Timeline Collector

Captures cross-collector performance timeline — a unified view of all events from all collectors in chronological order.

What It Captures

Field	Description
time	Event timestamp
reference	Reference ID linking back to the source collector's data entry
collector	Source collector class name
data	Additional event data (varies by collector)

Data Schema

Timeline events are stored as arrays:

[
    [1711878000.100, 0, "AppDevPanel\\Kernel\\Collector\\Web\\RequestCollector", []],
    [1711878000.105, 0, "AppDevPanel\\Kernel\\Collector\\LogCollector", ["level", "info"]],
    [1711878000.150, 0, "AppDevPanel\\Kernel\\Collector\\EventCollector", []],
    [1711878000.200, 1, "AppDevPanel\\Kernel\\Collector\\LogCollector", ["level", "warning"]]
]

Summary (shown in debug entry list):

{
    "timeline": {
        "total": 15
    }
}

Contract

use AppDevPanel\Kernel\Collector\TimelineCollector;

// Called by other collectors to register timeline events
$timeline->collect(
    collector: $logCollector,
    reference: 0,           // Index in the source collector's data
    'level', 'info',        // Additional context data
);

INFO

TimelineCollectorAppDevPanel\Kernel\Collector\TimelineCollectorCollects Timeline data during application lifecycle.final Kernel · class · implements SummaryCollectorInterface implements SummaryCollectorInterfaceAppDevPanel\Kernel\Collector\SummaryCollectorInterfaceSummary data collector responsibility is to collect summary data for a collector. Summary is used to display a list of previous requests and select one to display full info. Its data set is specific to the list and is reduced compared to full data collected in {@see CollectorInterface}.Kernel · interface · extends CollectorInterface. Most other collectors depend on TimelineCollectorAppDevPanel\Kernel\Collector\TimelineCollectorCollects Timeline data during application lifecycle.final Kernel · class · implements SummaryCollectorInterface to register their events on the timeline.

How It Works

The TimelineCollectorAppDevPanel\Kernel\Collector\TimelineCollectorCollects Timeline data during application lifecycle.final Kernel · class · implements SummaryCollectorInterface is a central aggregation point. Other collectors (Log, Event, Database, etc.) call $timeline->collect() when they record an event, passing themselves as the source. This creates a unified chronological view across all collectors.

Debug Panel

• Visual timeline — horizontal bar chart showing events across time
• Collector filtering — toggle visibility of specific collectors via chips
• Color coding — each collector type has a distinct color
• Time scale — auto-scaling time axis with microsecond precision
• Event count — total timeline events in sidebar badge