Entry {
   flatPath: String!
   id: ID!

doc/api/graphql/reference/gitlab_schema.json

@@ -1166,6 +1166,33 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "sentryDetailedError",
+              "description": "Detailed version of a Sentry error on the project",
+              "args": [
+                {
+                  "name": "id",
+                  "description": "ID of the Sentry issue",
+                  "type": {
+                    "kind": "NON_NULL",
+                    "name": null,
+                    "ofType": {
+                      "kind": "SCALAR",
+                      "name": "ID",
+                      "ofType": null
+                    }
+                  },
+                  "defaultValue": null
+                }
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "SentryDetailedError",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "sharedRunnersEnabled",
               "description": "Indicates if shared runners are enabled on the project",
@@ -13788,6 +13815,469 @@
           ],
           "possibleTypes": null
         },
+        {
+          "kind": "OBJECT",
+          "name": "SentryDetailedError",
+          "description": null,
+          "fields": [
+            {
+              "name": "count",
+              "description": "Count of occurrences",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "Int",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "culprit",
+              "description": "Culprit of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "externalUrl",
+              "description": "External URL of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "firstReleaseLastCommit",
+              "description": "Commit the error was first seen",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "String",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "firstReleaseShortVersion",
+              "description": "Release version the error was first seen",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "String",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "firstSeen",
+              "description": "Timestamp when the error was first seen",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "Time",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "frequency",
+              "description": "Last 24hr stats of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "LIST",
+                  "name": null,
+                  "ofType": {
+                    "kind": "NON_NULL",
+                    "name": null,
+                    "ofType": {
+                      "kind": "OBJECT",
+                      "name": "SentryErrorFrequency",
+                      "ofType": null
+                    }
+                  }
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "id",
+              "description": "ID (global ID) of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "ID",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "lastReleaseLastCommit",
+              "description": "Commit the error was last seen",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "String",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "lastReleaseShortVersion",
+              "description": "Release version the error was last seen",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "String",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "lastSeen",
+              "description": "Timestamp when the error was last seen",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "Time",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "message",
+              "description": "Sentry metadata message of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "String",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "sentryId",
+              "description": "ID (Sentry ID) of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "sentryProjectId",
+              "description": "ID of the project (Sentry project)",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "ID",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "sentryProjectName",
+              "description": "Name of the project affected by the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "sentryProjectSlug",
+              "description": "Slug of the project affected by the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "shortId",
+              "description": "Short ID (Sentry ID) of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "status",
+              "description": "Status of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "ENUM",
+                  "name": "SentryErrorStatus",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "title",
+              "description": "Title of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "type",
+              "description": "Type of the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "userCount",
+              "description": "Count of users affected by the error",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "Int",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            }
+          ],
+          "inputFields": null,
+          "interfaces": [
+
+          ],
+          "enumValues": null,
+          "possibleTypes": null
+        },
+        {
+          "kind": "ENUM",
+          "name": "SentryErrorStatus",
+          "description": "State of a Sentry error",
+          "fields": null,
+          "inputFields": null,
+          "interfaces": null,
+          "enumValues": [
+            {
+              "name": "RESOLVED",
+              "description": "Error has been resolved",
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "RESOLVED_IN_NEXT_RELEASE",
+              "description": "Error has been ignored until next release",
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "UNRESOLVED",
+              "description": "Error is unresolved",
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "IGNORED",
+              "description": "Error has been ignored",
+              "isDeprecated": false,
+              "deprecationReason": null
+            }
+          ],
+          "possibleTypes": null
+        },
+        {
+          "kind": "OBJECT",
+          "name": "SentryErrorFrequency",
+          "description": null,
+          "fields": [
+            {
+              "name": "count",
+              "description": "Count of errors received since the previously recorded time",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "Int",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "time",
+              "description": "Time the error frequency stats were recorded",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "Time",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            }
+          ],
+          "inputFields": null,
+          "interfaces": [
+
+          ],
+          "enumValues": null,
+          "possibleTypes": null
+        },
         {
           "kind": "OBJECT",
           "name": "Metadata",

doc/api/graphql/reference/index.md

@@ -664,6 +664,7 @@ The API can be explored interactively using the [GraphiQL IDE](../index.md#graph
 | `repository` | Repository | Git repository of the project |
 | `mergeRequest` | MergeRequest | A single merge request of the project |
 | `issue` | Issue | A single issue of the project |
+| `sentryDetailedError` | SentryDetailedError | Detailed version of a Sentry error on the project |
 
 ### ProjectPermissions
 
@@ -751,6 +752,39 @@ The API can be explored interactively using the [GraphiQL IDE](../index.md#graph
 | `packagesSize` | Int! | The packages size in bytes |
 | `wikiSize` | Int! | The wiki size in bytes |
 
