trails/infrastructure/Caddyfile
Ullrich Schäfer 5c4b6fd9af Stop the caddy-502-rate alert firing on every deploy
The journal/planner deploy in cd-apps.yml does `docker compose up -d
journal planner`, which stops the old container and starts the new
one — Caddy keeps forwarding requests during the ~10–30s gap and
returns 502s. The caddy-502-rate alert (threshold > 0 for 2m)
correctly trips, every time.

Two production changes plus a long-broken workflow detail:

- infrastructure/Caddyfile — add `lb_try_duration 30s` /
  `lb_try_interval 250ms` to the journal and planner reverse_proxy
  blocks. Caddy now holds and retries the upstream for up to 30s
  during a restart instead of 502'ing immediately. Real outages
  (upstream unreachable longer than 30s) still 502 and the alert
  still fires for those.
- infrastructure/grafana/provisioning/alerting/alerts.yml — add a
  comment documenting why caddy-502-rate stays at threshold > 0:
  with lb_try_duration in front of it, the alert no longer
  conflates "deploy in flight" with "real outage."
- .github/workflows/cd-apps.yml — fix a long-silent bug: the
  Grafana deploy-annotation step was reading
  GRAFANA_SERVICE_TOKEN from `.env`, but the secrets file we scp
  to /opt/trails-cool is named `app.env`. The token check failed
  silently and the curl was being skipped on every deploy.
  Switching to `app.env` so deploys actually annotate Grafana.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-26 11:51:13 +02:00

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Caddyfile
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{
servers {
metrics
}
admin 0.0.0.0:2019
}
(security_headers) {
header {
Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
X-Content-Type-Options "nosniff"
X-Frame-Options "DENY"
Referrer-Policy "strict-origin-when-cross-origin"
Permissions-Policy "camera=(), microphone=(), geolocation=()"
Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' blob:; worker-src 'self' blob:; style-src 'self' 'unsafe-inline'; img-src 'self' data: https://*.tile.openstreetmap.org; connect-src 'self' wss: https://*.sentry.io https://*.ingest.de.sentry.io; font-src 'self';"
}
}
(block_scanners) {
@scanners path /.env* /.git* /wp-* /wp-admin* /admin* /config.* /backup* /.aws* /.docker* /composer* /vendor* *.php *.asp
respond @scanners 403
}
{$DOMAIN:trails.cool} {
import security_headers
import block_scanners
log {
output stdout
format json
}
reverse_proxy journal:3000 {
# During an `apps` deploy the journal container is briefly down
# (~1030s) while compose swaps containers. Without these,
# Caddy returns 502 immediately and the `caddy-502-rate` alert
# trips on every deploy. With them, Caddy holds and retries
# against the upstream for up to 30s — restart becomes
# invisible to clients. A real outage longer than 30s still
# 502s and correctly trips the alert.
lb_try_duration 30s
lb_try_interval 250ms
}
}
www.{$DOMAIN:trails.cool} {
redir https://{$DOMAIN:trails.cool}{uri} permanent
}
grafana.internal.{$DOMAIN:trails.cool} {
reverse_proxy grafana:3000
}
planner.{$DOMAIN:trails.cool} {
header {
Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
X-Content-Type-Options "nosniff"
X-Frame-Options "DENY"
Referrer-Policy "strict-origin-when-cross-origin"
Permissions-Policy "camera=(), microphone=(), geolocation=()"
Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' blob:; worker-src 'self' blob:; style-src 'self' 'unsafe-inline'; img-src 'self' data: https://*.tile.openstreetmap.org; connect-src 'self' wss: https://{$DOMAIN:trails.cool} https://*.sentry.io https://*.ingest.de.sentry.io; font-src 'self';"
}
import block_scanners
log {
output stdout
format json
}
reverse_proxy planner:3001 {
# Same rationale as the journal block — see the comment there.
lb_try_duration 30s
lb_try_interval 250ms
}
}