Orchestrator Diagnostic Logs

These are diagnostic logs generated by UiPath Orchestrator regarding its behavior.

Enabling UiPath Orchestrator Diagnostic Logs

The UiPath Orchestrator Diagnostic Logs are enabled once UiPath Orchestrator is successfully installed. They rely on the NLog infrastructure and their configuration can be found in the UiPath.Orchestrator.dll.config file, under the <nlog> tag.

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Note

Please keep in mind that both server exceptions from Orchestrator, and the stack trace on the Job Details window, are logged in English, regardless of what language was chosen by the user.

Targets of the UiPath Orchestrator Diagnostic Logs

All application logs are logged to the Event Viewer at the minimum logging level of Information. This is specified by the following lines in the UiPath.Orchestrator.dll.config file:
<target xsi:type="EventLog" name="eventLog" layout="${message}" source="Orchestrator" log="Application" />
<logger name="*" minlevel="Info" writeTo="eventLog" />

Logs generated by business and other validation rules have a separate target and logger:
<target xsi:type="EventLog" name="businessExceptionEventLog" layout="${message}${onexception:${exception:format=tostring:maxInnerExceptionLevel=5:innerFormat=tostring}}" source="Orchestrator.BusinessException" log="Application" />
<logger name="BusinessException.*" minlevel="Info" writeTo="businessExceptionEventLog" final="true" />
These types of error messages are logged in the Event Viewer in the following cases:

• validation issues such as:
  • Invalid username/email address or password.
  • The machine name DOC is already taken
• business conflicts such as:
  • License expired!
  • The floating robot's session is already active on machine ROQADOCS06!
  • The robots already have pending jobs for this Process.
• not found exceptions such as:
  • QueueName1 does not exist.

Orchestrator Execution Logs

The Orchestrator Execution Logs are sent by the Robots connected to it and are displayed in the Logs section of the Jobs or Robots pages. The application receives the data from the Robots, adds its own parameters (TenantID, FolderID, and forwards the messages to different targets, as specified in the <nlog> section from the UiPath.Orchestrator.dll.config file.

Targets of the Orchestrator Execution Logs

By default, all Robot logs are sent to the Logs table of the Default Orchestrator Database, where UiPath Orchestrator stores other information, but the UiPath.Orchestrator.dll.config file can be configured to send them to a different Database as well.

The Logs page displays information from the Logs table of the Default Database. So, if this section does not exist, or the logs are saved to a different database, the page is empty. All parameters should be according to the table schema, which looks like this:

<target xsi:type="Database" name="database" connectionString="${ui-connection-strings:item=Default}" keepConnection="true">
 <commandText>
  insert into dbo.Logs (OrganizationUnitId, TenantId, TimeStamp, Level, WindowsIdentity, ProcessName, JobKey, Message, RawMessage)
  values (@organizationUnitId, @tenantId, @timeStamp, @level, @windowsIdentity, @processName, @jobId, @message, @rawMessage)
 </commandText>
  <parameter name="@organizationUnitId" layout="${event-properties:item=organizationUnitId}" />
  <parameter name="@tenantId" layout="${event-properties:item=tenantId}" />
  <parameter name="@timeStamp" layout="${date}" />
  <parameter name="@level" layout="${event-properties:item=levelOrdinal}" />
  <parameter name="@windowsIdentity" layout="${event-properties:item=windowsIdentity}" />
  <parameter name="@processName" layout="${event-properties:item=processName}" />
  <parameter name="@jobId" layout="${event-properties:item=jobId}" />
  <parameter name="@message" layout="${message}" />
  <parameter name="@rawMessage" layout="${event-properties:item=rawMessage}" />
</target>
 <logger name="Robot.*" writeTo="database" final="true" />

Other targets can be added to the logs by configuring the UiPath.Orchestrator.dll.config file. A list of available targets can be found here.

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Nlog target reset

When upgrading Orchestrator, Nlog targets are deleted and recreated, as follows:

• Upon upgrade to 2022.4, Nlog database targets are reverted to their default values.
• Upon upgrade to 2022.10, Nlog database targets are deleted and replaced with new and improved targets.

This covers database, monitoring, and insightsRobotLogs targets.

If the number of Robot logs stored in the table is higher than 1 million, we recommend creating the following index for improved search performance:

CREATE NONCLUSTERED INDEX [IX_Search] ON [dbo].[Logs]
(
[TenantId] ASC,
[OrganizationUnitId] ASC,
[Level] ASC,
[TimeStamp] DESC
)WITH (STATISTICS_NORECOMPUTE = OFF, DROP_EXISTING = OFF, ONLINE = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
GO

Elasticsearch Server

By default, there’s an Elasticsearch target configured from the installation script. The index is different for each tenant, but this can be configured from the specified target in the <nlog> section.

