Primary Server: 5.0-2 errata382
Replica Directory Node with Dashboard installed: 5.0-2 errata382

Dashboard Database: 2.35.0-4 installed

After a fresh install of the dashboard, the database app does not start, reporting several errors loading rules. For example:

level=error component="rule manager" msg="loading groups failed" err="/etc/prometheus/alert_UNIVENTION_SLAPD_MDB_MAXSIZE_METRIC_MISSING.yml: 8:11: group \"UNIVENTION_SLAPD_MDB_MAXSIZE_METRIC_MISSING\", rule 1, \"UNIVENTION_SLAPD_MDB_MAXSIZE_METRIC_MISSING\": could not parse expression: 1:45: parse error: unexpected character inside braces: '%'"

This is caused by the fact that the variable %instance% from the definition (or any other variable for that matter) has not been replaced in the config files.

Example, causing error:

groups:
- name: UNIVENTION_SLAPD_MDB_MAXSIZE_METRIC_MISSING
  rules:
  - alert: UNIVENTION_SLAPD_MDB_MAXSIZE_METRIC_MISSING
    annotations:
      description: metrics regarding slapd mdb database size are missing
      title: check if metrics regarding slapd mdb database size are missing
    expr: absent(univention_slapd_mdb_size_used_ratio{%instance%}) == 1 or absent(univention_slapd_translog_mdb_size_used_ratio{%instance%})
      == 1
    for: 1m
    labels:
      severity: critical



Workaround: manually adding a key / value pair to the alert definition on the primary server triggers a rewrite of the config file and the variables including %instance% are filled in.

Result:
groups:
- name: UNIVENTION_SLAPD_MDB_MAXSIZE_METRIC_MISSING
  rules:
  - alert: UNIVENTION_SLAPD_MDB_MAXSIZE_METRIC_MISSING
    annotations:
      description: metrics regarding slapd mdb database size are missing
      title: check if metrics regarding slapd mdb database size are missing
    expr: absent(univention_slapd_mdb_size_used_ratio{instance=~"(SERVER_NAMES_CORRECTLY_INSERTED_HERE)"})
      == 1 or absent(univention_slapd_translog_mdb_size_used_ratio{instance=~"(SERVER_NAMES_CORRECTLY_INSERTED_HERE)"})
      == 1
    for: 1m
    labels:
      severity: critical