(core) remove metrics

Summary: This removes some old metric code. There's also a user preference dialog that has a single option (whether to allow metrics) this is left in place with a dummy option. It could be ripped out as well, probably.

Test Plan: existing tests pass

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D2622

app/common/GristServerAPI.ts

@@ -8,26 +8,11 @@ export interface GristServerAPI extends
   DocListAPI,
   LoginSessionAPI,
   BasketClientAPI,
-  ServerMetricsAPI,
   UserAPI,
   SharingAPI,
   MiscAPI {}
 
 
-interface ServerMetricsAPI {
-  /**
-   * Registers the list of client metric names. The calls to pushClientMetrics() send metric
-   * values as an array parallel to this list of names.
-   */
-  registerClientMetrics(clientMetricsList: string[]): Promise<void>;
-
-  /**
-   * Sends bucketed client metric data to the server. The .values arrays contain one value for
-   * each of the registered metric names, as a parallel array.
-   */
-  pushClientMetrics(clientBuckets: Array<{startTime: number, values: number[]}>): Promise<void>;
-}
-
 interface UserAPI {
   /**
    * Gets the Grist configuration from the server.

app/common/UserConfig.ts

@@ -2,7 +2,6 @@
  * Interface for the user's config found in config.json.
  */
 export interface UserConfig {
-  enableMetrics?: boolean;
   docListSortBy?: string;
   docListSortDir?: number;
   features?: ISupportedFeatures;