+### SentryDetailedError
+
+| Name  | Type  | Description |
+| ---   |  ---- | ----------  |
+| `id` | ID! | ID (global ID) of the error |
+| `sentryId` | String! | ID (Sentry ID) of the error |
+| `title` | String! | Title of the error |
+| `type` | String! | Type of the error |
+| `userCount` | Int! | Count of users affected by the error |
+| `count` | Int! | Count of occurrences |
+| `firstSeen` | Time! | Timestamp when the error was first seen |
+| `lastSeen` | Time! | Timestamp when the error was last seen |
+| `message` | String | Sentry metadata message of the error |
+| `culprit` | String! | Culprit of the error |
+| `externalUrl` | String! | External URL of the error |
+| `sentryProjectId` | ID! | ID of the project (Sentry project) |
+| `sentryProjectName` | String! | Name of the project affected by the error |
+| `sentryProjectSlug` | String! | Slug of the project affected by the error |
+| `shortId` | String! | Short ID (Sentry ID) of the error |
+| `status` | SentryErrorStatus! | Status of the error |
+| `frequency` | SentryErrorFrequency! => Array | Last 24hr stats of the error |
+| `firstReleaseLastCommit` | String | Commit the error was first seen |
+| `lastReleaseLastCommit` | String | Commit the error was last seen |
+| `firstReleaseShortVersion` | String | Release version the error was first seen |
+| `lastReleaseShortVersion` | String | Release version the error was last seen |
+
+### SentryErrorFrequency
+
+| Name  | Type  | Description |
+| ---   |  ---- | ----------  |
+| `time` | Time! | Time the error frequency stats were recorded |
+| `count` | Int! | Count of errors received since the previously recorded time |
+
 ### Submodule
 
 | Name  | Type  | Description |

lib/gitlab/error_tracking/detailed_error.rb

@@ -4,6 +4,7 @@ module Gitlab
   module ErrorTracking
     class DetailedError
       include ActiveModel::Model
+      include GlobalID::Identification
 
       attr_accessor :count,
                     :culprit,
@@ -13,6 +14,7 @@ module Gitlab
                     :first_release_short_version,
                     :first_seen,
                     :frequency,
+                    :gitlab_project,
                     :id,
                     :last_release_last_commit,
                     :last_release_short_version,
@@ -26,6 +28,10 @@ module Gitlab
                     :title,
                     :type,
                     :user_count
+
+      def self.declarative_policy_class
+        'ErrorTracking::DetailedErrorPolicy'
+      end
     end
   end
 end

spec/factories/error_tracking/detailed_error.rb

@@ -2,13 +2,13 @@
 
 FactoryBot.define do
   factory :detailed_error_tracking_error, class: Gitlab::ErrorTracking::DetailedError do
-    id { 'id' }
+    id { '1' }
     title { 'title' }
     type { 'error' }
     user_count { 1 }
     count { 2 }
-    first_seen { Time.now }
-    last_seen { Time.now }
+    first_seen { Time.now.iso8601 }
+    last_seen { Time.now.iso8601 }
     message { 'message' }
     culprit { 'culprit' }
     external_url { 'http://example.com/id' }
@@ -18,7 +18,11 @@ FactoryBot.define do
     project_slug { 'project_name' }
     short_id { 'ID' }
     status { 'unresolved' }
-    frequency { [] }
+    frequency do
+      [
+        [Time.now.to_i, 10]
+      ]
+    end
     first_release_last_commit { '68c914da9' }
     last_release_last_commit { '9ad419c86' }
     first_release_short_version { 'abc123' }

spec/graphql/resolvers/error_tracking/sentry_detailed_error_resolver_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Resolvers::ErrorTracking::SentryDetailedErrorResolver do
+  include GraphqlHelpers
+
+  let_it_be(:project) { create(:project) }
+  let_it_be(:current_user) { create(:user) }
+
+  let(:issue_details_service) { spy('ErrorTracking::IssueDetailsService') }
+
+  before do
+    project.add_developer(current_user)
+
+    allow(ErrorTracking::IssueDetailsService)
+      .to receive(:new)
+      .and_return issue_details_service
+  end
+
+  describe '#resolve' do
+    let(:args) { { id: issue_global_id(1234) } }
+    it 'fetches the data via the sentry API' do
+      resolve_error(args)
+
+      expect(issue_details_service).to have_received(:execute)
+    end
+
+    context 'error matched' do
+      let(:detailed_error) { build(:detailed_error_tracking_error) }
+
+      before do
+        allow(issue_details_service).to receive(:execute)
+          .and_return({ issue: detailed_error })
+      end
+
+      it 'resolves to a detailed error' do
+        expect(resolve_error(args)).to eq detailed_error
+      end
+
+      it 'assigns the gitlab project' do
+        expect(resolve_error(args).gitlab_project).to eq project
+      end
+    end
+
+    it 'resolves to nil if no match' do
+      allow(issue_details_service).to receive(:execute)
+        .and_return({ issue: nil })
+
+      result = resolve_error(args)
+      expect(result).to eq nil
+    end
+  end
+
+  def resolve_error(args = {}, context = { current_user: current_user })
+    resolve(described_class, obj: project, args: args, ctx: context)
+  end
+
+  def issue_global_id(issue_id)
+    Gitlab::ErrorTracking::DetailedError.new(id: issue_id).to_global_id.to_s
+  end
+end

