A method of monitoring for combustion anomalies in a gas turbomachine, the method comprising: sensing an exhaust gas temperature at each of a plurality of temperature sensors arranged in an exhaust system of the gas turbomachine; comparing the exhaust gas temperature at each of the plurality of temperature sensors with a mean exhaust temperature; determining whether the exhaust gas temperature at one or more of the plurality of temperature sensors deviates from the mean exhaust temperature by a predetermined threshold value; and identifying an instantaneous combustion anomaly at one or more of the plurality of temperature sensors sensing a temperature deviating from the mean exhaust temperature by more than the predetermined threshold value,the method further comprising: combining one or more of the plurality of temperature sensors into a group; and determining whether each of the one or more of the plurality of temperature sensors in the group senses a temperature deviating from the mean exhaust temperature; characterized in that the method further comprising: determining a maximum sensed temperature detected by one or more of the plurality of temperature sensors in the group, a mean sensed temperature detected by the one or more of the plurality of temperature sensors in the group, and determining an average sensed temperature detected by the one or more of the plurality of temperature sensors in the group if all of the plurality of temperature sensors in the group sense a temperature deviating from the mean exhaust temperature. sensing an exhaust gas temperature at each of a plurality of temperature sensors arranged in an exhaust system of the gas turbomachine; comparing the exhaust gas temperature at each of the plurality of temperature sensors with a mean exhaust temperature; determining whether the exhaust gas temperature at one or more of the plurality of temperature sensors deviates from the mean exhaust temperature by a predetermined threshold value; and identifying an instantaneous combustion anomaly at one or more of the plurality of temperature sensors sensing a temperature deviating from the mean exhaust temperature by more than the predetermined threshold value,the method further comprising: combining one or more of the plurality of temperature sensors into a group; and determining whether each of the one or more of the plurality of temperature sensors in the group senses a temperature deviating from the mean exhaust temperature; characterized in that the method combining one or more of the plurality of temperature sensors into a group; and determining whether each of the one or more of the plurality of temperature sensors in the group senses a temperature deviating from the mean exhaust temperature; characterized in that the method further comprising: determining a maximum sensed temperature detected by one or more of the plurality of temperature sensors in the group, a mean sensed temperature detected by the one or more of the plurality of temperature sensors in the group, and determining an average sensed temperature detected by the one or more of the plurality of temperature sensors in the group if all of the plurality of temperature sensors in the group sense a temperature deviating from the mean exhaust temperature. determining a maximum sensed temperature detected by one or more of the plurality of temperature sensors in the group, a mean sensed temperature detected by the one or more of the plurality of temperature sensors in the group, and determining an average sensed temperature detected by the one or more of the plurality of temperature sensors in the group if all of the plurality of temperature sensors in the group sense a temperature deviating from the mean exhaust temperature.