private async Task <bool> InspectExistingAlarm(string alarmName,
double thresholdInUnits, int periodSeconds, string targetTopic)
{
var existingAlarm = await _alarmFinder.FindAlarmByName(alarmName);
if (existingAlarm == null)
{
_logger.Info($"Table alarm {alarmName} does not already exist. Creating it at threshold {thresholdInUnits}");
return(true);
}
if (!MetricAlarmHelper.AlarmActionsEqualsTarget(existingAlarm.AlarmActions, targetTopic))
{
_logger.Info($"Index alarm {alarmName} alarm target has changed to {targetTopic}");
return(true);
}
if (!MetricAlarmHelper.AlarmAndOkActionsAreEqual(existingAlarm))
{
_logger.Info($"Index alarm {alarmName} alarm actions does not match ok actions");
return(true);
}
if (AlarmThresholds.AreEqual(existingAlarm.Threshold, thresholdInUnits) && (existingAlarm.Period == periodSeconds))
{
_logger.Detail($"Table alarm {alarmName} already exists at same threshold {existingAlarm.Threshold}");
return(false);
}
LogDifferences(existingAlarm, alarmName, thresholdInUnits, periodSeconds);
return(true);
}
private void LogDifferences(MetricAlarm existingAlarm, string alarmName, double thresholdInUnits, int periodSeconds)
{
if (existingAlarm.Period != periodSeconds)
{
_logger.Info($"Table alarm {alarmName} period has changed from {existingAlarm.Period} to {periodSeconds}");
}
if (AlarmThresholds.AreEqual(existingAlarm.Threshold, thresholdInUnits))
{
return;
}
if (existingAlarm.Threshold < thresholdInUnits)
{
_logger.Info($"Table alarm {alarmName} already exists at lower threshold {existingAlarm.Threshold}. Will increase to {thresholdInUnits}");
}
else
{
_logger.Info($"Table alarm {alarmName} already exists at higher threshold {existingAlarm.Threshold}. Will decrease to {thresholdInUnits}");
}
}