spring-ai-playground

title: Logs description: Live log search with structured MDC extraction - user, session, conv, msg, traceId, spanId are injected into every line, anchoring each log to the trace it came from.

Logs

Logs dashboard - log viewer with filters in header (Level dropdown, Contains / Regex text field, Aa-insensitive checkbox, Regex checkbox, Follow tail checkbox, Export visible button), and a virtualised log tail showing monospace lines with timestamps, levels, logger names, MDC keys and message text

Logs tab - each line carries the MDC keys injected by the Logback pattern (user, sid, conv, msg, traceId, spanId), forming the bridge between log search and trace drill-down.

Purpose - live log search with structured MDC extraction. The Logback pattern injects user, sid, conv, msg, traceId, spanId MDC keys into every line emitted during a chat turn, so a log line is always anchored to the trace it came from.

When to look here

“Something errored - give me the actual stack trace” - Level filter ERROR + text search.
“Which lines belong to trace 0e9b1a980c1d?” - Text search the trace ID.
“Show only Spring AI subsystem output” - Text search spring.ai. or filter by logger pattern.
“I want to see the full pattern of one conversation” - Search the conversation ID.

Data source

Live tail of the application’s rolling log (the same stream the file appender writes). Up to 4 MB of recent lines is loaded; older lines are off-screen.

Controls

Level dropdown - ALL, ERROR, WARN, INFO, DEBUG, TRACE
Session dropdown - filter to one session (options populated from the visible lines)
Contains / Regex text field - substring or regex match
Aa-insensitive checkbox - case insensitivity toggle
Regex checkbox - interpret the filter as regex
Follow tail checkbox - auto-scroll to newest line on each refresh (disabled when custom time range set)
Export visible button - download the filtered visible lines as .log
Time-window preset (see Observability global settings) plus a custom From / To range in the settings drawer (custom range disables auto-refresh + follow-tail)

Log line structure

The Logback pattern emits each line with this shape:

2026-05-22 00:21:01.618 [reactor-http-...] INFO  o.s.p.s.chat.ChatService [user= sid= conv=Chat-6af5b06e msg=4f37... traceId=0e9b1a980c1d spanId=d23f...] - generated user message id 4f37...

The Logs tab parses each line into: time · level · logger · user · session · conv · msg · traceId · spanId · message. Row colour:

ERROR rows - red tint
WARN rows - orange tint
All others - dark-theme console row (background #1e1f24)

Drilldown - Log line dialog

Double-click any row to open the Log line dialog - single-click leaves the text selectable, so you can drag across lines to copy them without a dialog interrupting. The header shows the line’s level and timestamp; the body lists the MDC fields parsed from the line - Logger, User, Session, Conv, UserMessageId, TraceId, SpanId (each rendered as - when the line did not carry that key) - followed by the full raw line in a scrollable block.

Log line dialog - header reading Log line - INFO and the timestamp, a field list (Logger, User, Session, Conv, UserMessageId, TraceId, SpanId), the full raw line in a monospace block, and a footer with Copy raw line, Open trace, and Close buttons { width=”900” }

The footer carries these actions:

Copy raw line - copies the unparsed line to the clipboard.
Open trace - navigates to the Traces tab filtered by this line’s traceId, the bridge from a single log line to the full span tree of the request that produced it. If the line has no traceId, it reports that instead.
Open in chat - shown when the line carries a conv; opens that conversation thread.
Close - dismisses the dialog.

Cross-references

Traces - drill from log row → trace by traceId
Observability Architecture → Log correlation - Logback pattern reference

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