in_opentelemetry: support tag_from_uri

Signed-off-by: Takahiro Yamashita <[email protected]>

Author: nokute78

plugins/in_opentelemetry/opentelemetry.c

@@ -169,6 +169,11 @@ static struct flb_config_map config_map[] = {
      0, FLB_TRUE, offsetof(struct flb_opentelemetry, tag_key),
      ""
     },
+    {
+     FLB_CONFIG_MAP_BOOL, "tag_from_uri", "true",
+     0, FLB_TRUE, offsetof(struct flb_opentelemetry, tag_from_uri),
+     "If true, tag will be created from uri. e.g. v1_metrics from /v1/metrics ."
+    },
     {
      FLB_CONFIG_MAP_INT, "successful_response_code", "201",
      0, FLB_TRUE, offsetof(struct flb_opentelemetry, successful_response_code),

plugins/in_opentelemetry/opentelemetry.h

@@ -35,6 +35,7 @@ struct flb_opentelemetry {
     flb_sds_t tcp_port;
     const char *tag_key;
     bool raw_traces;
+    int  tag_from_uri;
 
     size_t buffer_max_size;            /* Maximum buffer size */
     size_t buffer_chunk_size;          /* Chunk allocation size */

plugins/in_opentelemetry/opentelemetry_prot.c

@@ -1578,8 +1578,8 @@ int opentelemetry_prot_handle(struct flb_opentelemetry *ctx, struct http_conn *c
     /* Compose the query string using the URI */
     len = strlen(uri);
 
-    if (len == 1) {
-        tag = NULL; /* use default tag */
+    if (ctx->tag_from_uri != FLB_TRUE) {
+        tag = flb_sds_create(ctx->ins->tag);
     }
     else {
         tag = flb_sds_create_size(len);