Summary

evalview monitor currently supports Slack webhooks for regression alerts. Add Discord webhook support so teams using Discord get the same experience.

Implementation

New file: evalview/core/discord_notifier.py

Follow the same pattern as evalview/core/slack_notifier.py — the interface is identical, only the payload format differs.

Discord webhook payload format:

payload = {
    "content": text,  # or use "embeds" for richer formatting
}

Config:

monitor:
  discord_webhook: https://discord.com/api/webhooks/...

CLI flag: --discord-webhook <url>

Env var fallback: EVALVIEW_DISCORD_WEBHOOK

Acceptance Criteria

• DiscordNotifier class with send_regression_alert() and send_recovery_alert()
• CLI flag --discord-webhook
• Config yaml support under monitor.discord_webhook
• Environment variable fallback
• Tests (follow tests/test_monitor.py pattern)

Helpful Context

• Look at evalview/core/slack_notifier.py — your code should mirror this
• Look at evalview/commands/monitor_cmd.py _resolve_slack_webhook() for the priority chain pattern
• Discord webhook docs: https://discord.com/developers/docs/resources/webhook