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# 3 Overview
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#### Overview
The *Monitoring → Overview* section offers an overview of trigger states
or a comparison of data for various hosts at once.
The following display options are available:
- select all hosts or specific host groups in the *Group* dropdown
- choose what type of information to display (triggers or data) in the
*Type* dropdown
- select horizontal or vertical display of information in the *Hosts
location* dropdown
**Overview of triggers**
In the next screenshot Triggers are selected in the *Type* dropdown. As
a result, trigger states of two local hosts are displayed, as coloured
blocks (the colour depending on the state of the trigger):
{width="600"}
Note that recent trigger changes (within the last 30 minutes) will be
displayed as blinking blocks.
Blue up and down arrows indicate triggers that have dependencies. On
mouseover, dependency details are revealed.
Clicking on a trigger block provides links to trigger events,
configuration, the acknowledgement screen, URL or a simple graph/latest
values list.
**Overview of data**
In the next screenshot Data is selected in the *Type* dropdown. As a
result, performance item data of two local hosts are displayed.
{width="600"}
Only values that fall within the last 24 hours are displayed by default.
This limit has been introduced with the aim of improving initial loading
times for large pages of latest data. It is also possible to change this
limitation by changing the value of ZBX\_HISTORY\_PERIOD
[constant](/fr/manual/web_interface/definitions) in
*include/defines.inc.php*.
Clicking on a piece of data offers links to some predefined graphs or
latest values.
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#### Overview of triggers
In the next screenshot *Trigger overview* is selected. As a result, the
trigger states of a local host are displayed as colored blocks (the
color of problem triggers depends on the problem severity color, which
can be adjusted in the [problem
update](/manual/acknowledges#updating_problems) screen):
{width="600"}
Note that recent trigger changes (within the last 2 minutes) will be
displayed as blinking blocks.
Blue up and down arrows indicate triggers that have dependencies. On
mouseover, dependency details are revealed.
A checkbox icon indicates acknowledged problems. All problems or
resolved problems of the trigger must be acknowledged for this icon to
be displayed.
Clicking on a trigger block provides context-dependent links to problem
events of the trigger, the problem acknowledgment screen, trigger
configuration, trigger URL or a simple graph/latest values list.
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##### Buttons
Button to the right offers the following option:
| | |
|---|---|
||Additional information on the page content is displayed if you roll the mouse over this button.|
View mode buttons being common for all sections are described on the
[Monitoring](/manual/web_interface/frontend_sections/monitoring#view_mode_buttons)
page.
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##### Using filter
You can use the filter to display only the problems you are interested
in. For better search performance, data is searched with macros
unresolved.
The filter is located above the table.
{width="600"}
|Parameter|Description|
|---------|-----------|
|*Show*|Filter by problem status:
**Recent problems** - unresolved and recently resolved problems are displayed (default)
**Problems** - unresolved problems are displayed
**Any** - history of all events is displayed|
|*Host groups*|Filter by host group.|
|*Hosts*|Filter by host.|
|*Name*|Filter by problem name.|
|*Minimum severity*|Filter by minimum problem severity.|
|*Age (less than)*|Mark the checkbox to filter by problem age.|
|*Host inventory*|Filter by inventory type and value.|
|*Tags*|Specify tags to limit the number of problems displayed in the widget. It is possible to include as well as exclude specific tags and tag values. Several conditions can be set. Tag name matching is always case-sensitive.
There are several operators available for each condition:
**Exists** - include the specified tag names
**Equals** - include the specified tag names and values (case-sensitive)
**Contains** - include the specified tag names where the tag values contain the entered string (substring match, case-insensitive)
**Does not exist** - exclude the specified tag names
**Does not equal** - exclude the specified tag names and values (case-sensitive)
**Does not contain** - exclude the specified tag names where the tag values contain the entered string (substring match, case-insensitive)
There are two calculation types for conditions:
**And/Or** - all conditions must be met, conditions having the same tag name will be grouped by the Or condition
**Or** - enough if one condition is met|
|*Show unacknowledged only*|Mark the checkbox to only display problems which are unacknowledged.|
|*Show suppressed problems*|Mark the checkbox to display problems which would otherwise be suppressed (not shown) because of host maintenance.|
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#### Overview of data
In the next screenshot *Data overview* is selected. As a result, item
data of a local host is displayed.
{width="600"}
The color of problem items is based on the problem severity color, which
can be adjusted in the [problem
update](/manual/acknowledges#updating_problems) screen.
By default, only values that fall within the last 24 hours are
displayed. This limit has been introduced with the aim of improving
initial loading times for large pages of latest data. You can extend
this time period by changing the value of *Max history display period*
parameter in the
*[Administration→General](/manual/web_interface/frontend_sections/administration/general#gui)*
menu section.
Clicking on a piece of data offers links to some predefined graphs or
latest values.
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##### Using filter
You can use the filter to display only the data you are interested in.
For better search performance, data is searched with macros unresolved.
The filter is located above the table.
{width="600"}
|Parameter|Description|
|---------|-----------|
|*Host groups*|Filter by host group.|
|*Hosts*|Filter by host.|
|*Tags*|Specify item tags to limit the number of items displayed in the widget. It is possible to include as well as exclude specific tags and tag values. Several conditions can be set. Tag name matching is always case-sensitive.
There are several operators available for each condition:
**Exists** - include the specified tag names
**Equals** - include the specified tag names and values (case-sensitive)
**Contains** - include the specified tag names where the tag values contain the entered string (substring match, case-insensitive)
**Does not exist** - exclude the specified tag names
**Does not equal** - exclude the specified tag names and values (case-sensitive)
**Does not contain** - exclude the specified tag names where the tag values contain the entered string (substring match, case-insensitive)
There are two calculation types for conditions:
**And/Or** - all conditions must be met, conditions having the same tag name will be grouped by the Or condition
**Or** - enough if one condition is met|
|*Show suppressed problems*|Mark the checkbox to display problems which would otherwise be suppressed (not shown) because of host maintenance.|
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