Core team - Pulse #13 of 2026
The Team
- @sed-i
- @lucabello
- @jose-masson
- @crucible
- @sinap
We are part of the Observability team, alongside Tracing and Service Mesh.
The Work
Preparing for our release
feat: Rolled out the charms blueprint across the observability portfolio- feat: Added a
baseTerraform input variable across the entire charm portfolio so operators can pin the OS base per application - feat: Added the Sigma rules infrastructure across our libraries: charmlibs, cos-lib, plus a refactor of Rules helpers into free functions: cos-lib
- feat: TLS-aware NginxPrometheusExporter (breaking) and a codeowners bump for the nginx-k8s library: charmlibs, charmlibs
- feat: Added icons and prepared metadata so the charms are ready for public listing on Charmhub: blackbox-exporter-k8s, blackbox-exporter-k8s, blackbox-exporter-k8s, blackbox-exporter, blackbox-exporter, mimir, mimir, mimir, mimir, mimir, mimir, loki, loki, opentelemetry-collector-integrator
- feat: Improved COS Lite QA — new SQA tests on prod infra, an Otelcol dashboard integration, TF checks, a PR template update, and a Grafana database with docs: observability-stack, observability-stack, observability-stack, observability-stack, observability-stack, opentelemetry-collector-k8s
- feat: Added Juju secrets support for sensitive Grafana custom config fields: grafana-k8s
- feat: Added a queue to all OpenTelemetry Collector exporters to improve resilience: opentelemetry-collector-k8s, opentelemetry-collector
fix: Added timeInterval to the grafana-source relation extra fields so scrape-aligned queries work correctly: mimir, mimir- fix: Added Terraform track/channel name validation across the charm portfolio to catch bad channels early: grafana-k8s, catalogue-k8s, opentelemetry-collector-k8s, k6-k8s, blackbox-exporter-k8s, loki-k8s, prometheus-k8s, tempo, loki, mimir, alertmanager-k8s
- fix: Stopped continuous databag churn on the grafana-dashboard relation: opentelemetry-collector, opentelemetry-collector, opentelemetry-collector-k8s, opentelemetry-collector-k8s, grafana-k8s
- fix: Sorted peer names in prometheus_remote_write to eliminate duplicated alerts, and bumped the library where used: prometheus-k8s, opentelemetry-collector, opentelemetry-collector, opentelemetry-collector-k8s, opentelemetry-collector-k8s
- fix: Resolved constant Alertmanager service restarts: alertmanager-k8s, alertmanager-k8s
- fix: Repaired mimirtool TLS failures, stale hash on exec errors, and missing leader guard, and updated write endpoints: mimir, mimir, mimir
- fix: Coordinators no longer reconcile on pebble-check-failed/recovered events, and TLS/private-key handling has been tightened: cos-coordinated-workers, cos-coordinated-workers, cos-coordinated-workers, cos-coordinated-workers, charmlibs
- fix: Mimir now reconciles when ingress is revoked, Loki only requests checksum validation when needed, and coordinated workers have been bumped across the stack: mimir, loki, tempo, loki, tempo, loki, mimir, cos-coordinated-workers
- fix: Added the Istio beacon to worker libs so coordinators integrate with Service Mesh: mimir, loki
- fix: Loki blocks on invalid rules in relation data and now exposes the ruler API for syncing alerts (backport): loki, loki
- fix: Excluded juju_charm from alert rule expressions to avoid false labelling: loki-k8s
- fix: OTel Collector snap now applies path_exclude to log jobs and restarts when trusted CAs change on disk: opentelemetry-collector, opentelemetry-collector, opentelemetry-collector
- fix: Deployed Grafana from a real revision in Tempo integration tests, fixed COS model usage and versions map in the deployment pipelines, and updated the default base to 26.04 in the stack: tempo, terragrunt-deployment-pipelines, terragrunt-deployment-pipelines, observability-stack
chore: Upgraded grafana_source library to v1 for stable datasource UIDs across coordinators and charms: prometheus-k8s, parca-k8s, pyroscope, loki-k8s, alertmanager-k8s, tempo, loki, mimir
refactor: Cleaned up OTel Collector rules and dashboards, and moved product-API base input handling: opentelemetry-collector-k8s, opentelemetry-collector-k8s, observability-stack, observability-stack
Others: we kept improving our documentation and onboarding materials.
docs: Migrated cos-config and blackbox-exporter docs from Discourse into the observability-stack repo: observability-stack, observability-stack- docs: Wrote a new onboarding guide for Service Mesh: observability-team
Feedback welcome
As always, feedback is very welcome! Feel free to let us know your thoughts, questions, or suggestions either here or on our Matrix channel.
That’s all for this time! See you again in two weeks!