Alerts
pgDash Alerts allows you to quickly set smart alerts for your database. Here is an overview the alerts that are available:

Server Level

At the server-level (or more correctly at the database cluster level), you can set alerts for:
    Transaction ID range getting closer to 2 billion
    Time since last checkpoint
    Replication: number of inactive replication slots
    Replication at primaries: write/flush/replay lag in bytes
    Replication at standbys: replay lag in units of bytes
    Replication at standbys: replay lag in units of time
    WAL files: number of wal files in pg_wal (earlier pg_xlog) directory
    WAL archiving: number of wal files ready for archiving
    Number of backends waiting for locks
    Number of backends idling in transaction
    Number of backends with transactions open for more than a certain time
Here is the UI to set server-level alerts. You can add the new rule either as a warning or a critical severity alert
Setting server-level alerts

Database Level

At database-level, you can set these alerts:
    Number of backends, as an absolute number
    Number of backends, as a percentage of the maximum connections allowed to the database
    Commit ratio, as a percentage
    Transaction ID age (value of age(datfrozenxid)) as as a percentage of autovacuum_freeze_max_age setting (usually 2 billion)
    Database size
    Count of disabled triggers
    Cache hit ratio, as a percentage
You can choose which databases to apply the rule to. You can either apply the to rule to all databases, or restrict to databases whose name contains/does not contain/starts with/ends with/is exactly a certain texts
Setting database-level alerts

Table Level

Table-level alerts include size and bloat. The full list is:
    The time since the last auto/manual vacuum/analyze happened
    The size of the table in units of bytes
    The bloat, in units of bytes
    The bloat, as a percentage of the table size
The tables the rule applies to can be chosen like with database-level rules. Additionally, you can also restrict the rule to all the tables within a certain database
Setting table-level alerts

Tablespace Level

Disk space rules are set at the tablespace level.
    The size of the tablespace, in units of bytes.
    The free disk space, as a percentage of the total disk space.
    The free inode count, as a percentage of the total available inode count.

Alerting Status

Alerting rules are evaluated whenever you send in a pgmetrics report. These are displayed in the UI, and can also be sent out as email notifications. Here is the full UI, with a few triggered alerts:
pgDash Alert UI

Notifications

Alerts can be notified via email, to one or more email addresses. They can also be sent out to Slack channels. PagerDuty events can also be triggered. You can also create alerts in VictorOps. Here is a what an email looks like:
pgDash Alert Email
Last modified 2yr ago
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