For Elasticsearch versions lower than 8.0:

<target name="robotElasticBuffer" xsi:type="BufferingWrapper" flushTimeout="5000">
<target xsi:type="ElasticSearch" name="robotElastic" uri="uritoelasticsearchnode" index="${event-properties:item=indexName}-${date:format=yyyy.MM}" documentType="logEvent" includeAllProperties="true" layout="${message}" excludedProperties="agentSessionId,tenantId,organizationId,indexName" />
</target>
</target>

For Elasticsearch versions 8.0 and higher:

<target name="robotElasticBuffer" xsi:type="BufferingWrapper" flushTimeout="5000">
<target xsi:type="ElasticSearch" name="robotElastic" uri="uritoelasticsearchnode" index="${event-properties:item=indexName}-${date:format=yyyy.MM}" documentType="" enableApiVersioningHeader="true" includeAllProperties="true" layout="${message}" excludedProperties="agentSessionId,tenantId,organizationId,indexName" />
</target>
</target>

In order for Elasticsearch versions 8.0 and higher to work properly, these parameters are set as follows:

• documentType is empty.
• enableApiVersioningHeader is set to true.

Elasticsearch versions previous to 7.16.3

While Elasticsearch version 7.16.3 is preferred, you can choose to use an earlier version by setting the disableProductCheckStatus parameter to true in the Nlog target (<target xsi:type="ElasticSearch").
This parameter is hidden, and its default value is false.

X-PACK Authentication

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Note:

By default, the Elasticsearch security features are disabled if you have a basic or trial license. We strongly recommend that you enable them.

Username-and-password authentication

To enable authentication via a username and password, you need to take the following steps:

1. Configure the Elasticsearch server as follows:
   • Add the xpack.security.enabled setting to the elasticsearch.yml configuration file.
   • Set up a username and password.
     For more details on this, see the Elasticsearch documentation.
2. Configure Orchestrator's UiPath.Orchestrator.dll.config file as follows:

• Option 1: If you do not use an NLog target, you need to configure the following parameters: Logs.Elasticsearch.Username and Logs.Elasticsearch.Password. Make sure their values match the Elasticsearch settings from Step 1.

• Option 2: If Logs.RobotLogs.ReadTarget is set to an NLog target (for example, robotElasticBuffer), and the Logs.Elasticsearch.Nodes setting is not specified, configure the target by adding the following: requireAuth="true" username="XPACKuser" password="p@$$w0rd". Make sure these parameter values match the Elasticsearch settings from Step 1.
  For more on these parameters, see the UiPath.Orchestrator.dll.config page.
  For a configuration example, see the following:

<target name="robotElasticBuffer" xsi:type="BufferingWrapper" flushTimeout="5000">
        <target xsi:type="ElasticSearch" name="robotElastic" uri="" requireAuth="true" username="XPACKusername" password="p@$$w0rd" index="${event-properties:item=indexName}-${date:format=yyyy.MM}" documentType="logEvent" includeAllProperties="true" layout="${message}" excludedProperties="agentSessionId,tenantId,indexName" />
      </target>

• Option 3: If Logs.RobotLogs.ReadTarget is set to an NLog target ( for example, robotElasticBuffer), and an Elasticsearch node is specified via the Logs.Elasticsearch.Nodes setting, you need to explicitly configure it (as it overrides the NLog target settings), and make sure to also add the following: requireAuth="true" username="XPACKuser" password="p@$$w0rd". Make sure these parameter values match the Elasticsearch settings from Step 1.

OAuth2 authentication

To switch to OAuth2 as an authentication method for Elasticsearch, you need to take the following steps. Note that you need to provide your current credentials to switch to this token-based authentication method.

1. Configure the Elasticsearch server as follows:
   a. Enable TLS (HTTPS) for the transport layer.
   b. Update the following settings in the elasticsearch.yml configuration file:
   • xpack.security.authc.token.enabled: true
   • xpack.security.enabled: true
   • xpack.security.authc.token.timeout - This settings is optional and controls for how long a token is valid. By default, its value is set to 20 minutes.
     For more details on this, see the Elasticsearch documentation.
2. Update the following parameters in Orchestrator's UiPath.Orchestrator.dll.config file to reflect the settings you opted for at Step 1.
   • Logs.Elasticsearch.TlsEnabled = ”true” - By default, this parameter is set to true and ensures TLC (HTTPS) is enabled.
   • Logs.Elasticsearch.OAuthEnabled = ”true” - By default, this parameter is set to false. For more on this, see Logs.Elasticsearch.OAuthEnabled.
   • Logs.Elasticsearch.OAuthExpireInSeconds = ”1200” - This parameter is optional unless the default value of 1200 is changed in the Elasticsearch xpack.security.authc.token.timeout setting. This parameter must have the same value as in the Elasticsearch configuration. For more on this, see Logs.Elasticsearch.OAuthExpireInSeconds.

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Note:

The first two steps help you configure a token-based authentication mechanism for reading logs. If you use NLog, an additional step is needed.

3. To enable OAuth2 for Nlog, make sure to also configure the following parameter in Orchestrator's UiPath.Orchestrator.dll.config file. Note that you must fill in the username and password for authentication in Elasticsearch because the initial token is generated based on those credentials.
   • OAuthEnabled = “true” - By default, it is set to false. For more on this, see the UiPath.Orchestrator.dll.config page.

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Important

If Logs.RobotLogs.ReadTarget is set to an NLog target (for example, robotElasticBuffer), and the Logs.Elasticsearch.Nodes setting is not specified, then the Logs.Elasticsearch.OAuthEnabled is filled from the NLog target configuration. Same logic is applied for username and password.