Product Analytics / Metrics for Pro

[Sancus]

Objective

Support the Earlybird/Community rollout by instrumenting Thunderbird Pro services with privacy-respecting usage metrics, so we can answer one question per service: are people actually using it? Success is a single PostHog dashboard that gives a daily bird's-eye view of Pro health across all services.

🟢 In Scope

• Aggregate daily snapshot metrics (subscription counts, waitlist, mail provisioning)
• Per-user activity signals (boolean flags and byte counts only — no message content, filenames, or calendar details)
• PostHog event emission following existing telemetry.capture() patterns
• Instrumentation changes in Appointment and Send services
• Dashboard configuration in PostHog with escalation alerts

🔴 Out of Scope

• Reading or indexing email/file/calendar content
• Building custom analytics UI inside the accounts app

Technical and/or Business Requirements

• All distinct_id values must be SHA-256 hashed; no raw UUIDs or emails reach PostHog
• All collection gated behind POSTHOG_API_KEY — zero events without it
• Test accounts excluded from all counts

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Proposed Metrics

Pro General

Metric	Source	Cadence
Total active (paying) subscribers	Subscription model, status=active	Daily
Remaining waitlist users	AllowListEntry where user is null	Daily
Waitlist conversion rate	Converted / total AllowListEntry	Daily

Thundermail

Metric	Source	Cadence
Quota usage per user (bytes + %)	Stalwart API usedQuota	Daily
Users at storage extremes (<1%, >90%)	Derived from quota data	Daily
Active mail accounts provisioned	Account model, active=True	Daily
Email sending activity	Stalwart metrics/logs	Daily
Email reading activity	Stalwart JMAP/IMAP session data	Daily
Connected device / sync count	Stalwart active sessions	Daily

Appointment

Metric	Source	Cadence
Weekly active users (page views)	Appointment service	Per-event
% of users with availability configured	Appointment service	Daily
Bookings created by clients	Appointment service	Per-event
% of users receiving bookings	Appointment service	Weekly

Send

Metric	Source	Cadence
MAU / WAU	Send service	Per-event
Median storage usage	Send service	Daily
Users at storage extremes	Send service	Daily
File downloads by recipients	Send service	Per-event
Files reported (abuse)	Send service	Per-event

Accounts

Metric	Source	Cadence
Dashboard WAU	accounts.login events (already tracked)	Derived
Login frequency	accounts.login events (already tracked)	Derived
Login errors	accounts.login_error events (already tracked)	Derived