Search for	Example	Results
A single word	`cat`	Topics that contain the word "cat". You will also find its grammatical variations, such as "cats".
A phrase. You can specify that the search results contain a specific phrase.	`"cat food"` (quotation marks)	Topics that contain the literal phrase "cat food" and all its grammatical variations. Without the quotation marks, the query is equivalent to specifying an OR operator, which finds topics with one of the individual words instead of the phrase.

Search for	Operator	Example
Two or more words in the same topic	`AND` `and` `+` (plus symbol) `&` (ampersand)	`cat AND dog` `"cat food"+milk` `"cat food"&"dog food"`
Either word in a topic	`OR` `or` `\|` (pipe)	`cat OR dog` `cat \| dog`
Topics that do not contain a specific word or phrase	`NOT` `not` `!` (exclamation point)	`NOT cat` `! dog`
Topics that contain one string and do not contain another	`^` (caret)	`cat ^ mouse`
A combination of search types	`( )` parentheses	`cat + (dog \| mouse)` `cat \| dog + (! mouse)`

Operations Manager i10.62

Develop > Automate operator functions and event change detection > Event Web Service query language > History lines

History lines

History lines enable you to track changes for an event. History lines provide information about the types, names, and previous and current values of event properties that changed for a specific event. Concurrent changes are represented as a single history line. They are available in read-only mode, and are generated automatically.

Recorded property changes

Event properties that are recorded when they are changed in the form of a history line are listed in Recorded property changes. In general, the following properties are recorded for each change: property name, previous value, current value, and time of change. For details on each of these properties, see the appropriate Javadoc for the Change Type listed in the package com.hp.opr.api.ws.model.event.property.

Recorded property changes
Name	ChangeType
`annotation`	`OprAnnotationPropertyChange`
`application`	`OprStringPropertyChange`
`assigned_group`	`OprGroupPropertyChange`
`assigned_user`	`OprUserPropertyChange`
`category`	`OprStringPropertyChange`
`cause`	`OprStringPropertyChange`
`control_transfer_to`	`OprContrlTransferredToPropertyChange`
`correlation_rule`	`OprCorrelationRulePropChange`
`custom_attribute`	`OprCustomAttributePropertyChange`
`description`	`OprStringPropertyChange`
`duplicate_count`	`OprIntegerPropertyChange`
`eti_hint`	`OprStringPropertyChange`
`key`	`OprStringPropertyChange`
`key_pattern`	`OprStringPropertyChange`
`node_hint`	`OprStringPropertyChange`
`object`	`OprStringPropertyChange`
`om_service_id`	`OprStringPropertyChange`
`om_user`	`OprStringPropertyChange`
`original_data`	`OprStringPropertyChange`
`original_id`	`OprStringPropertyChange`
`priority`	`OprPriorityPropertyChange`
`related_ci_hint`	`OprStringPropertyChange`
`severity`	`OprSeverityPropertyChange`
`solution`	`OprStringPropertyChange`
`source_ci_hint`	`OprStringPropertyChange`
`state`	`OprStatePropertyChange`
`sub_category`	`OprStringPropertyChange`
`time_created`	`OprTimePropertyChange`
`time_received`	`OprTimePropertyChange`
`title`	`OprStringPropertyChange`
`type`	`OprStringPropertyChange`

Event changes list

History lines are provided for a specific event and no filtering support is provided in this web service endpoint.

The Event Changes List returns all history lines available. You can access the event changes list by calling the following URL:

https://<server.example.com>/opr-web/rest/event_changes_list

The change list can be filtered using the standard HTTP query parameters. This list is used to detect event changes as they occur.

In order to receive the history lines from a specific date, you must specify a watermark query. See Filtering by date and time: watermark for more details about watermarks and specifying date and time.

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