spec/graphql/types/error_tracking/sentry_detailed_error_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GitlabSchema.types['SentryDetailedError'] do
+  it { expect(described_class.graphql_name).to eq('SentryDetailedError') }
+
+  it { expect(described_class).to require_graphql_authorizations(:read_sentry_issue) }
+
+  it 'exposes the expected fields' do
+    expected_fields = %i[
+      id
+      sentryId
+      title
+      type
+      userCount
+      count
+      firstSeen
+      lastSeen
+      message
+      culprit
+      externalUrl
+      sentryProjectId
+      sentryProjectName
+      sentryProjectSlug
+      shortId
+      status
+      frequency
+      firstReleaseLastCommit
+      lastReleaseLastCommit
+      firstReleaseShortVersion
+      lastReleaseShortVersion
+    ]
+
+    is_expected.to have_graphql_fields(*expected_fields)
+  end
+end

spec/graphql/types/project_type_spec.rb

@@ -22,8 +22,7 @@ describe GitlabSchema.types['Project'] do
       only_allow_merge_if_pipeline_succeeds request_access_enabled
       only_allow_merge_if_all_discussions_are_resolved printing_merge_request_link_enabled
       namespace group statistics repository merge_requests merge_request issues
-      issue pipelines
-      removeSourceBranchAfterMerge
+      issue pipelines removeSourceBranchAfterMerge sentryDetailedError
     ]
 
     is_expected.to have_graphql_fields(*expected_fields)

spec/presenters/sentry_detailed_error_presenter_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe SentryDetailedErrorPresenter do
+  let(:error) { build(:detailed_error_tracking_error) }
+  let(:presenter) { described_class.new(error) }
+
+  describe '#frequency' do
+    subject { presenter.frequency }
+
+    it 'returns an array of frequency structs' do
+      expect(subject).to include(a_kind_of(SentryDetailedErrorPresenter::FrequencyStruct))
+    end
+
+    it 'converts the times into UTC time objects' do
+      time = subject.first.time
+
+      expect(time).to be_a(Time)
+      expect(time.strftime('%z')).to eq '+0000'
+    end
+
+    it 'returns the correct counts' do
+      count = subject.first.count
+
+      expect(count).to eq error.frequency.first[1]
+    end
+  end
+end

spec/requests/api/graphql/project/error_tracking/sentry_detailed_error_request_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+describe 'getting a detailed sentry error' do
+  include GraphqlHelpers
+
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:project_setting) { create(:project_error_tracking_setting, project: project) }
+  let_it_be(:current_user) { project.owner }
+  let_it_be(:sentry_detailed_error) { build(:detailed_error_tracking_error) }
+  let(:sentry_gid) { sentry_detailed_error.to_global_id.to_s }
+  let(:fields) do
+    <<~QUERY
+      #{all_graphql_fields_for('SentryDetailedError'.classify)}
+    QUERY
+  end
+
+  let(:query) do
+    graphql_query_for(
+      'project',
+      { 'fullPath' => project.full_path },
+      query_graphql_field('sentryDetailedError', { id: sentry_gid }, fields)
+    )
+  end
+
+  let(:error_data) { graphql_data['project']['sentryDetailedError'] }
+
+  it_behaves_like 'a working graphql query' do
+    before do
+      post_graphql(query, current_user: current_user)
+    end
+  end
+
+  context 'when data is loading via reactive cache' do
+    before do
+      post_graphql(query, current_user: current_user)
+    end
+
+    it "is expected to return an empty error" do
+      expect(error_data).to eq nil
+    end
+  end
+
+  context 'reactive cache returns data' do
+    before do
+      expect_any_instance_of(ErrorTracking::ProjectErrorTrackingSetting)
+        .to receive(:issue_details)
+        .and_return({ issue: sentry_detailed_error })
+
+      post_graphql(query, current_user: current_user)
+    end
+
+    it "is expected to return a valid error" do
+      expect(error_data['id']).to eql sentry_gid
+      expect(error_data['sentryId']).to eql sentry_detailed_error.id.to_s
+      expect(error_data['status']).to eql sentry_detailed_error.status.upcase
+      expect(error_data['firstSeen']).to eql sentry_detailed_error.first_seen
+      expect(error_data['lastSeen']).to eql sentry_detailed_error.last_seen
+    end
+
+    it 'is expected to return the frequency correctly' do
+      expect(error_data['frequency'].count).to eql sentry_detailed_error.frequency.count
+
+      first_frequency = error_data['frequency'].first
+      expect(Time.parse(first_frequency['time'])).to eql Time.at(sentry_detailed_error.frequency[0][0], in: 0)
+      expect(first_frequency['count']).to eql sentry_detailed_error.frequency[0][1]
+    end
+  end
+end