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-- +migrate Up
CREATE EXTENSION IF NOT EXISTS pgcrypto;
CREATE TYPE enum_alert_status as ENUM (
'triggered',
'active',
'closed'
);
CREATE TYPE enum_alert_source as ENUM (
'grafana',
'manual'
);
CREATE TYPE enum_alert_log_event as ENUM (
'created',
'reopened',
'status_changed',
'assignment_changed',
'escalated',
'closed'
);
CREATE TABLE alerts (
id BIGSERIAL PRIMARY KEY,
description TEXT NOT NULL,
service_id TEXT REFERENCES service (id) ON DELETE CASCADE,
source enum_alert_source NOT NULL DEFAULT 'manual'::enum_alert_source,
status enum_alert_status NOT NULL DEFAULT 'triggered'::enum_alert_status,
escalation_level INT NOT NULL DEFAULT 0,
last_escalation TIMESTAMP DEFAULT now()
);
CREATE TABLE alert_logs (
id BIGSERIAL PRIMARY KEY,
alert_id BIGINT REFERENCES alerts (id) ON DELETE CASCADE,
timestamp TIMESTAMP DEFAULT now(),
event enum_alert_log_event NOT NULL,
message TEXT NOT NULL
);
CREATE VIEW alert_escalation_levels AS
SELECT alerts.id AS alert_id,
count(step.id) AS levels,
((alerts.escalation_level + 1) % count(step.id)) as relative_level
FROM alerts,escalation_policy_step step,service
WHERE step.escalation_policy_id = service.escalation_policy_id
AND service.id = alerts.service_id
GROUP BY alerts.id;
INSERT INTO alerts (description, service_id, last_escalation, status)
SELECT description, service_id, created_at, 'active'::enum_alert_status FROM incident;
-- +migrate StatementBegin
CREATE OR REPLACE FUNCTION log_alert_status_changed_insert() RETURNS TRIGGER AS
$$
BEGIN
IF NEW.status = 'closed'::enum_alert_status THEN
INSERT INTO alert_logs (alert_id, event, message) VALUES (
NEW.id, 'closed'::enum_alert_log_event, 'Closed'
);
ELSIF OLD.status = 'closed'::enum_alert_status THEN
INSERT INTO alert_logs (alert_id, event, message) VALUES (
NEW.id, 'reopened'::enum_alert_log_event, 'Reopened as '||NEW.status::TEXT
);
ELSE
INSERT INTO alert_logs (alert_id, event, message) VALUES (
NEW.id, 'status_changed'::enum_alert_log_event, 'Status updated from '||OLD.status::TEXT||' to '||NEW.status::TEXT
);
END IF;
RETURN NEW;
END;
$$ LANGUAGE 'plpgsql';
-- +migrate StatementEnd
-- +migrate StatementBegin
CREATE OR REPLACE FUNCTION log_alert_creation_insert() RETURNS TRIGGER AS
$$
BEGIN
INSERT INTO alert_logs (alert_id, event, message) VALUES (
NEW.id, 'created'::enum_alert_log_event, 'Created via: '||NEW.source::TEXT
);
RETURN NEW;
END;
$$ LANGUAGE 'plpgsql';
-- +migrate StatementEnd
-- +migrate StatementBegin
CREATE OR REPLACE FUNCTION escalate_alerts() RETURNS VOID AS
$$
BEGIN
UPDATE alerts a
SET escalation_level = escalation_level + 1, last_escalation = now()
FROM service s, escalation_policy_step step, alert_escalation_levels lvl, escalation_policy e
WHERE (last_escalation + (step.delay::TEXT||' minutes')::interval) < now()
AND a.status = 'triggered'::enum_alert_status
AND s.id = a.service_id
AND step.escalation_policy_id = s.escalation_policy_id
AND lvl.alert_id = a.id
AND step.step_number = ((a.escalation_level + 1) % lvl.levels)
AND e.id = s.escalation_policy_id
AND (e.repeat = -1 OR escalation_level / lvl.levels < e.repeat);
END;
$$ LANGUAGE 'plpgsql';
-- +migrate StatementEnd
CREATE TRIGGER log_alert_status_changed
AFTER UPDATE ON alerts
FOR EACH ROW
WHEN (OLD.status IS DISTINCT FROM NEW.status)
EXECUTE PROCEDURE log_alert_status_changed_insert();
CREATE TRIGGER log_alert_creation
AFTER INSERT ON alerts
FOR EACH ROW
EXECUTE PROCEDURE log_alert_creation_insert();
-- +migrate Down
DROP VIEW alert_steps;
DROP TABLE alert_logs;
DROP TYPE enum_alert_log_event;
DROP TABLE alerts;
DROP TYPE enum_alert_source;
DROP TYPE enum_alert_status;
DROP FUNCTION log_alert_status_changed_insert();
DROP FUNCTION log_alert_creation_insert();
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