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Computer resources are managed by a method that includes deriving, from historical measurement information for a computer resource, values for statistical variables, and, based on the values, determining whether a behavioral pattern for the computer resource is represented in the historical measurem

Computer resources are managed by a method that includes deriving, from historical measurement information for a computer resource, values for statistical variables, and, based on the values, determining whether a behavioral pattern for the computer resource is represented in the historical measurement information.

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1. A method for use in managing computer resources, comprising:deriving values for a plurality of statistical variables from historical measurement information for a computer resource, the information associated with the same time period during a number of preceding days;based on the values, determi

1. A method for use in managing computer resources, comprising:deriving values for a plurality of statistical variables from historical measurement information for a computer resource, the information associated with the same time period during a number of preceding days;based on the values, determining whether a behavioral pattern for the computer resource is represented in the historical measurement information; andsetting an alert threshold in response to the determination about whether a behavioral pattern for the computer resource is represented in the historical measurement information, such that, if the behavioral pattern for the computer resource is represented in the historical measurement information, the alert threshold is set based on a predetermined percentile value such that a certain percentage of the statistical variables have values less than that of the percentile value. 2. The method of claim 1, wherein the plurality of statistical variables includes a mean and a standard deviation. 3. The method of claim 2, further comprising:if the value for the standard deviation satisfies a specified condition, determining that a behavioral pattern for the computer resource is represented in the historical measurement information. 4. The method of claim 3, wherein the specified condition includes a condition that requires the value for the standard deviation to be less than a specified value. 5. The method of claim 4, wherein a full range value is associated with the historical measurement information, and a fraction of the full range value serves as the specified value. 6. The method of claim 4, wherein a fraction of the mean serves as the specified value. 7. The method of claim 4, further comprising:based on the value of the mean, determining a value to serve as the specified value. 8. The method of claim 4, further comprising:based on the value of the mean, selecting, from a set of possible values, a value to serve as the specified value. 9. The method of claim 3, wherein the specified condition is adjustable by an end-user. 10. The method of claim 1, wherein on any particular day the alert threshold is in effect for a first period of the day. 11. The method of claim 1, wherein the setting of the alert threshold is also based on the value of the mean. 12. The method of claim 1, wherein the alert threshold represents a value above which an alert is warranted. 13. The method of claim 1, wherein the alert threshold represents a value below which an alert is warranted. 14. The method of claim 1, wherein the alert threshold represents a level of utilization. 15. The method of claim 1, wherein the alert threshold represents a response time. 16. The method of claim 1, further comprising:sending an alert message after the alert threshold is crossed. 17. The method of claim 1, further comprising:sending an alert message by push technology after the alert threshold is crossed. 18. The method of claim 10, further comprising:based on the historical measurement information, setting another alert threshold, wherein the other threshold is in effect during a period of the day that is different from the first period of the day. 19. The method of claim 18, further comprising:producing an illustration that indicates when the alert thresholds are in effect. 20. The method of claim 1, wherein the alert threshold is effective for a time period that is a multiple of approximately one hour. 21. The method of claim 1, further comprising:using a time value as an index to store at least some of the historical measurement information. 22. The method of claim 1, further comprising:basing the determination on a business day schedule. 23. The method of claim 1, wherein the historical measurement information includes information acquired from a network infrastructure layer. 24. The method of claim 1, wherein the historical measurement information includes information acquired from an EP services layer. 25. The method of claim 1, wherein the histori cal measurement information includes information acquired from an application layer. 26. The method of claim 1, wherein the historical measurement information includes information acquired from a computer network. 27. The method of claim 1, wherein the historical measurement information includes information pertaining to computer data traffic. 28. The method of claim 1, wherein the historical measurement information includes information acquired by use of a protocol substantially conforming to an SNMP standard. 29. The method of claim 1, wherein the historical measurement information includes information pertaining to a router interface. 30. The method of claim 1, wherein the historical measurement information includes information acquired from a packet counter. 31. The method of claim 1, wherein the historical measurement information includes information acquired by simulated use of the computer resource. 32. The method of claim 1, wherein the historical measurement information includes information acquired by actual use of the computer resource. 33. The method of claim 1, wherein the historical measurement information includes information acquired by simulated use of a Web application. 34. The method of claim 1, wherein the historical measurement information includes information pertaining to response time. 35. The method of claim 1, wherein the historical measurement information includes information acquired by use of a software agent. 36. The method of claim 1, wherein the historical measurement information includes information acquired by use of a dummy request. 37. The method of claim 1, wherein the historical measurement information includes information pertaining to a domain name server. 38. The method of claim 1, wherein the historical measurement information includes information pertaining to electronic mail. 39. The method of claim 1, wherein the time period is the same hour on each of a number of preceding days. 40. The method of claim 1, wherein the measurement samples associated with the time period are collected during the time period. 41. The method of claim 1, wherein the number of preceding days are each the same weekday of a number of preceding weeks. 42. The method of claim 1, wherein the number of preceding days are each one of a number of weekdays of a number of preceding weeks. 43. The method of claim 1, wherein the behavioral pattern comprises a signature. 44. The method of claim 1, wherein the percentile value is about the 90 th percentile. 45. Computer software, residing on a computer-readable storage medium, comprising a set of instructions for use in a computer system to cause the computer system to manage computer resources, the instructions causing the system to:derive values for a plurality of statistical variables from historical measurement information for a computer resource, the information associated with the same time period during a number of preceding days;based on the values, determine whether a behavioral pattern for the computer resource is represented in the historical measurement information;setting an alert threshold in response to the determination about whether a behavioral pattern for the computer resource is represented in the historical measurement information, such that, if the behavioral pattern for the computer resource is represented in the historical measurement information, the alert threshold is set based on a predetermined percentile value such that a certain percentage of the statistical variables have values less than that of the percentile value. 46. A computer resources management system, comprising:a deriver that derives values for a plurality of statistical variables, from historical measurement information for a computer resource, the information associated with the same time period during a number of preceding days;a determiner that, based on the values, determines whether a behavioral pattern for the computer resource is represented in the historical measureme nt information; anda setter that sets an alert threshold in response to the determination about whether the behavioral pattern for the computer resource is represented in the historical measurement information such that, if the behavioral pattern for the computer resource is represented in the historical measurement information, the alert threshold is set based on a predetermined percentile value such that a certain percentage of the statistical variables have values less than that of the percentile value. 47. The system of claim 46, wherein the plurality of statistical variables includes a mean and a standard deviation. 48. The system of claim 47, wherein if the value for the standard deviation satisfies a specified condition, determining that a behavioral pattern for the computer resources are represented in the historical measurement information. 49. The system of claim 48, wherein the specified condition includes a condition that requires the value for the standard deviation to be less than a specified value. 50. The system of claim 49, wherein a full range value is associated with the historical measurement information, and a fraction of the full range value serves as the specified value. 51. The system of claim 49, wherein a fraction of the mean serves as the specified value. 52. The system of claim 49, further comprising:based on the value of the mean, determining a value to serve as the specified value. 53. The system of claim 49, wherein a value to serve as the specified value is selected from a set of possible values based upon the value of the mean. 54. The system of claim 48, wherein the specified condition is adjustable by an end-user.